<section><h2><h2><h1 data-pm-slice="1 1 []">The U.S. Auto Tech National Championship Driven to Win</h1></h2></h2><p><p data-pm-slice="1 1 []">The Driven to Win quiz is your chance to qualify for the 2023 U.S. Auto Tech National Championship. It is a fast-paced five-minute digital challenge that will test you on overall vehicle knowledge. The highest scores from this month's quiz will advance to the next round of the competition, the Round of 64.</p><p data-pm-slice="1 1 []"> </p><p data-pm-slice="1 1 []">You are limited to one quiz attempt per day, and you will not be able to go back to a question once you've submitted your answer. </p></p></section><section><h2><h2><h2><strong>How is heat transfer by convection accomplished?</strong></h2></h2></h2></section><section><h3><h2><h2><strong>The metric term for pressure (psi) is:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says convection is the process of heat moving to cold. Technician B says convection also involves the movement of heat upward. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>On an OHV engine, rocker arms are:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Most bolts in today's engines are referred to as "torque to yield" which means they can be re-used a maximum of how many times?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>When load testing a battery, the voltage should never drop below:</strong></h2></h2></h3></section><section><h3><h2><h2>A car comes into the shop with a loud popping noise or back fire through the intake on acceleration. Testing reveals that the problem is not electrical. Compression tests show normal compression in all cylinders. Technician A says an exhaust lobe is likely worn on the camshaft. Technician B says an intake lobe is likely worn on the camshaft. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>The TPMS (Tire Pressure Monitor Sys.) needs to be relearned after all of the following procedures except:</h2></h2></h3></section><section><h3><h2><h2>When making a wiring repair outside the vehicle you should:</h2></h2></h3></section><section><h3><h2><h2>A voltage drop test measures the amount of:</h2></h2></h3></section><section><h3><h2><h2>Ohm’s is a measurement of electrical:</h2></h2></h3></section><section><h3><h2><h2>Voltage is the measurement of electrical:</h2></h2></h3></section><section><h3><h2><h2>Amperage is the measurement of electrical:</h2></h2></h3></section><section><h3><h2><h2>High impedance volt meter has:</h2></h2></h3></section><section><h3><h2><h2>Technician A says as long as the dog (clutch) teeth of the synchronizer blocker ring are round, the synchronizer can be reused. Technician B says that they synchronizer sleeve should slide smoothly on its splines. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says the annular groove is on the outside of a synchronizer sleeve. Technician B says the annular groove directs oil to the counter shaft bearings. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A states that a fixed CV joint is the most common inner joint on half shafts. Technician B states that a plunging CV joint is the most common outer joint on half shafts.</h2></h2></h3></section><section><h3><h2><h2>If a can of DOT 3 or DOT 4 is left open, the brake fluid will:</h2></h2></h3></section><section><h3><h2><h2>A vehicle is making a whirring noise when idling in neutral with the clutch pedal released. When the clutch pedal is depressed, the noise stops. Technician A says the most likely cause is a bad transmission input shaft bearing. Technician B says the problem is a faulty pilot bearing. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says excessive clutch free travel can indicate an excessively worn clutch disc. Technician B says clutch problems can often be corrected by properly adjusting the clutch linkage. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says when installing a clutch disc, the splines of the disc should be clean, but never oiled or greased. Technician B says the disc should always be installed with its hub and springs toward the engine. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>What is the purpose of VVT (Variable Valve Timing) in an engine?</h2></h2></h3></section><section><h3><h2><h2>What is the difference, of the braking surfaces, between the Primary and Secondary shoes?</h2></h2></h3></section><section><h3><h2><h2>To check rotor parallelism, you would use a:</h2></h2></h3></section><section><h3><h2><h2>Technician A says that fixed calipers have only one piston. Technician B says that floating calipers have at least two pistons. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that a "Hydro boost" brake system is operated by pressure from the power steering pump. Technician B says that "Hydro boost" brake system is operated by engine vacuum. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Which valve is always the bigger of the two, intake or exhaust?</h2></h2></h3></section><section><h3><h2><h2>Technician A says: That cylinder wear is greatest at the bottom of ring travel. Technician B says: That cylinder wear is greatest at the middle of ring travel. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>On a basic DI ignition system, the time the coil is energized to build the magnetic field in the primary winding is called?</h2></h2></h3></section><section><h3><h2><h2>Testing of a Hall Effect switch can be done by:</h2></h2></h3></section><section><h3><h2><h2>While discussing waste spark ignition, Technician A says there are two spark plugs connected in series. Technician B says the two spark plugs are in companion cylinders that are at TDC at the same time. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>The Check Engine Light is flashing and indicates a potential catalyst damage fault. What does this mean?</h2></h2></h3></section><section><h3><h2><h2>On many Pending type codes, what must happen to illuminate the MIL?</h2></h2></h3></section><section><h3><h2><h2>On an OBD II vehicle the short term fuel trim and long term fuel trim values are both at 22% at idle. The short term fuel trim and long term fuel trim values are both at 12% at 2500 rpm. What is the most likely cause?</h2></h2></h3></section><section><h3><h2><h2>On a vehicle with an Active Fuel Management System the computer controls an oil control solenoid that results in?</h2></h2></h3></section><section><h3><h2><h2>The valve body in a rear wheel drive transmission is being cleaned and inspected. Technician A says to clean the valves in mineral spirits and dry them with a lint free cloth. Technician B says to lightly sand the lands of the valves with emery cloth to be sure that all of the gouges are removed. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>The valve body for a 47RE has just been disassembled, cleaned, and inspected. What are the two adjustments that need to be made on the valve body before reinstallation?</h2></h2></h3></section><section><h3><h2><h2>What type of pump is the GM 4L60 transmission equipped with?</h2></h2></h3></section><section><h3><h2><h2>Technician A says when assembling parts of a transmission, especially a valve body, to always use the proper gaskets and seals and lubricate each part with clean ATF. Technician B says to increase the torque value for each fastener by 15% when reusing bolts and other fasteners. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says when an external gear drives another external gear, the output will always be in the opposite direction to the input gear. Technician B says when an external gear drives another external gear the output is in the same direction as the input. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that a hybrid electric vehicle uses a power split device inside what may be referred to as the hybrid transaxle. Technician B says the hybrid transaxle functions as a continuously variable transmission. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says engine heat is a product of combustion. Technician B says an engine releases heat through the process of convection. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>All of the following statements about engine cooling are true except:</h2></h2></h3></section><section><h3><h2><h2>After a vehicle has been driven for 10-15 miles, the heater still continues to blow cool air even though the engine is at normal operating temperature. Which of the following is the most likely cause?</h2></h2></h3></section><section><h3><h2><h2>Technician A says a defective radiator cap vacuum valve may cause hoses to collapse. Technician B says a defective pressure valve may cause coolant boil over and loss. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>If a thermostat fails in the open position, all of the following will occur except:</h2></h2></h3></section><section><h3><h2><h2>All of the following conditions could cause an engine coolant loss except:</h2></h2></h3></section><section><h3><h2><h2>A vehicle is in for service with a complaint of poor heat output. The technician finds air trapped in the heater core. What is the most likely cause of this condition?</h2></h2></h3></section><section><h3><h2><h2>An engine coolant temperature switch or air conditioner select switch is used to energize the</h2></h2></h3></section><section><h3><h2><h2>Technician A says one purpose of a thermostat is to cause the engine to warm up as soon as possible. Technician B says the thermostat should be removed from the cooling system only if the engine is overheating. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>When making system repairs, install the receiver-drier or accumulator:</h2></h2></h3></section><section><h3><h2><h2>An air conditioning system should be pumped down (evacuated) for a minimum of __________ minutes according to MACS.</h2></h2></h3></section><section><h3><h2><h2>At highway speed, the A/C system cools normally, but poorly during around town stop and go driving. What is the most likely case of this condition?</h2></h2></h3></section><section><h3><h2><h2>Which of the following is NOT a symptom of an overcharged air conditioning system?</h2></h2></h3></section><section><h3><h2><h2>An inoperative cooling fan may cause high head (high-side) pressure at what vehicle speeds?</h2></h2></h3></section><section><h3><h2><h2>A technician determined that all the refrigerant had leaked out of the A/C system. Technician A says that the low-pressure switch will need to be replaced before the system can be recharged. Technician B says that the low pressure switch will need to be adjusted before the system can be recharged. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that the A/C system may be charged through the LOW side when the system is operating. Technician B says that the A/C system may be charged through the HIGH side when the system is off. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A technician is checking the evaporator for leaks on an R-134a refrigerant system. Technician A says that it is acceptable to use shop air to pressurize the system and use an electronic microphone to listen for leakage. Technician B says that it is acceptable to charge the system with R-134a and then insert the electronic leak detector probe in the evaporator drain. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Refrigerant analyzers or identifiers are being discussed. Technician A says the identifier/analyzer will identify the type of refrigerant as well as the purity. Technician B says if "HC" is displayed, then the refrigerant is flammable. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Charging the system is being discussed. Technician A says the refrigerant must be weighed (or metered) to obtain a proper charge. Technician B says overcharging the system will reduce its cooling efficiency. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says there is a direct relationship between the pressure and temperature of a refrigerant. Technician B says any apparent temperature-pressure relationships in a contaminated system is not valid. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A manifold and gauge set is attached to an operating air conditioner. The low-side gauge reading is too high and the high-side reading is too low. What could be the problem?</h2></h2></h3></section><section><h3><h2><h2>Most original equipment manufacturers use what type of lubricant in their R-134a systems?</h2></h2></h3></section><section><h3><h2><h2>Which of the following could cause very low pressures on the low side of a system equipped with an expansion valve?</h2></h2></h3></section><section><h3><h2><h2>An undercharged system will show which of the following gauge readings?</h2></h2></h3></section><section><h3><h2><h2>Technician A says a four-speed blower motor will have 3 resistors. Technician B says all blower motors have windings in the motor to control blower speed. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Which of the following is not a symptom of an overcharged air conditioning system?</h2></h2></h3></section><section><h3><h2><h2>Technician A says the purpose of the low pressure cycling switch is evaporator temperature control. Technician B says the purpose of the pressure relief switch is system protection. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that the electronic leak detector probe should be held directly against a suspected leak area during a leak test. Technician B says that the electronic leak detector requires routine probe tip inspection and maintenance. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A technician determined that all the refrigerant had leaked out of the A/C system. Technician A says that the low-pressure switch will need to be replaced before the system can be recharged. Technician B says that the low pressure switch will need to be adjusted before the system can be recharged. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says an AC generator cannot produce current until battery current flows through the stator windings. Technician B says an AC generator cannot produce current until battery current flows through the field coil of the rotor. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Charging system indicator lamp operation is being discussed: Technician A says in a charging system with an electronic regulator, the lamp will illuminate if there is no stator output through the diode trio. Technician B says if there is stator output, the lamp circuit has power applied to both sides of the lamp and it will not illuminate. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Which of the following could possibly cause a battery to be undercharged?</h2></h2></h3></section><section><h3><h2><h2>A technician is checking the charging system for low output. A voltage drop of 1.67 volts is found between the generator output terminal and the battery positive terminal. Technician A says that a corroded connector could be the cause. Technician B says that a defective rectifier diode could be the cause of the voltage drop. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>If a stator has 3 windings, how many diodes (positive and negative) will the rectifier have?</h2></h2></h3></section><section><h3><h2><h2>Technician A says a fully charged lead acid battery contains plates made of lead dioxide and lead sulfate. Technician B says a fully charged lead acid battery contains plates made of lead sulfate and sponge lead. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says the plates of a completely discharged battery are two similar metals in the presence of water. Technician B says the plates of a completely discharged battery are two dissimilar metals in the presence of an electrolyte. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Ice crystals are found in the electrolyte: Technician A says this indicates the battery is discharged. Technician B says the battery can be safely jumped. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says connecting battery cables in reverse polarity can damage many of the vehicle's computer systems. Technician B says the battery must be secured in the vehicle to prevent damage and the possibility of shorting across the terminals if it tips. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says maintenance-free batteries do not need additional water. Technician B says maintenance-free batteries have a small valve to relieve gas pressure. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A customer's battery is always dead when she attempts to start her car in the morning. After jumping the battery one time in the morning, the car will start throughout the day with no problems: Technician A says the starter motor may be drawing too much current. Technician B says there may be a glove box light staying on. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says there are electrical demands placed on the battery with the ignition switch turned off. Technician B says after the engine is started, the vehicle's charging system works to recharge the battery and provides current to run the vehicle’s electrical systems. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>The current capacity rating of the battery is being discussed: Technician A says the amount of electrical energy a battery is capable of producing depends on the size, weight, and active area of the plates. Technician B says the current capacity rating of the battery depends on the types of materials used in the construction of the battery. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says the largest demand placed on the battery is when it must supply current to operate the starter motor. Technician B says current requirements of a starter motor may be over several hundred amperes. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>All of the following sensors produce their own voltage except:</h2></h2></h3></section><section><h3><h2><h2>When looking at a MAF sensor pattern on an oscilloscope which of the following are true?</h2></h2></h3></section><section><h3><h2><h2>An oscilloscope does all of the following except?</h2></h2></h3></section><section><h3><h2><h2>Technician A says a hall-effect sensor produces an analog signal. Technician B says a halleffect sensor produces a digital signal. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says when testing the magnetic pulse generator, a DMM may be used to test the resistance value of the coil. Technician B says a DMM may be used to measure AC voltage across the sensors terminals. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A MIRE sensor is being discussed. Technician A says the MIRE’s reluctor wheel has both north and south poles on it. Technician B says the MIRE gives off a digital signal? Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Electrically erasable PROM (EEPROM) is designed so the information is erasable and a manufacture’s scan tool can update the information.</h2></h2></h3></section><section><h3><h2><h2>Technician A says nonvolatile RAM will lose its memory if removed from its power source. Technician B says volatile RAM is not erased when it is disconnected from its power source. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A ground is always an output.</h2></h2></h3></section><section><h3><h2><h2>Which of the following determines the power of a computer?</h2></h2></h3></section><section><h3><h2><h2>Technician A says a central processing unit and a microprocessor are the same thing. Technician B says the computers clock determines how fast information will be processed. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Which of the following is an actuator?</h2></h2></h3></section><section><h3><h2><h2>Which of the following is not one of the main functions of a computer?</h2></h2></h3></section><section><h3><h2><h2>Duty cycle is the amount of time something is on.</h2></h2></h3></section><section><h3><h2><h2>Pulse width is percentage of time something is on.</h2></h2></h3></section><section><h3><h2><h2>Frequency is the number of events that happen in a time period.</h2></h2></h3></section><section><h3><h2><h2>Technician A says programs are sometimes displayed in a pictorial format or a graph so adjustments can easily be seen. Technician B says hertz is the unit of measurement for frequency. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A driver circuit is used to turn on a component.</h2></h2></h3></section><section><h3><h2><h2>Programmable read only memory is designed to be changed repeatedly.</h2></h2></h3></section><section><h3><h2><h2>Programmable read only memory contains specific data that pertains to the exact vehicle in which the computer is installed.</h2></h2></h3></section><section><h3><h2><h2>Resistive multiplexing could be used in all of the following except:</h2></h2></h3></section><section><h3><h2><h2>Bluetooth technology allows devices from different manufacturers to be connected using a standardized wireless transmission.</h2></h2></h3></section><section><h3><h2><h2>The Media Oriented System Transport (MOST) cooperation data bus system uses fiber optics to transmit data.</h2></h2></h3></section><section><h3><h2><h2>Controller Area Network (CAN) diagnostics is being discussed. Technician A says the CAN “A” bus is used for low speed communications. Technician B says the CAN “B” bus may be active when the ignition is off. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Controller Area Network (CAN) is being discussed. Technician A says the CAN system uses analog signals for its multiplexing communication. Technician B says the CAN system uses digital signals for its multiplexing communication. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says modules on the Media Oriented System Transport (MOST) data bus use an LED, photodiode, and a transceiver to communicate. Technician B says the Media Oriented System Transport (MOST) system uses fiber optics to transmit data at a slow baud rate. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>The term “Valve overlap” refers to:</h2></h2></h3></section><section><h3><h2><h2>Technician<em> </em>A says that the intake valve always opens at exactly TDC on the exhaust stroke. Technician<em> </em>B says that valve overlap creates a scavenging effect. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A<em> </em>says the piston must be at the top dead center of the compression stroke when performing a cylinder leakage test. Technician B says a head gasket is leaking if the air escapes from the throttle body during a cylinder leakage test. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Intake manifold vacuum is highest during what operating condition?</h2></h2></h3></section><section><h3><h2><h2>Which of the following represents the correct sequence of the 4-stroke cycle?</h2></h2></h3></section><section><h3><h2><h2>The OBD II electronic AIR system pumps air into the:</h2></h2></h3></section><section><h3><h2><h2>Technician A says OEM active intake manifolds are designed to increase air velocity for low RPM performance. Technician B says OEM active intake manifolds are designed to increase air volume for high RPM performance. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>While evaluating a cylinder leakage test, Technician A says if the air escapes from the tailpipe, an intake valve is leaking.<em> </em>Technician B says the piston must be at TDC on the exhaust stroke when performing the cylinder leakage test. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Two technicians were discussing the exhaust system. Technician A says that a rattling noise when the engine is accelerated can be caused by loose internal components in the muffler. Technician B says that a lack of engine power can be caused by a restricted exhaust system. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that the exhaust is routed past the compressor wheel of the turbocharger. Technician B says that the supercharger can use an intercooler. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A<em> </em>says that computer feedback is information sent back to the computer to confirm that a command was carried out by an actuator. Technician B<em> </em>says that feedback can also be in the form of a monitored voltage signal to a switch or relay. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says a 10W-30 oil pours more easily than a straight 5W-20 oil at 32<sup>o</sup> F. Technician B says synthetic oil has improved stability over a wider temperature range compared to a conventional oil. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Short-term fuel trim (STFT) adds or subtracts fuel to correct for</h2></h2></h3></section><section><h3><h2><h2>An O2 sensor may be used to monitor the:</h2></h2></h3></section><section><h3><h2><h2>All of the following are PCM actuators except:</h2></h2></h3></section><section><h3><h2><h2>Technician A says pulse width modulation is the duration of on time, but not connected to a specific cycle time. Technician B says duty cycle is measured in percentages. Who is correct?</h2></h2></h3></section><section><h3><h2>Technician A says that if the engine rpm is stable, the scan tool should show a fluctuating MAF reading. Technician B says that the MAF sensor can be a frequency-producing sensor. Who is correct?</h2></h3></section><section><h3><h2><h2>Technician A says fuel pumps can be checked for amperage draw and for a current waveform. Technician B says a low amp clamp is connected in series with the circuit being tested. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that duty cycle is a percentage of time in a fixed cycle that a device is “On”. Technician B says that if a full cycle were 1 second in length, a 50 percent duty cycle means that the device was “On” for 0.5 second. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that long-term fuel trim is constantly changing for driving conditions. Technician B says that the PCM can add or subtract about 10 percent of the base fuel trim before setting a trouble code. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>The octane rating of the fuel will determine which of the following?</h2></h2></h3></section><section><h3><h2><h2>The PCM uses the throttle position sensor to monitor the:</h2></h2></h3></section><section><h3><h2><h2>The EVAP system is designed to reduce which emission?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that the oxygen sensor produces a high-voltage signal when the exhaust is lean. Technician B says that the oxygen sensor produces a low-voltage signal when the exhaust is rich. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>To help isolate a clogged or dirty injector:</h2></h2></h3></section><section><h3><h2><h2>Technician A says low fuel pressure may be caused by a restricted fuel filter. Technician B says when testing fuel pressure make sure the specifications are either for the engine running or the engine off. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>What is a main advantage of GDI systems?</h2></h2></h3></section><section><h3><h2><h2>Which of the following fuel systems can have fuel pressure of over 1500 psi?</h2></h2></h3></section><section><h3><h2><h2>Technician A says an injector ohm test is the most accurate method of testing a fuel injector’s operation. Technician B says an injector ohm test can only confirm a defective injector winding. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>While discussing DFI fuel injection systems, Technician A says that DFI systems have a low-pressure fuel system. Technician B says that DFI systems have a high-pressure fuel system. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that when conditions such as starting or wide-open throttle demand that the signals from the oxygen sensor be ignored, the system operates in open loop. Technician B says that when the PCM is using feedback from the oxygen sensor to control fuel injection, it is in closed loop. Who is correct?</h2></h2></h3></section><section><h3><h2>Technician A says that most port fuel injection systems supply the injectors a full battery voltage. Technician B says that the port fuel injector ground wire is routed to the PCM. Who is correct?</h2></h3></section><section><h3><h2><h2>Technician A says one component of the secondary ignition circuit is the ignition coil. Technician B says the ignition coil is a component in the primary ignition circuit. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>For maximum engine power to be obtained, maximum cylinder pressure should occur:</h2></h2></h3></section><section><h3><h2><h2>Which of the following represents the amount of voltage necessary to sustain the spark across the spark plug gap?</h2></h2></h3></section><section><h3><h2><h2>Technician A says as engine speed slows, the timing should be retarded or have less advance. Technician B says typically, the more load on an engine, the less spark advance is needed. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>The time during which current flows through the primary coil winding is called:</h2></h2></h3></section><section><h3><h2><h2>A vehicle has a no-spark condition on a waste spark ignition system. Technician A says the crankshaft position sensor may need to be replaced. Technician B says the ignition module could be faulty. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>All of the following are advantages of EI systems except:</h2></h2></h3></section><section><h3><h2><h2>The EGR valve works by recirculating a portion of the exhaust gases back into the intake manifold. This results in:</h2></h2></h3></section><section><h3><h2><h2>Natural gas is composed primarily of:</h2></h2></h3></section><section><h3><h2><h2>While discussing waste spark ignition, Technician<em> A</em> says that there are two spark plugs connected in series. Technician B says that the two spark plugs are in companion cylinders that are at TDC at the same time. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>While discussing the diagnosis of an EI system, Technician A says that the coil primary normally has between 5,000 and 20,000 ohms. Technician B says that the coil secondary normally has less than 2 ohms. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that some coil on plug systems have an ignition module that is part of the PCM. Technician B says that some coil on plug ignition systems have a separate ignition module built into each coil assembly. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>While discussing EVAP valves, Technician A says the evaporative emissions system must be able to detect a leak as small as 0.020 inches in size. Technician B says that the monitor for the EVAP system works by closing the purge and vent valves and watching to see if the tank pressure increases. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that if the PCM is correcting for a lean condition, the long-term FT will indicate a negative number. Technician B says that a rich condition causes the long-term FT to show a positive number. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says propane is heavier than natural gas. Technician B says natural gas is lighter than air. Who is correct?</h2></h2></h3></section><section><h3><h2>Technician A says the major drawback to most alternative fuels is fuel storage. Technician B says the major drawback is the increase in emissions. Who is correct?</h2></h3></section><section><h3><h2><h2>Technician A says CNG, LNG, Propane have no evaporative emissions. Technician B says E85, M85 and gasoline have no evaporative emissions. Who is Correct?</h2></h2></h3></section><section><h3><h2>Technician A says “Raw” vegetable oil is not a certified fuel for Highway use. Technician B says Bio-Diesel is a certified fuel and it is tested for Highway use. Who is correct?</h2></h3></section><section><h3><h2><h2>What is the Chemical added to CNG and Propane for an odorant?</h2></h2></h3></section><section><h3><h2>Flexible fuel vehicles can operate on which fuel?</h2></h3></section><section><h3><h2>Which contaminate is found in CNG that causes operating problems?</h2></h3></section><section><h3><h2>Bio-diesel contains little or no toxins and quickly bio degrades when spilled on the ground or in the water.</h2></h3></section><section><h3><h2><h2>The auto ignition temperature of methane (Natural gas) is about _________ as high as that of gasoline.</h2></h2></h3></section><section><h3><h2>Technician A says CNG is the preferred method of natural gas storage on light-duty vehicles. Technician B says LNG is the preferred method of storage on light-duty vehicles. Who is correct?</h2></h3></section><section><h3><h2><h2>All are true about the A.S.M.E. Propane tank except:</h2></h2></h3></section><section><h3><h2><h2>Technician A says that a hoop-wrapped cylinder has a thicker metal liner than a full-wrapped cylinder. Technician B says that on an all-composite cylinder the thin plastic liner carries the full pressure load of the cylinder. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>While discussing CNG (NGVII) cylinder inspection, Technician A says that a Detailed Visual Inspection should be performed every 36,000 miles by a technician. Technician B says NGV II standards require an inspection every 3 years by a certified cylinder Inspector. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>All of the following are true except:</h2></h2></h3></section><section><h3><h2><h2>LPG fuel tanks shall be securely mounted to withstand static load in any direction equal to four times the weight of the container filled with fuel.</h2></h2></h3></section><section><h3><h2><h2>Technician A says LPG tanks do not use pressure relief devices. Technician B says all PRD are not adjustable. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says LPG system must have a ¼ turn shut off valve. Technician B says CNG system must have a ¼ turn shut off valve or an electric lock-off. Who is correct? </h2></h2></h3></section><section><h3><h2><h2>Technician A says LPG tanks can be used for CNG in an emergency. Technician B says CNG tanks can be used for LPG at any time. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says it is okay to weld on a CNG cylinder to mount a bracket. Technician B says it is safe to drill into a LPG tank to attach a pressure gauge. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says on a propane vehicle the Max. Liquid Gauge can be used for filling. Technician B says on a CNG vehicle a Max. Liquid Gauge is not used. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says it is okay to paint LPG Cylinders, which will be mounted outside the vehicle, black. Technician B says black paint (if tank was painted) will cause too much venting. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A technician notices that a CNG cylinder is loose in its brackets due to a missing rubber insulator. Technician A replaces the rubber insulator and delivers the vehicle to the customer. Technician B says that a certified cylinder inspector is to be contacted to make sure there is no damage to the cylinder. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>While discussing propane tanks, Technician A says the pressure relief valve is internally mounted. Technician B says the pressure relief valve is externally mounted. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>A vehicle is being converted to propane; Technician A says that NFPA 52 manual should be consulted during this conversion. Technician B says that the NFPA 58 manual should be consulted during this conversion. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Installation of a propane tank is being discussed. Technician A says to install the tank any place it fits. Technician B says the lowest part of the tank should not be lower than the lowest point on the vehicle. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>The vent or vents for the venting system shall not exit into a wheel well.</h2></h2></h3></section><section><h3><h2><h2>Technician A says the venting of gas through a fixed maximum liquid level gauge during filling shall not be required when the engine fuel container being fueled is equipped with an overfilling prevention device. Technician B says although this may be true some filling stations refuse to fill vehicles using the Max. Liquid Level Bleed Valve because of the low level emission law. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>LPG regulators are being discussed. Technician A says engine coolant is used to prevent freezing inside the vaporizer. Technician B says exhaust gases was used in older regulators and should not be used in coolant type regulators. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>CNG fuel lines are being discussed. Technician A says pipe, tubing, fittings, and other piping components shall be designed with a pressure rating. Technician B says a pressure gauge, if provided, shall be capable of reading at least 1.2 times the system design pressure. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Shields on CNG tanks are being discussed. Technician A says there should be no direct contact between the shield and the CNG tank. Technician B says using a metal shield as a protective device under the clamps is acceptable. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says CNG fuel lines may be repaired if damaged. Technician B says the damaged line must be replaced by a certified technician and leak tested. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>CNG electronic shut off valves are being discussed. Technician A says only normally closed valves may be used. Technician B says normally open or normally closed may be used depending on application. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says EPA regulations cover all 50 states. Technician B says CARB regulations cover all 50 states but are more stringent regulations. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says EPA regulations require a warranty on all aftermarket conversions. Technician B says EPA regulations require an emissions test before an aftermarket conversion can be certified. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says on a CNG, Bi-fuel vehicle, the operator is able to switch fuels while driving down the road no matter what condition. Technician B says the Alt. Fuel ECM automatically switches to gasoline when the vehicle is low on natural gas. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says the regulator delivers fuel to the metering device. Technician B says the CNG single stage regulator delivers fuel to the spray nozzle. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says the IAT (Intake Air temperature) sensor is used to calculate air density. Technician B says the MAP (manifold absolute pressure) sensor is a pressure transducer that converts pressure to voltage through a piezo-resistive element. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says the FRT (fuel rail temperature) sensor measures temperature for fuel density. Technician B says the FRT is a pressure sensor that is used to calculate fuel density. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says a CNG injection system uses a single stage regulator. Technician B says the CNG single stage regulator is a high-pressure regulator that reduces pressure to 100 psi. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>All of the following statements concerning the Toyota Hybrid Systems (THS) are true except it:</h2></h2></h3></section><section><h3><h2><h2>Two technicians are discussing the benefits of the Electric Motor Power Steering System (EMPS). Technician A says that EMPS does not require that the engine be running to provide steering assist. Technician B says that EMPS produces better fuel economy than conventional hydraulic power steering because it is lighter in weight and uses energy only when steering assist is required. Who is correct?</h2></h2></h3></section><section><h3><h2><h2>All of the following components are contained in the P111 Transaxle except:</h2></h2></h3></section><section><h3><h2><h2>During initial take-off under very light acceleration, which of the following THS components is the primary power source that drives the wheels?</h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that most wheel speed sensors are permanent magnet types. Technician B says that some Hall-effect wheel speed sensor is used in some ABS. Who is right?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that a wheel speed sensor’s voltage output does not change with the speed of wheel rotation. Technician B says that a wheel speed sensor’s frequency changes with the speed of wheel rotation. Who is right?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The amber (yellow) brake warning light is on. Technician A says that there is an ABS failure and the ABS is deactivated. Technician B says that this can be due to low fluid level in one-half of the master cylinder. Who is right?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>A left front wheel locks up during an ABS stop. Technician A says that if the blocking solenoid for the left front brake is energized, the master cylinder is isolated from the left front wheel cylinder. Technician B says that if the dump solenoid opens, normal braking will be reestablished. Who is right?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>In a traction control system, the engine’s power output can be controlled by:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that most wheels have a drop center or deep well that is used in installing a tire on the wheel. Technician B says that the drop center or deep well is used to prevent the tire from coming off the wheel in the case of low tire pressure. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that the use of nitrogen to fill a tire will prevent the tire from blowing out. Technician B says that when mounting or dismounting a tire on a wheel with a TPMS sensor, you need to position the wheel/tire properly on the tire machine or the TPMS sensor can be easily broken. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that the steering column used one or more flexible joints to connect to the steering gearbox. Technician B says that the pitman arm is bolted to the frame and relays the steering linkage movement to the opposite wheel from the steering gearbox. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that the clock spring assists the turning of the steering wheel on vehicles with EPS. Technician B says that the clock spring is used to transmit an electrical signal to the driver’s side airbag. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that when the vehicle is being driven straight ahead, a belt-driven power steering pump will pump fluid continuously, placing a minimal load on the engine. Technician B says that a belt-driven power steering pump is activated by an electro-magnetic clutch, so it only pumps fluid when the wheels are being steered. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that thrust angle refers to the direction the front wheels are pointing. Technician B says that scrub radius refers to the vertical centerline of the tire in relation to an imaginary line through the steering knuckle pivots. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that a vehicle will tend to pull toward the side with the most positive camber. Technician B says that a progressive-rate spring offers a soft ride but can also carry a heavier load. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that positive toe is when the front of the tires are farther apart than the rear of the tires. Technician B says that a ball joint in a MacPherson strut suspension is a follower joint (not loaded). Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that the front wheels should be aligned before the rear wheels. Technician B says that front wheel tow should be adjusted after front wheel camber and caster. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that regenerative braking converts brake heat into electricity. Technician B says that regenerative braking converts electrical energy into braking energy. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that a brake-by-wire system can start to apply brakes before the driver can step on the brake pedal. Technician B says that brake-by-wire systems use heavy cables to transmit the brake pedal force to the wheel brake units. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that kinetic energy is created during braking to stop the vehicle. Technician B says that kinetic energy is converted to heat energy during braking. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that brake fluid should periodically be checked for excessive moisture content. Technician B says that brake fluid should be replaced every 12,000 miles. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that rotors should be measured for thickness variation (parallelism). Technician B says that rotors should be measured for lateral runout. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that rotors that are too thin cannot handle as much heat and will experience brake fade sooner. Technician B says that brake pedal pulsation is the result of air in the hydraulic system. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that a micrometer is used to measure rotor thickness variation. Technician B says that a micrometer is used to measure rotor lateral runout. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that duo-servo brake shoes are only anchored on the top. Technician B says that typically duo-servo brake shoes adjust automatically during normal brake applications in a forward direction. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that when performing a brake job on the rear axle of an older vehicle, inspection finds brake fluid under the dust boot; this suggests wheel cylinder replacement on both rear wheels. Technician B says that when a drum brake return spring has failed, springs on both rear wheels need to be replaced. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that during anti-lock braking, brake fluid may be returned to the master cylinder. Technician B says that solenoid valves in the hydraulic control unit will isolate the master cylinder from the brake circuit when it is in the “hold” mode. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that mismatched tires may cause the ABS system to register a fault code. Technician B says that a traction control system may automatically apply brake pressure to a wheel brake unit even if the vehicle is not being braked. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that a yaw sensor tells the computer the vehicle’s actual direction. Technician B says that raising a vehicle’s curb height has no effect on the electronic stability control system. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that a scan tool may be required to bleed air from the ABS brake system. Technician B says that some vehicles have a high-pressure accumulator that may need to have the pressure bled off before hydraulic brake repairs are made. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that some ABS wheel speed sensors create a square wave digital pattern. Technician B says that some wheel speed sensors create an AC sine wave pattern. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following statements is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Choose the correct statement:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which alignment angle is adjustable on all vehicles?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of these alignment angles determines the thrust angle?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which alignment angle is defined as the inward or outward movement of the wheel at the top when viewed from the front of the vehicle?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that the relationship between the centerline of the vehicle and the angle of the rear tires is known as the thrust line. Technician B says that the thrust line is the direction in which the front wheels are pointing. Who is right?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The condition in which the front of the wheels are closer together than the rear of the wheels, as viewed from the front of the vehicle, is called:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The Ackermann principle is applied in steering geometry to:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following components transfers the motion to the tie rod in a rack-and-pinion steering system?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>In modern computer-controlled four-wheel steering, an actuator similar to a front rack-and-pinion assembly attaches to the rear steering knuckles with:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following electric power assist steering systems has the power assist unit, controller, and torque sensor connected to the steering column?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that steering geometry is the dimensional relationship between the steering and suspension components. Technician B says that steering geometry is designed to keep the wheels oriented in the same direction in various road conditions. Who is right?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>When a vehicle has negative caster:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The angle formed by the upper and lower control arms and which is determined by the intersection of the control arm’s centerlines is known as:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>RWAL and RABS systems use:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says some Speed sensors produce A/C voltage. Technician B says you can check speed sensors with a digital multi-meter. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>On 3 circuit 4 sensor rear wheels are controlled using a principle called:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says some front wheel speed sensors have an adjustable air gap. Technician B says rear wheel speed sensors may be adjustable or non-adjustable. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>A combination hold/dump valve with spring loaded accumulator is used in:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>A stop made under a condition of 100% negative wheel slip results in:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says the GM RWAL system can be recalibrated to accommodate a change in tire size or axle ratio. Technician B says changing tire size has no affect on ABS. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following valves close to block fluid in the Hydraulic Control Unit?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>What component controls fluid pressure applied to each wheel brake during antilock stop?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>What type of signal does a Magnetic Pulse Generator Wheel Speed Sensor transmit?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>On a car with single piston floating caliper disc brakes, the disc brake pad on the outside of the caliper is badly worn. The other brake pad is slightly worn. Technician A says that too much rotor run out could be the cause. Technician B says that binding caliper slides could be the cause. Who could be correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Front wheel drive autos use what type of hydraulic split-braking system?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says warped rotors can result from excessive heat. Technician B says that warped rotors can result from improperly torqued lug nuts. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The maximum allowable thickness variation of the rotor (parallelism) usually is about:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The pressure differential switch will do what?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Brake fluid is susceptible to contamination by water. This is called:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The pressure at which a proportioning valve begins to limit pressure to the rear brakes is called the?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>During normal brake system operation what moves the secondary piston of the master cylinder?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>While being held, the brake pedal moves down slightly when the engine is started. Technician A says that the cause could be a leaking power brake booster diaphragm. Technician B says that the cause could be a stuck closed power brake booster manifold check valve. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that a “Hydroboost” brake system can be operated by pressure from the power steering pump. Technician B says that a “Hydroboost” system can be operated by an engine vacuum pump. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following could cause a hard brake pedal on a car with power brakes?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that a vacuum booster will provide an assisted brake application after the engine have been shut off. Technician B says that you should be able to blow through a vacuum check valve in one direction only. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>When bleeding the air from a Hydro-boost you should:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Hydraulic brake power boosters:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that silicone brake fluid is hydroscopic. Technician B says that silicone brake fluid will attack and remove paint. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following can cause the brake warning light to come on?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that weak brake shoe hold-down springs can cause rapid lining wear. Technician B says the weak brake shoe return springs can cause rapid lining wear. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Brake shoes are being replaced on a car. Technician A says to lubricate the backing plate ledges. Technician B says to groove the backing plate ledges to match the shoe arc. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The rubber belt wrapped around a brake drum during machining on the lathe is to:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Brake fluid is being added to a master cylinder that has plastic reservoirs. Technician A says to add brake fluid until both reservoirs are within 1/8 inch of the top. Technician B says that heavy-duty brake fluid will dissolve reservoirs. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>A set of good brake linings become soaked with rear axle lubricant. Technician A says that it is okay to wash the lining in solvent and reuse. Technician B says to replace linings on both sides on the same axle. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of these should be used to clean the wheel cylinder bore after honing? </strong></h2></h2></h3></section><section><h3><h2><h2><strong>On a RABS, ABS system it:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>When driving a vehicle with ABS, the amber antilock light comes on. You should:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says when checking out a wheel speed sensor, use a volt meter to check out the D.C. voltage output. Technician B says when checking out an ABS problem, if the amber antilock light is on, it is usually an electrical malfunction. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>To tighten brake line fittings, use:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Other names for step bore master cylinders are:</strong></h2><h2><strong>I. Quick take-up</strong></h2><h2><strong>II. Fast-fill</strong></h2></h2></h3></section><section><h3><h2><h2><strong>All of the following statements concerning the Toyota Hybrid Systems (THS) are true except it:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Two technicians are discussing the benefits of the Electric Motor Power Steering System (EMPS). Technician A says that EMPS does not require that the engine be running to provide steering assist. Technician B says that EMPS produces better fuel economy than conventional hydraulic power steering because it is lighter in weight and uses energy only when steering assist is required. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>All of the following components are contained in the P111 Transaxle except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The 1NZ-FXE engine used in the Prius features all of the following except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Two technicians are discussing the High Voltage (HV) Battery used in the Prius. Technician A says that the HV Battery consists of 38 modules connected in a series circuit. Technician B says that the Service Plug is provided to open the circuit before any repairs are made to a High Voltage circuit. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>During initial take-off under very light acceleration, which of the following THS components is the primary power source that drives the wheels? The:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>All of the following statements concerning the High Voltage circuits contained in the THS system are true except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Two technicians are discussing service of the Prius. Technician A says that no specific safety procedures are required when servicing the Toyota Hybrid System. Technician B says that before beginning service on any High Voltage circuits you should use Repair Manual procedures to disable the high voltage circuits. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Two technicians are discussing the operation of the THS Inverter. Technician A says that the Inverter converts high voltage DC from the HV Battery pack into high voltage AC for the electric motor. Technician B says that the Inverter converts high voltage AC from the generator into high voltage DC for the high-voltage battery pack. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Two technicians are discussing the operation of the THS electric motor. Technician A says that it is a DC permanent magnet motor. Technician B says that a three-phrase alternating current is used to operate the motor. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>All of the following statements about the Inverter cooling system are true except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Two technicians are discussing the operation of the THS transmission. Technician A says that the THS transmission functions as an automatic transmission with continuously variable ratios. Technician B says that the THS uses MG 1 as the control device for the planetary gear set. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following indicator lights is used to inform the driver that the vehicle is ready to be driven? The:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Two technicians are discussing the operation of the output control warning light (“Turtle” light). Technician A says that this warning light indicates that power to the driver wheels may be limited. Technician B says that this warning light indicates that more power is being redirected to recharge the high-voltage battery pack. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following indicator lights is used to inform the driver of a problem in a THS circuit or system?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Two technicians are discussing the THS regenerative braking system. Technician A says that during deceleration or braking, the gasoline engine operates to redirect energy to the high-voltage batter pack. Technician B says that during deceleration or braking, the energy of the moving vehicle is used to generate electricity, which is then stored in the high-voltage batter pack. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The service plug in the Prius is used to:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>All of the following statements are true except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>All of the following components are connected together in the P111 transaxle except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The function of the Resolver in MG 1 and MG 2 is to:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>All of the statements about the DC—DC Converter are true except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The engine will continue to run in all of the following conditions except when:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The EMPS torque sensor performs all of the following except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The Brake ECU controls all of the following except:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>What must be done after replacing the EMPS ECU, steering wheel, or column?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Brake hose diameter is usually specified at the _____ diameter of the hose.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says the metering valve keeps the front disc brakes from operating until the rear drum brakes have started to work. Technician B says the proportioning valve reduces the hydraulic pressure at the rear drum brakes when high pressure is required at the front disc brakes. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says metering valves function only during the initial stages of braking. Technician B says the proportioning valve restricts fluid to the rear wheels, thereby lowering the pressure to help prevent wheel lockup in the rear. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says the brake pedal position sensor is a potentiometer. Technician B say it can inform the BCM that the brake lamps need to be illuminated. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says the pressure differential valve is a hydraulically operated switch that controls the brake failure warning lamp on the instrument panel. Technician B says the pressure differential valve came into use after the advent of ABS braking. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>A brake hose must withstand _____ psi of pressure for 2 minutes without rupturing.</strong></h2></h2></h3></section><section><h3><h2><h2>All of the following may cause the red brake warning light to illuminate <strong>EXCEPT</strong>:</h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says double-wall tubing is made in two ways: seamless and multiple ply. Technician B says that each must meet the specifications of SAE Standard J1047 as amended. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says brake tubing should be double flared or ISO flared. Technician B says ISO tubing seat must be used with the ISO flare. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says a brake hose usually has a fitting that mates to a flare nut on the line. Technician B says a single flare is typical for a brake line. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says all pressure differential valves must be manually re-centered after bleeding. Technician B says a re-centering spring is used on some pressure differential valves. Who is correct.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Electrical wiring repair is being discussed. Technician A says wire size is specified in either the American Wire Gauge (AWG) system or in a metric cross-sectional area. Technician B says the higher the number in AWG the higher the conductor. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says stoplight switches may be single-function or multifunction units. Technician B says the stop lamp switch is normally open, momentary contact switch. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says most late model vehicles are equipped with computer-controlled brake and stop lamp circuits. Technician B says on some vehicles the turn signal and brake lamp switches are inputs to a module that delivers power to the respective bulbs. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that dynamic rear proportioning (DRP) is provided by the Brake Pedal Position (BPP) sensor. Technician B says that dynamic rear proportioning (DRP) is provided by the antilock brake system (ABS). Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>When brakes are first applied and under light braking, the proportioning valve does nothing.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>On an FWD car, 60 percent of the braking is done by the front brakes, so it is desirable to apply them as quickly as possible.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says the first step in road testing for an ABS problem is to check the red brake warning light. Technician B says if the red lamp is lit, the brakes may not be operating properly. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says active brakes can worn the driver of an impending crash. Technician B says active brakes do not actually apply the brakes if necessary of avoid a crash. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Brake bleeding ABS systems are being discussed. Technician A says that some manufacturers state that either pressure bleeding or manual bleeding is acceptable for their various ABS installations. Others specify either one method or the other. Technician B says use only the DOT 3, DOT 4, or synthetic brake fluid specified by the vehicle manufacturer. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says the first code retrieved should be the first repair made. Technician B says the last code in a code series is the first repair since that on was the last set. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says dynamic rear proportioning replaces the old mechanical proportioning valves with ABS action to prevent rear wheel lock up during heavy braking. Technician B says an enhanced traction system can control wheel slippage in some cases by simply reducing the output torque of the engine by reducing engine timing, cutting, cylinders, reducing the throttle opening, or reducing fuel delivery. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The Continental Teves Mk60/Mk70, system has hydraulic brake assist that increases pressure to the brakes whenever a (an) _____ is detected through the brake pedal sensor.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>____________ is the number of times a cycle occurs within one second.</strong></h2></h2></h3></section><section><h3><h2><h2>The DBC-7 ABS provides all of the following <strong>EXCEPT</strong>:</h2></h2></h3></section><section><h3><h2><h2><strong>Magneto-resistive sensors are being discussed. Technician A says these sensors produce an AC voltage signal. Technician B says these sensors are supplied with voltage from the EBCM. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Diagnosing a DBC-7 system is being discussed. Technician A says that the system must be depressurized before retrieving DTC’s. Technician B says that thoroughly inspecting the vehicle and speed sensor harness is one of the first steps in proper diagnosis. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>____________ indicated the amount of time on versus time off.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says tire inflation monitoring is part of the ABS on some vehicles. Technician B says the parking brake is part of the ABS on some vehicles. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says the antilock controller or microprocessor is the computer for the ABS. Technician B says most automotive computers, including the EBCM, are programmed with an adaptive memory capability or learning mode. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following is a four-channel ABS system?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Delphi DBC-7 systems are used almost exclusively on _____ vehicles.</strong></h2></h2></h3></section><section><h3><h2><h2><strong> </strong>Diagnosing an integral ABS system is being discussed. Technician A says some integral ABS systems have a high-pressure accumulator. Technician B says some integral ABS systems use high pressure power steering fluid for brake assist. Who is correct?</h2></h2></h3></section><section><h3><h2><h2><strong>ABS system bleeding is being discussed. Technician A says a scan tool must be used to bleed some ABS. Technician B says the base brakes and the ABS must be bled together. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Which of the following is a leading trigger to turn on ABS waring lamps?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>If the computer recognizes a condition that is not correct, it records a:</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Wheel speed sensor failures on newer vehicles are being discussed. Technician A says a code is usually set when a sensor has an erratic signal. Technician B says a code is usually set when a sensor is open. Who is correct?</strong></h2></h2></h3></section><section><h3><h2><h2><strong>The best way to test a wheel speed sensor is with an oscilloscope.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Hard codes indicate full-time problems that are not too difficult to diagnose.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>An analog voltage signal is infinitely variable.</strong></h2></h2></h3></section><section><h3><h2><h2><strong>Technician A says that most wheel speed sensors are permanent magnet types. Technician B says that some Hall-effect wheel speed sensor is used in some ABS. Who is right?</strong></h2></h2></h3></section><section><h3><h2><h2><p>An engine’s upper and lower center main bearings show more wear than the ones toward either end of the crankshaft.</p><p>Technician A says this wear pattern could be due to a bent crankshaft and replacing it with one that is straight will fix the problem.</p><p>Technician B says the cylinder block main bearing bores are mis-aligned and the problem can be fixed by align boring or honing the block.</p></h2></h2></h3></section><section><h3><h2><h2>Blue-gray smoke comes from the exhaust of a vehicle during deceleration. What could be the cause?</h2></h2></h3></section><section><h3><h2>When a cylinder head is disassembled, the valve stem height on the valve is found to be too high. Which of the following can correct this?</h2></h3></section><section><h3><h2><h2>Technician A says the finish left on a cylinder head by a resurfacing machine must be appropriate for the head gasket that will be used. Technician B says the finish can be checked with a metal card that has sample patches of various surfaces textures. </h2><h2>Who is correct? </h2></h2></h3></section><section><h3><h2><h2><p>A cylinder head is being prepared for resurfacing. Technician A says if a core plug appears OK, then it should be left in place. Technician B says all studs must be removed.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>Technician A says main bearing oil clearance can be checked with Plastigage. Technician B says main bearing oil clearance can checked with a dial bore gauge</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>An engine is being rebuilt and the crankshaft connecting rod journals have been ground undersize. Specifications show that the original connecting rod journal size was 2.1228” to 2.1236” If the journals now measure 2.1032”; what size bearing should be used?</h2></h3></section><section><h3><h2><h2><p>An engine’s upper and lower center main bearings show more wear than the ones toward either end of the crankshaft. Technician A says this wear pattern could be due to a bent crankshaft and replacing it with one that is straight will fix the problem. Technician B says the cylinder block main bearing bores are mis-aligned and the problem can be fixed by align boring or honing the block.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>When cleaning a cylinder bore for final assembly, what should be used?</h2></h3></section><section><h3><h2><h2><p>Technician A says the seals on a GDI (Gasoline Direct Injection) injector can be reused after the injector is removed from the cylinder head. Technician B says when MPI (Multi Port Injection) injector o-rings leak, there will be a compression loss in the cylinder. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>A technician is testing a Torque Converter Clutch (TCC) hydraulic circuit. A pressure gauge is observed while applying the accelerator with the transmission in Drive (D) range. During the 2-3 upshift and at approximately 50 mph, if the TCC control valve is operating, what would an acceptable momentary pressure drop be, as seen on the gauge?</h2></h3></section><section><h3><h2><h2><p>Automatic transmission oil pumps are being discussed. Technician A says vane or gear type oil pumps, both create an area of low pressure within the inlet chamber as the pump turns. Technician B says vane or gear type oil pumps provide a variable level of output fluid volume.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>An engine coolant temperature (ECT) sensor is being tested. Technician A says that a Negative Temperature Coefficient (NTC) Sensor can be tested by checking the voltage drop across the sensor. Technician B says that resistance within the sensor will go up when the engine coolant temperature is cold on this type of sensor.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>A magneto resistive/analog vehicle speed sensor (VSS) is being tested. Technician A says that the transmission shaft should be rotated while checking for DC voltage output. Technician B says the sensor resistance should be checked.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>Technician A says the fluid level on some automatic transmissions is checked by removing a level control plug. Technician B says in the case of a level control plug, the fluid level should be checked with the engine off. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>Technician A says that, when testing transmission actuator solenoids, a normally closed solenoid should block air flow when energized. Technician B says that a normally open solenoid should allow air flow when energized. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>When inspecting a planetary gear set, Technician A says that the pinion gear side clearance should be checked with a feeler gauge. Technician B says that if any part of the planetary gear set fails inspection, the entire gear set must be replaced. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>Technician A says that transaxle final drive side bearing preload is typically measured with an inch pound torque wrench. Technician B says that all end-play must be removed when adjusting bearing preload.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>After removing a transmission from a vehicle, inspections should be performed. Technician A says the rear main seal and engine block core plugs should be inspected for leakage. Technician B says the flex plate and transmission alignment dowel pins should be inspected for damage.</p>Who is correct? </h2></h2></h3></section><section><h3><h2><h2>Excessive clutch pedal free play can cause:</h2></h2></h3></section><section><h3><h2><h2><p>With the clutch pedal fully depressed and the transmission is in gear, a noise is heard coming from the bell housing area. Technician A says the noise could be caused by a worn pilot bushing. Technician B says that the noise is probably due to a defective transmission input shaft. </p>Who is correct?</h2></h2></h3></section><section><h3><h2><h2><p>Technician A says that if a transmission is hard to shift into gear, the problem is likely in the clutch.</p><p>Technician B says that hard shifting can be caused by binding shift linkage or synchronizers.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>Two technicians are installing a transmission in a rear wheel drive vehicle and the transmission case will not seat against the bellhousing. </p><p>Technician A says that since its close you can draw it into place with the mounting bolts. </p><p>Technician B says that the transmission should be removed and the clutch disc alignment should be rechecked. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>Technician A says that engine/transmission misalignment can cause a pulsation in the clutch pedal.</p><p>Technician B says that dowel pins are only necessary to mate the transmission and engine together during factory assembly.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>A transaxle jumps out of gear. Which of the following should the technician check first?</h2></h3></section><section><h3><h2><h2><p>A (RWD) rear wheel drive vehicle with a one-piece driveshaft has excessive driveshaft vibration during low speed acceleration. </p><p>Technician A says the vibration could be caused by binding U-joints.</p><p>Technician B says improper driveshaft angle could be the cause.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>When setting up a ring and pinion, checking the gear tooth contact pattern is used to check what setting?</h2></h3></section><section><h3><h2><h2><p>Two technicians are discussing axle shafts and bearings. </p><p>Technician A says an axle shaft that rides on straight roller bearings and is retained with C-clips may require replacement if there is excessive radial (up and down) play.</p><p>Technician B says an axle shaft with sealed ball bearings that is attached with a retaining plate may have to be shimmed to set preload/end play. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>Two technicians are discussing replacement of a rack and pinion assembly on a vehicle equipped with an airbag. Technician A states to center the steering before disconnecting the steering shaft coupler and to center the new steering gear before installation. Technician B states to disconnect the battery or remove power from the airbag module before replacing the rack and pinion.</p></h2><h2><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>A vehicle with power steering exhibits poor assist in one direction and a pressure tester has been installed. When the wheels are steered full lock, the pressure tester readings in one direction are lower than the other. With the shut off valve closed, the readings are normal. Technician A says that these readings could be caused by a bad steering gear. Technician B says that these readings could be caused by a bad pump.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>A traditional (non-rack type) steering gearbox is being adjusted. Which of the following should be adjusted last?</h2></h3></section><section><h3><h2><h2><p>Technician A says that a bent idler arm can cause bump steer. Technician B says that a worn rack mount bushing could cause bump steer.</p>Who is correct?</h2></h2></h3></section><section><h3><h2><h2><p>Technician A says that horizontal looseness in a Pitman arm stud can cause a vehicle to wander at highway speeds. Technician B says vertical movement in an idler arm can cause toe change.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>A vehicle that had a lower control arm replaced returns with suspension noise and failed bushings in the new lower control arm.</p>What could be the cause</h2></h2></h3></section><section><h3><h2><h2><p>After an accident, a steering knuckle has a damaged tapered hole where the ball joint attaches.</p><p>What would be the proper repair?</p></h2></h2></h3></section><section><h3><h2><h2><p>A vehicle wanders while being driven on level roads. Technician A says excessive toe out could be the cause. Technician B says too much positive caster could be the cause.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>The alignment readings listed below could result in which of these conditions?</p></h2><p> </p><p>Camber -</p><ul><li>Readings: (Left +.75) (Right +1.5)</li><li>Specs (Left or Right): 0.5 +/- 0.5</li></ul><p>Caster -</p><ul><li>Readings: (Left +3.5) (Right 2.7)</li><li>Specs (Left or Right): 3.0 +/- 0.5</li></ul><p>Toe -</p><ul><li>Readings: (Left +0.07) (Right +0.17)</li><li>Specs (Left or Right): 0.20 +/- 0.15 (total toe)</li></ul></h2></h3></section><section><h3><h2>On a car with disc/drum brakes, the front brakes grab quickly when light pedal pressure is applied. This problem could be caused by a bad:</h2></h3></section><section><h3><h2>All of the following are methods for testing brake fluid EXCEPT:</h2></h3></section><section><h3><h2>A technician has just overhauled the front disc brakes on a vehicle with front disc and rear drum brakes. When he attaches a pressure bleeder (pressurized to about 25 psi) to the master cylinder, he cannot get any fluid to come out of the disc brake caliper bleeder screws. Which of the following is MOST LIKELY the cause?</h2></h3></section><section><h3><h2>The rear brakes on a disc/drum system grab and lock up when applying the brakes normally. This could be caused by:</h2></h3></section><section><h3><h2>Technician A says when pushing a caliper piston into the bore, you should open the bleeder screw. Technician B says some rear caliper pistons need to be turned to retract into the bore. Who is correct?</h2></h3></section><section><h3><h2>A vehicle’s ABS warning light is on and a DTC for the left front wheel speed sensor is found in the computer’s memory. When checked with an oscilloscope, the waveform for the left wheel speed sensor is erratic and uneven. Technician A says the sensor air gap is excessive. Technician B says the tone ring is probably damaged. Who is correct?</h2></h3></section><section><h3><h2>Technician A says that DOT 5 brake fluid has a lower boiling point than DOT 4. Technician B says that DOT 4 brake fluid is silicone based and should never be used in an ABS system. Who is correct?</h2></h3></section><section><h3><h2>Two technicians are discussing Electronic Stability Control (ESC) systems. Technician A says the ESC control module uses inputs from the steering wheel rotation sensor and wheel speed sensors to calculate the driver’s intended path. Technician B says the ESC control module uses inputs from the lateral acceleration and yaw rate sensors to calculate the vehicle’s actual path. Who is correct?</h2></h3></section><section><h3><h2><h2><p>While testing a starting circuit, the technician finds that the engine cranks slowly. The starter current draw is 80 amps and the battery voltage while cranking is above 11 volts.</p></h2><h2><p>What should the technician do next?</p></h2></h2></h3></section><section><h3><h2>Another way of saying 75 millivolts is:</h2></h3></section><section><h3><h2><h2><p>An ohmmeter is being used to check a circuit for continuity. Technician A says an infinity or “OL” reading indicates no continuity. Technician B says a zero reading on an ohmmeter indicates continuity.</p></h2><h2><p>Who is right?</p></h2></h2></h3></section><section><h3><h2>Two lights are connected in parallel. An additional light is added, also wired in parallel. Technician A says the total resistance will decrease. Technician B says the total resistance will increase. Who is correct?</h2></h3></section><section><h3><h2><h2><p>Technician A says a short circuit to ground in a circuit will decrease resistance. Technician B says a short circuit will increase current flow.</p></h2><h2><p>Who is right?</p></h2></h2></h3></section><section><h3><h2><h2>A start/clutch interlock switch is being tested. Technician A says that, with the clutch pedal in the released position, the switch should have continuity when checked with an ohmmeter. Technician B says that, with the pedal depressed, there should be voltage on both sides of the switch when checked with a voltmeter. </h2><h2>Who is correct?</h2></h2></h3></section><section><h3><h2><h2>Technician A says that the rectifier bridge consisting of six diodes changes DC to AC voltage. Technician B says that an externally grounded alternator can be full-fielded by grounding the field terminal. </h2><h2>Who is correct?</h2></h2></h3></section><section><h3><h2>During an alternator output test, a 100 ampere alternator with an integral regulator produces 60 amperes. The cause of the low alternator output could be:</h2></h3></section><section><h3><h2>An airbag system is being serviced. Technician A says to disconnect the yellow SRS connectors at the front of the vehicle. Technician B says to disconnect and isolate the negative battery cable. Who is right?</h2></h3></section><section><h3><h2>A system with a low-pressure on the low side and a heavy frost accumulation on the outlet side of the Thermostatic Expansion Valve (TXV) may indicate a:</h2></h3></section><section><h3><h2><h2><p>During an A/C system performance test, the air temperature at the center outlet duct is warm to slightly cool. The low side gauge is reading lower than normal and the high side gauge, at the compressor, is reading lower than normal. Technician A says to check for a clogged orifice tube. Technician B says to check for a plugged condenser. </p>Who is correct?</h2></h2></h3></section><section><h3><h2><h2><p>During an A/C system performance test, high side pressure was found to be exceeding the high-pressure switch’s protection limit and the A/C compressor continued to run.</p><p>Technician A says that the high-pressure cutout switch could be defective.</p><p>Technician B says that there could be an air flow obstruction at the evaporator.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2>Which of the following could cause higher than normal high side pressure and poor cooling?</h2></h2></h3></section><section><h3><h2><h2><p>During A/C system operation, a knocking sound can be heard coming from the compressor. Technician A says that there could be internal compressor damage.</p>Technician B says that the compressor mounting brackets and bushings should be checked.</h2><h2>Who is correct?</h2></h2></h3></section><section><h3><h2><h2><p>Technician A says that the pressure cycling switch is usually located on the accumulator.</p>Technician B says that the refrigerant must be recovered from the system before the switch can be removed.</h2><h2>Who is correct?</h2></h2></h3></section><section><h3><h2>If the diaphragm chamber at the top of the expansion valve developed a leak, what effect would it have on the valve?</h2></h3></section><section><h3><h2><h2><p>Technician A says the ambient temperature switch protects the compressor from damage.</p><p>Technician B says the ambient temperature sensor provides input for the Automatic Temperature Control (ATC) system. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>When troubleshooting an Automatic Temperature Control (ATC) system, the system responds when the ambient and in-vehicle temperature sensors are heated and cooled. However, there is no response when the sun load sensor is exposed to a fluorescent light source.</p><p>Technician A says that the problem is with the ATC system programming.</p><p>Technician B says that the problem is with the sun load sensor.</p>Who is correct?</h2></h2></h3></section><section><h3><h2><h2><p>A customer brings their vehicle in for service. They describe symptoms of poor drivability and state that the vehicle has been repaired for the same problem in the past.</p><p>What should you do first?</p></h2></h2></h3></section><section><h3><h2><h2><p>Two technicians are listening to a tapping noise coming from the top end of a V8 engine.</p><p>Technician A says the noise could be a valve in need of adjustment.</p><p>Technician B says the noise could be an exhaust leak.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>When troubleshooting a slow drain on the battery, which diagnostic tool should be used?</h2></h3></section><section><h3><h2><h2><p>A vehicle's exhaust system is being tested for a restriction using a vacuum gauge, connected to the intake manifold.</p><p>Technician A says a vacuum level that drops 3 in. Hg below the original reading when accelerating to 2500 RPM and holding for a few minutes indicates a restricted exhaust.</p><p>Technician B says if vacuum does not increase when closing the throttle from 2000 RPM it indicates a restricted exhaust. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>Technician A says an incorrect CKP (Crankshaft Position Sensor) gap can cause a misfire.</p><p>Technician B says when testing two wire CKP with an ohmmeter, the meter should read infinity when the ohmmeter is connected between the pins in the connector.</p>Who is correct?</h2></h2></h3></section><section><h3><h2><h2><p>A vehicle is towed in with a 'cranks but won't start' condition. A 'noid' light test finds no injector pulses and there is no spark present at any of the plug wires.</p><p>Technician A says the vehicle needs a computer.</p><p>Technician B says the vehicle needs an ignition module.</p>Who is correct?</h2></h2></h3></section><section><h3><h2><h2><p>Technician A says with the vacuum line connected to the fuel pressure regulator; fuel pressure should be higher than with the line disconnected.</p><p>Technician B says some fuel pressure regulators can suffer from a ruptured diaphragm, allowing fuel to be sucked into the intake manifold through the vacuum line causing a rich running condition.</p>Who is correct?</h2></h2></h3></section><section><h3><h2><h2>When measuring the internal resistance of a fuel injector, you find it to be at 15 ohms. What happens to the resistance as the injector temperature increases?</h2></h2></h3></section><section><h3><h2><h2><p>On a gasoline engine, the Camshaft Position Sensor (CMP) signal has failed and set a DTC. Technician A says the ECM/PCM will command the camshaft timing to freeze in the last valid commanded position. Technician B says both the commanded and actual CMP PIDs will indicate 0 Degrees on the scan tool. </p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>A customer has brought their vehicle into your shop, and it has a malfunction in the evaporative emissions system. This vehicle is equipped with an electric motor EVAP system leak detection pump. What tool would be used to check the leak detection pump?</h2></h3></section><section><h3><h2><h2><p>A diesel engine has White smoke coming from the exhaust. Technician A says a leaky Injector could be the cause. Technician B says it could be a dirty Injector. </p>Who is correct?</h2></h2></h3></section><section><h3><h2>A diesel engine with wet cylinder sleeves is being disassembled. What should the technician do regarding the sleeves? </h2></h3></section><section><h3><h2><h2><p>On a cold winter morning, a diesel engine vehicle will not start. Technician A says using number one grade diesel fuel could be the cause. Technician B says using number two fuel could be the cause.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>An oil bypass valve will open under which condition:</h2></h3></section><section><h3><h2>The PCM/ECM on a diesel engine vehicle has detected insufficient EGR flow and set a DTC. The EGR valve is electronically controlled and the engine has a sensor that detects manifold temperature. With the key on, engine off, the technician commands the EGR valve while monitoring the EGR valve position parameters. Based on this test, the technician determines that the EGR valve can respond to the commands. However, when the EGR valve is commanded while driving on the highway at a steady cruise, there is no increase in manifold air temperature. What could be the cause?</h2></h3></section><section><h3><h2>When the regeneration process is being monitored by the PCM/ECM, what could indicate normal operation?</h2></h3></section><section><h3><h2><h2><p>Technician A says in an Electronic Unit Injector (EUI) fuel system, the injection pressure is created by the force provided by the engine’s camshaft, but the quantity of fuel injected is controlled by the PCM/ECM powering the injector solenoid.</p><p>Technician B says in a Pump-Line-Nozzle (P-L-N) fuel system, the injection pump creates the high pressure necessary for injection and also controls the injection timing. </p>Who is correct?</h2></h2></h3></section><section><h3><h2><h2><p>A diesel engine has higher than specified fuel rail pressure at idle. Technician A says a clogged fuel return could be the cause. Technician B says that a faulty fuel pump could be the cause.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2><h2><p>A common rail diesel engine had 2 injectors replaced at another shop. The engine idles rough after the injector replacement. There are no DTC’s. Technician A says to check the injector balance rate volume. Technician B says to check the IQA numbers on the injectors to see if they match the IQA values in the ECM.</p><p>Who is correct?</p></h2></h2></h3></section><section><h3><h2>Technician A says that incorrect toe settings will cause feathered wear across the tire tread. Technician B says that underinflated tires have more wear in the center of the tread. Who is correct?</h2></h3></section><section><h3><h2><h2>Which of the following is an example of a piezoelectric sensor?</h2></h2></h3></section><section><h3><h2><h2>An electronically controlled instrument cluster is being diagnosed for no speedometer operation. Which of the following statements is most correct? If the;</h2></h2></h3></section><section><h3><h2><h2>All of the following are components of the air bag module EXCEPT the;</h2></h2></h3></section><section><h3><h2><h2>On a data bus that uses two wires, why are the wires twisted?</h2></h2></h3></section><section><h3><h2><h2>Which of the following statements is true concerning headlight circuits?</h2></h2></h3></section><section><h3><h2><h2>On a vehicle equipped with an immobilizer system, the engine starts for a few seconds and then dies. What is the LEAST likely cause of this?</h2></h2></h3></section><section><h3><h2><h2>If one of the CAN C bus circuits were shorted to ground, all of the following could occur EXCEPT;</h2></h2></h3></section><section><h3><h2><h2>All of the following statements concerning hybrid high-voltage system safety is true EXCEPT;</h2></h2></h3></section><section><h3><h2>The arrow on an air bag sensor must always face the;</h2></h3></section><section><h3><h2><h2>Which of the following is NOT true about a quartz analog speedometer system?</h2></h2></h3></section><section><h3><h2><h2>All of the following can be used to measure movement or position, EXCEPT;</h2></h2></h3></section><section><h3><h2><h2>The purpose of transmitting temperature information along with the tire pressure readings is to:</h2></h2></h3></section><section><h3><h2><h2>What usually controls an oil pressure-warning lamp?</h2></h2></h3></section><section><h3><h2><h2>Which statement is NOT correct? The cornering lights;</h2></h2></h3></section><section><h3><h2><h2>The headlights work in the manual position but do not turn on in the AUTO position. The most likely cause is a;</h2></h2></h3></section><section><h3><h2><h2>Which of the following would NOT be considered a computer input?</h2></h2></h3></section><section><h3><h2><h2>A customer states that his or her engine starts and then dies. This seems to be intermittent. The customer makes arrangements to leave the vehicle for three days to be diagnosed and repaired. During these three days, the vehicle does not have any problems. The immobilizer module does have a stored “Invalid Key.” The MOST likely cause of this problem is the;</h2></h2></h3></section><section><h3><h2>All of the following statements about servicing the BCM are true EXCEPT:</h2></h3></section><section><h3><h2><h2>When inspecting Magnetoresistive sensors, all of the following must be checked EXCEPT;</h2></h2></h3></section><section><h3><h2><h2>Which component within the wiper motor ensures that when the motor is turned off the wiper arms will be brought to the bottom position?</h2></h2></h3></section><section><h3><h2><h2>Which of the following is responsible for sequential sampling?</h2></h2></h3></section><section><h3><h2><h2>All of the following statements concerning multiplexing are true EXCEPT:</h2></h2></h3></section><section><h3><h2><h2>In a single-wire bus network, EMI is controlled by;</h2></h2></h3></section><section><h3><h2><h2>Which statement is the most correct?</h2></h2></h3></section><section><h3><h2><h2>All of the following can cause total bus failure of the J1850 VPWM bus system, EXCEPT;</h2></h2></h3></section><section><h3><h2><h2>Which of the following is NOT used to control the brightness of the instrument panel lamps?</h2></h2></h3></section><section><h3><h2>The purpose of the Occupant Restraint Controller (ORC) is to;</h2></h3></section><section><h3><h2><h2>A sunroof is opening slower than normal and appears to be “jerky” in its operation. The most likely cause of this problem is a;</h2></h2></h3></section><section><h3><h2><h2>Which method may be used to check a computer controlled actuator?</h2></h2></h3></section><section><h3><h2><h2>Which of the following statements about the turn signal circuit is NOT correct?</h2></h2></h3></section><section><h3><h2><h2>All of the following are precautions to prevent static electricity damage when replacing a control module EXCEPT;</h2></h2></h3></section><section><h3><h2>A computer that can communicate on a data bus is known as;</h2></h3></section><section><h3><h2><h2>The splitting of water into hydrogen and oxygen is an example of;</h2></h2></h3></section><section><h3><h2><h2>In a J1850 VPWM bus system, how can a short to ground be isolated?</h2></h2></h3></section><section><h3><h2><h2>In the local interconnect network (LIN) bus;</h2></h2></h3></section><section><h3><h2><h2>The lab scope trace of an ISO-K bus system shows the voltage going to −0.5 volts. This would indicate;</h2></h2></h3></section><section><h3><h2><h2>What is the LEAST likely cause of slow windshield wiper operation?</h2></h2></h3></section><section><h3><h2><h2>The power seats do not move fore or aft. The technician notices that the motor attempts to move the seat then stops. The least <em>likely</em> cause of this is a:</h2></h2></h3></section><section><h3><h2><h2>An electric window with a two-wire motor operates only in one direction. A faulty __________ could cause this problem.</h2></h2></h3></section><section><h3><h2><h2>When inspecting magnetoresistive sensors, all of the following must be checked EXCEPT;</h2></h2></h3></section><section><h3><h2>The bi-xenon headlight system uses;</h2></h3></section><section><h3><h2><h2>Which of the following statements regarding automatic headlight dimming systems is correct?</h2></h2></h3></section><section><h3><h2><h2>To program ignition keys into the immobilizer system, all of the following may be required EXCEPT;</h2></h2></h3></section><section><h3><h2><h2>Which of the following is correct?</h2></h2></h3></section><section><h3><h2><h2>The purpose of the headlight leveling system is to:</h2></h2></h3></section><section><h3><h2><h2>The oil pressure warning light will not turn off with the engine running. A shop gauge confirms good oil pressure. What is the most likely cause?</h2></h2></h3></section><section><h3><h2><h2>What is the Whetstone Bridge used to measure?</h2></h2></h3></section><section><h3><h2><h2>The depressed-park windshield wiper systems generally park the blades by;</h2></h2></h3></section><section><h3><h2><h2>When diagnosing a memory seat system, you find that the driver’s seat does not move at all. The first procedure you should perform is;</h2></h2></h3></section><section><h3><h2><h2>When the headlights are switched from low beam to high beam all headlights go out. All of the following can cause this EXCEPT:</h2></h2></h3></section><section><h3></h3></section><section><h2></h2></section><section><h3></h3></section>