G1

Answer A is wrong. The thermostat stays closed preventing coolant from flowing to the radiator until a certain temperature is reached, helping the engine reach operating temperature quickly. A stuck open thermostat prevents an engine from reaching operating temperature. This has a negative effect on engine performance. Answer B is wrong. It maintains the engine's minimum operating temperature. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct.

A faulty thermostat is being replaced. Technician A says a stuck open thermostat will affect engine performance. Technician B says the thermostat controls the engine's operating temperature. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

A vehicle with power assist brakes has a hard brake pedal with little stopping power. Which of these is the MOST likely cause of this condition? A. The brake booster. B. The master cylinder. C. Air in the system. D. Contaminated brake fluid.

Answer A is correct. A faulty brake booster will result in a hard brake pedal. Answer B is wrong. A faulty master cylinder typically results in a spongy pedal that drifts to the floor after application. Answer C is wrong. Air in the system results in a spongy brake pedal. Answer D is wrong. Contaminated brake fluid damages rubber seals and results in a soft spongy brake pedal.

Technician A says to check the circuits fuse if the actuator is not receiving power. Technician B says if a 15 amp fuse continues to blow to replace it with a 20 amp fuse for added protection. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is correct. A fuse protects a circuit by providing a weak point that will burn open before a sensitive wire or component does. Answer B is wrong. Replacing a fuse with one of a higher rating is not recommended and will compromise and overload the circuit. If a fuse keeps blowing, suspect a short somewhere in its circuit. Answer C is wrong. Technician B is incorrect. Answer D is wrong. Technician A is correct.

A technician measures several spots around a brake rotor with an outside micrometer. Technician A says the technician is checking the rotor for thickness variation. Technician B says the technician is checking the rotor for lateral runout. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is correct. Measure the brake rotor in several different spots for rotor thickness variation. Most minimum specifications are stamped inside the rotor. Answer B is wrong. Use a dial indicator and rotate the rotor to check for lateral runout Answer C is wrong. Technician A is correct Answer D is wrong. Technician A s correct.

A hydroboost brake system has reduced braking performance. Technician A says to check the power steering system. Technician B says to check the vacuum check valve. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is correct. The power steering pump produces pressure for the Hydroboost unit. Answer B is wrong. A vacuum check valve is used on a vacuum power booster. A Hydroboost brake booster uses fluid pressure and a vacuum brake booster uses vacuum. Answer C is wrong. Technician A is correct. Answer D is wrong. Technician A is correct.

A technician is performing an A/C inspection. The fan is set on high but there is little air flow through the vents. Technician A says this could be caused by a clogged cabin air filter. Technician B says there could be an open in the blower motor's power circuit. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is correct. There's a restriction caused by leaves and debris. Answer B is wrong. An open in the power would result in no blower motor operation. Answer C is wrong. Technician A is correct. Answer D is wrong. Technician A is correct.

A rear wheel drive vehicle has a loud clunk when the transmission is placed into gear and a vibration that increases with vehicle speed. Technician A says this is caused by loose universal joints. Technician B says this is caused by an unbalanced driveshaft. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is correct. U-joints allow the driveshaft to provide torque to the rear wheels at different angles. Loose and worn U-joints will make a clunking noise when the transmission is placed into gear. They also cause noise and vibration that increases with vehicle speed. Answer B is wrong. An unbalanced drive shaft will cause a vibration that increases with speed, but would not make a clunking noise when the transmission is placed into gear. Answer C is wrong. Technician A is correct. Answer D is wrong. Technician A is correct.

A technician removes and replaces a worn lower radiator hose on a four cylinder engine. The engine overheats after replacing the hose and adding coolant. Which of these is the MOST likely cause of this condition? A. A faulty ECT sensor. B. A stuck open thermostat. C. An air pocket in the system. D. Electrolysis.

Answer A is wrong. A faulty ECT sensor will cause the vehicle to overheat, but usually if the vehicle overheats after the coolant has been drained and filled it is caused by an air pocket in the cooling system. Answer B is wrong. A stuck open thermostat will result in a below normal operating temperature. Answer C is correct. An air pocket has likely formed. Water pump cavitation and air pockets cause this condition. Answer D is wrong. Electrolysis is caused by coolant breakdown and shorts in the electrical system. It prematurely corrodes aluminum parts like water pumps and thermostat housings.

The TPMS warning light remains illuminated on a direct tire pressure monitoring system, even after driving the vehicle several miles. The LEAST likely cause of this condition is: A. A faulty TPMS sensor. B. A weak TPMS sensor battery. C. Low air pressure in the spare tire. D. A faulty wheel speed sensor.

Answer A is wrong. A faulty TPMS sensor will illuminate the TPMS warning light. Answer B is wrong. A weak or dead TPMS battery will illuminate the TPMS warning light. Answer C is wrong. Low air pressure in a spare tire that includes a sensor will illuminate the TPMS warning light. Answer D is correct. A faulty wheel speed sensor will affect an indirect TPMS system. A direct TPMS uses sensors placed inside of the wheel to sense air pressure.

A front wheel drive vehicle makes a clacking noise that only occurs while cornering. The technician suspects a faulty front axle. Which of these is MOST likely the cause? A. The inner CV joint. B. The outer CV joint. C. The vibration damper. D. The half shaft is bent.

Answer A is wrong. A faulty inner CV joint makes most noise during initial acceleration. Answer B is correct. A faulty or worn outer CV joint makes its most noise while cornering. Answer C is wrong. The damper prevents high speed vibration. Answer D is wrong. A bent axle will cause a vibration that increases with vehicle speed. The outer CV joint is notorious for making clacking and popping noises while turning.

A red colored fluid is seen leaking between the transmission and the engine. Technician A says this is caused by a leaking rear main seal. Technician B says this is caused by a leaking transmission pump seal. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. A leaking rear main seal will result in oil leaking between the engine and transmission bell housing. This will be tan or brown. Transmission fluid is dyed red, indicating the fluid is leaking from the transmission pump seal and not the engine's rear main seal. Answer B is correct. A leaking oil pump seal will result in automatic transmission fluid leaking between the engine and transmission bell housing. Transmission fluid is red and oil is tan or brown colored. Answer C is wrong. Technician B is correct. Answer D is wrong. Technician B is correct.

A vehicle pulls to the left only while braking. Technician A says this could be a restricted left front brake line. Technician B says this could be a frozen right front caliper. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. A restricted left front brake line will cause the vehicle to pull to the right when braking. This is because the right front brake unit has more stopping power. Answer B is correct. A frozen right front caliper will cause the vehicle to pull to the left when braking. Answer C is wrong. Technician B is correct. Answer D is wrong. Technician B is correct.

Technician A says a stuck open PCV valve will cause a lean fuel condition. Technician B says the PCV system removes blowby gases from the crankcase. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. A stuck open PCV valve will cause a lean condition, the engine will misfire and the PCM will attempt to adjust the air fuel ratio accordingly. Answer B is wrong. The PCV system cleans and protects the crankcase from blowby gas bypassing the piston rings and contaminating the engine oil. Vacuum through the open valve draws blowby gas into intake manifold and then into the combustion chamber for re-combustion. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct.

A technician runs a scan and receives a fault code indicating a problem in the MAF sensor circuit. Technician A says this could be caused by a loose wire or an intermittent open. Technician B says this could be caused by a faulty MAF sensor. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. An intermittent circuit causes the MAF sensor to perform one minute and fail the next. Answer B is wrong. There could be a problem with the MAF sensor as well. Further inspection and diagnosis will be required. MAF sensors, hot wire sensors in particular, sometimes require a cleaning to restore operation. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct.

All the lights in a brake light circuit illuminate except one. The MOST likely cause is: A. An open in the brake switch. B. A closed brake switch. C. A burned bulb. D. Excessive resistance in the circuit.

Answer A is wrong. An open in the brake switch would result in no brake light operation. Answer B is wrong. A closed brake switch would result in continuous brake light operation. Answer C is correct. A single bulb or it's associated socket is most likely at fault. In a brake light or parallel circuit, one bulb can burn out while the others are unaffected. Answer D is wrong. Resistance will result in a dimmed bulb.

All of the following are true about testing engine coolant EXCEPT. A. An antifreeze hydrometer indicates the coolants boiling point. B. An antifreeze refractometer displays the percentage of coolant to water. C. An antifreeze test strip indicates the coolants PH balance. D. The engine must be brought to operating temperature before testing the coolants boiling point. All of the following are true about testing engine coolant EXCEPT.

Answer A is wrong. Antifreeze hydrometers show us the freezing and boiling points of an engine's coolant. Answer B is wrong. Antifreeze refractometers display the percentage of coolant to water. Answer C is wrong. Antifreeze test strips indicate the coolants PH balance. Learn more in the read more section. Answer D is correct. Answer D is correct. Practice safety. Don't open the cooling system when it's hot. Carefully squeeze the upper radiator hose to check for heat and pressure first. Release the radiator cap to the first notch to make sure there's no residual system pressure.

The brake fluid in an ABS brake system has become aerated causing a spongy pedal. Which of these DOT brake fluids are MOST likely to cause this condition. A. Dot 2 B. Dot 3 C. Dot 4 D. Dot 5

Answer A is wrong. DOT 5 brake fluid contains silicon and can become aerated. Answer B is wrong. DOT 3 and DOT 4 brake fluids are glycol based and used in ABS systems. Silicon based fluids like DOT 5 can become aerated in an ABS system. Answer C is wrong. DOT 4 brake fluid is glycol based. Answer D is correct. Silicon based fluids like DOT 5 can become aerated in an ABS system.

A vehicle's air conditioner blows cold air while driving at normal speeds, but warm while sitting at stop lights. The LEAST likely cause of this condition is: A. An overheating engine. B. A weak electric fan motor. C. A frozen expansion valve. D. Debris in the condenser fins.A vehicle's air conditioner blows cold air while driving at normal speeds, but warm while sitting at stop lights. The LEAST likely cause of this condition is:

Answer A is wrong. Excessive engine heat affects the condenser's ability to transfer heat. Answer B is wrong. While the vehicle is moving, ram air is passing through the condenser. While at a stop, the weak fan motor is not pulling enough air through, resulting in a loss of heat transfer. Answer C is correct. This is a least likely type question. Once the expansion valve freezes, the air conditioner would have poor performance at all speeds. Answer D is wrong. Debris on the condenser's fins reduces it's ability to transfer heat. This is even more pronounced when the vehicle is at rest.

A vehicle's right front wheel has a growling noise that increases with vehicle speed. The MOST likely cause is: A. Excessive rotor lateral run out. B. Warped rear brake drums. C. A worn CV-joint. D. A worn wheel bearing.Answer A is wrong. Excessive lateral rotor run-out will result in pulsation felt in the steering wheel (front rotors) or the driver's seat (rear rotors).

Answer A is wrong. Excessive lateral rotor run-out will result in pulsation felt in the steering wheel (front rotors) or the driver's seat (rear rotors). Answer B is wrong. A warped brake drum is similar to a warped rotor, causing a pulsation felt in the brake pedal or a pulsating vibration in the driver's seat only when the brakes are applied. Answer C is wrong. A worn CV joint will produce a clacking noise while cornering. Answer D is correct. A worn out wheel bearing will cause a growl that increases with vehicle speed.

All of the following statements are true about jounce bumpers and bump stops EXCEPT. A. They protect the vehicle from sudden impacts. B. They protect the vehicle while carrying heavy loads. C. They are made of hard rubber and foam. D. Only A and B are correct.

Answer A is wrong. Jounce bumpers and bump stops absorb the sudden impact that occurs when a vehicle bottoms out. Answer B is wrong. Two symptoms of missing and worn bump stops include noise and vibration. They're caused by the metal to metal contact while carrying a load or hitting bumps and potholes in the road. Answer C is wrong. They're hard foam and rubber parts that perform the same function but come in different shapes and sizes. Answer D is correct. This is an EXCEPT type question. Answer D is correct because all of the answers above are correct, not just A and B. View a picture of a jounce bumper by clicking the Read more... button below.

Engine mounts were recently replaced on a front wheel drive vehicle with independent suspension. The vehicle now has a steady pull to the left at all speeds. Technician A says this is caused by loose motor mounts. Technician B says this is caused by a misaligned engine cradle. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. Loose or worn motor mounts result in excessive vibrations from the engine. Answer B is correct. A misaligned engine cradle will affect alignment angles resulting in pull. Answer C is wrong. Technician B is correct. Answer D is wrong. Technician B is correct.

Loose tie rods are discovered during the initial inspection of a vehicle's steering linkage. Technician A says loose tie rods will cause a clunking or popping noise while turning. Technician B says loose tie rods will result in constant steering correction and vehicle wander. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. Loose tie rods cause a clunking or popping sound when the wheel is turned. Answer B is wrong. The vehicle will wander, requiring constant correction from left to right to compensate for the loose steering linkage. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct.

A technician is bleeding air from a hydraulic power steering system. All of the following statements are true about this procedure EXCEPT. A. Raise the front tires in the air. B. Turn the wheel from stop to stop to bleed air from the system. C. Flush with fresh power steering fluid. D. Hold the wheel for at least 10 seconds at each steering stop.

Answer A is wrong. Raised the tires to prevent flat spots. Answer B is wrong. Turn the wheel left and right from stop to stop bleeds air from the system. Answer C is wrong. Use the recommended clean power steering fluid. Answer D is correct. Don't hold the wheel against the steering stops for more than five seconds. Doing so increases system pressure so high it can rupture hoses and damage system components.

The engine of a vehicle will start, but is slow cranking. Technician A says there may be resistance in the starter circuit. Technician B says to perform a voltage drop test to test for excessive resistance in the starter circuit. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. Resistance in the starter circuit will result in a slow cranking engine. The technician should inspect and test the battery before the starter circuit. Answer B is wrong. Perform a voltage drop test to find excessive resistance in a circuit. Answer C is correct. Both technicians are correct, but the battery should be tested and ruled out before testing the starter circuit. Answer D is wrong. Both technicians are correct.

A vehicle with a power rack and pinion steering system is binding only while turning corners. Which of these are LEAST likely to cause this condition. A. Strut mount bearing. B. Worn rack bushings. C. Worn rack and pinion gear. D. Lower ball joint.

Answer A is wrong. Strut mount bearings can loose vital lubrication and bind while cornering. Answer B is correct. Worn rack bushings cause a vehicle to wander. This is a least likely type question. Notice the other three options cause binding in the steering system. Answer C is wrong. A worn power steering rack gear can bind causing difficulty while cornering. Answer D is wrong. A faulty or dry ball joint will result in binding while turning.

Technician A says fuel filters have an arrow that always points toward the fuel tank. Technician B says a clogged fuel filter will reduce fuel pressure at the fuel rail. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. The arrow points in the direction of fuel flow, toward the engine. Answer B is correct. A clogged fuel filter reduces pressure at the fuel rail and injectors. This will result in a lean fuel condition. Answer C is wrong. Technician B is correct. Answer D is wrong. Technician B is correct.

Two technicians are discussing the evaporator's function in an automotive air conditioning system. All of these are true about the evaporator EXCEPT: A. It removes humidity from the air. B. Refrigerant flows from the bottom to the top. C. Refrigerant enters the evaporator as a liquid. D. The refrigerant changes from a vapor to a liquid as it receives heat from the cabin air.

Answer A is wrong. The evaporator removes humidity from the air. Answer B is wrong. The refrigerant flows from the bottom to the top. Answer C is wrong. The refrigerant enters the evaporator core as a liquid. Answer D is correct. The refrigerant converts from a liquid to a vapor. This is because it boils as it receives heat from the cabin air. Refrigerant has a very low boiling point.

A technician is unable to balance a tire on a vehicle that vibrates at speeds above 35 mph. Technician A says to continue adding weights around the rim up to 10 ounces. Technician B says to dismount the tire from the rim and inspect the inside for liquid or debris. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. The tire most likely has liquid or something inside. Each time the technician spins the tire, the liquid settles in a different place and a weight must be added to a different location on the rim. The technician should not just keep adding weights up to 10 ounces. Answer B is correct. If liquid is suspected inside of a wheel, dismount the tire and inspect inside. TPMS sensors can become clogged from liquid flat repair and malfunction, resulting in a TPMS warning light. Answer C is wrong. Technician B is correct. Answer D is wrong. Technician B is correct.

The headlights get brighter as the engine is revved. Technician A says this is caused by a high capacity battery. Technician B says this is caused by a faulty voltage regulator. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. The vehicle's battery is primarily used for starting the engine. Answer B is correct. At the heart of the charging system is the alternator. If the alternator outputs excessive or high charging voltage, check voltage regulation; electrical components, and electronics will be affected. Answer C is wrong. Technician B is correct. Answer D is wrong. Technician B is correct.

Maintenance free batteries have a built in hydrometer that indicates the batteries state of charge. Technician A says to add distilled water to the battery if the charge indicator turns dark green or black. Technician B says a fully charged battery has a light green charge indicator. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. We do not typically add distilled water to a maintenance free battery. It's sealed and contains either a gel or a glass fiber mat instead of the liquid solution found in standard batteries. Answer B is correct. A bright green charge indicator indicates a charged battery. Answer C is wrong. They're equipped with relief valves that prevent pressure buildup. Answer D is wrong. Technician B is correct

A vehicle blows blue gray exhaust from its tailpipe only when first started in the morning. The MOST likely cause of this condition is: A. Worn piston rings. B. A lean fuel condition. C. A leaking fuel injector. D. Leaking valve seals.

Answer A is wrong. Worn piston rings cause a vehicle to emit blue gray exhaust long after it first starts. Valve seals leak overnight and result in blue gray exhaust smoke after the vehicle has sit for a while. If not severe, this smoke will usually begin to clear up after the engine has run for a while. Answer B is wrong. A lean fuel condition will cause misfires resulting in high levels of hydrocarbon or HC's. Answer C is wrong. A leaking fuel injector will result in a rich fuel condition and black exhaust emitting from the tailpipe. Answer D is correct. A leaking valve seal will cause oil to leak into the cylinder's chamber over time, usually overnight, resulting in blue gray exhaust at first start.

White colored exhaust is billowing from the tailpipe of a vehicle. Which of the following is correct? A. It has worn piston rings. B. It has a leaking head gasket. C. It has worn valve seals. D. It has a leaking fuel injector.

Answer A is wrong. Worn piston rings result in blow-by and oil burning in the combustion chamber producing blue/gray exhaust. Answer B is correct. A leaking head gasket results in a coolant leak from the jacket into the cylinder producing white/gray exhaust. Answer C is wrong. Leaking valve seals result in oil entering the combustion chamber, especially overnight or after sitting a while. At start up the engine will produce blue/gray exhaust from this oil burning in the combustion chamber. This symptom may go away after the engine runs a while, but return again after the vehicle sits. Answer D is wrong. A leaking fuel injector results in a rich condition producing excessive hydrocarbons and black exhaust.

Answer A is wrong. Loose tie rods cause a clunking or popping sound when the wheel is turned. Answer B is wrong. The vehicle will wander, requiring constant correction from left to right to compensate for the loose steering linkage. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct.

Loose tie rods are discovered during the initial inspection of a vehicle's steering linkage. Technician A says loose tie rods will cause a clunking or popping noise while turning. Technician B says loose tie rods will result in constant steering correction and vehicle wander. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. Worn piston rings result in blow-by and oil burning in the combustion chamber producing blue/gray exhaust. Answer B is correct. A leaking head gasket results in a coolant leak from the jacket into the cylinder producing white/gray exhaust. Answer C is wrong. Leaking valve seals result in oil entering the combustion chamber, especially overnight or after sitting a while. At start up the engine will produce blue/gray exhaust from this oil burning in the combustion chamber. This symptom may go away after the engine runs a while, but return again after the vehicle sits. Answer D is wrong. A leaking fuel injector results in a rich condition producing excessive hydrocarbons and black exhaust.

White colored exhaust is billowing from the tailpipe of a vehicle. Which of the following is correct? A. It has worn piston rings. B. It has a leaking head gasket. C. It has worn valve seals. D. It has a leaking fuel injector.

All of the following are true about using a multimeter to test a circuit's continuity EXCEPT. A. Set the multimeter to the Ohms setting. B. Turn the ignition on and power the circuit before testing. C. A reading of OL indicates an open circuit. D. A reading of 0.3 Ohms indicates continuity

. Answer A is wrong. This is an EXCEPT type question. Set the multimeter to the Ohms setting. Answer B is correct. Don't power the circuit before testing, a multimeter passes a small amount of current through the device or wire being tested. It then measures the resulting voltage. Answer C is wrong. Answer B is correct. Answer D is wrong. D. Neither A or B

A technician notices a swollen oil filter while performing recommended maintenance on a vehicle's engine. Which of the following is the MOST likely cause of this ballooned oil filter? A. Stuck open oil pressure relief valve. B. Stuck closed oil pressure relief valve. C. Stuck open oil filter bypass valve. D. Contaminated oil.

Answer A is wrong. An open oil pressure valve will cause low oil pressure. Answer B is correct. A stuck closed oil pressure relief valve could cause high oil pressure and a ballooned oil filter. Answer C is wrong. A stuck open bypass oil valve would not result in a ballooned filter. Answer D is wrong. This is a most likely question. A stuck closed oil pressure relief valve is the most likely cause.

A halogen bulb is being replaced in a headlight system. Technician A says to handle the bulb at it's base during installation. Technician B says to wear gloves or use a piece of paper when handling the glass portion of these bulbs. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. Holding the bulb at its metal base prevents any oil or contaminants from transferring to the delicate bulb. Answer B is wrong. Touching the glass portion of these bulbs leaves damaging oil, even after washing your hands it's recommended to use a glove or a clean paper towel. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct.

The tread of a tire is worn in the center and not on the outer shoulders. Technician A says this is caused by an improper wheel alignment angle. Technician B says this is caused by overinflating the tire. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B

Answer A is wrong. This is caused by an overinflated tire. Answer B is correct. An overinflated tire wears the center of the tire's tread and an underinflated tire wears the outside edges or "shoulders" of the tire. Answer C is wrong. Technician B is correct. Answer D is wrong. Technician B is correct.