ASE G1 Exam Questions

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21.

The tire of a vehicle shows feathering of the tread. Which of the following alignment angles requires adjustment?

  • Toe

  • Camber

  • Caster

  • Thrust

Correct answer: Toe

Incorrect toe adjustment can cause feathering of the tire tread and poor vehicle handling. A vehicle with excessive toe-in will have feathering and wear on the outside edges of the tires. Excessive toe-out will cause feathering and inside tire wear on both tires.

Incorrect camber is associated with inside or outside tire wear. Tire wear caused by incorrect camber can occur on one tire only. Caster is a directional stability angle and is not considered a tire wear angle. Thrust angle is related to vehicle tracking and is not a tire wear angle.

22.

A rotational howling noise that increases when the vehicle is turning a corner MOST LIKELY indicates which of the following?

  • A worn wheel bearing

  • A failed CV axle

  • A worn pilot bearing

  • A faulty u-joint

Correct answer: A worn wheel bearing

A worn wheel bearing usually makes a howling noise as it rotates at higher speeds. The amount of noise depends on how much load is put on it. Since turns put an additional lateral thrust load on the bearing, the noise often changes when the vehicle is turning. Weight must transfer to identify which side is affected. Gradual sweeping turns typically do a better job of placing lateral loads on wheel bearings.

23.

Two technicians are discussing a truck with a two-piece driveshaft and a center support bearing. Technician A states the center support bearing is pressed onto the rear portion of the driveshaft. Technician B says the noise made by a faulty carrier bearing will vary with road speed. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct: Technician B

Technician B is correct because the center support bearing rotates at the same speed as the driveshaft and the driveshaft speed increases with road speed. Noise caused by a faulty center support bearing will vary with road speed.

Technician A is incorrect because the rear section of the two-piece driveshaft must be able to move up and down as the rear suspension moves. The center support bearing is pressed into the front portion of the driveshaft and has a bracket attaching it to the vehicle's frame. 

24.

Technician A says in most cases, the transmission pan must be removed to access a serviceable transmission filter. Technician B says many modern transmissions and transaxles have a bolt or plug that is removed to check the fluid level. Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. On vehicles that have a serviceable transmission filter, the pan must typically be removed for filter access. A few manufacturers have spin on type transmission filters and/or drain plugs on the transmission pan. Technician B is also correct. Many modern vehicles have transmissions with a bolt or plug that is removed to check the fluid level. 

25.

Technician A says a malfunction indicator lamp lets the technician know fault codes are stored in the powertrain control module. Technician B says a diagnostic trouble code will let the technician know which part needs to be replaced. Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Technician A is correct because a malfunction indicator lamp illuminates when an emissions-related fault occurs in the powertrain control module.

Technician B is incorrect because fault codes indicate a malfunction in a monitored emissions-related system. A technician should perform diagnostic tests as specified by the manufacturer to determine the root cause of the malfunction.

26.

A vehicle with an automatic transmission has harsh upshifts. A technician is retrieving fault codes related to transmission faults. Which of the following fault codes would MOST LIKELY be related to harsh upshifts?

  • P0716

  • C0716

  • T0716

  • U0716

Correct answer: P0716

The fault code P0716 is related to powertrain malfunctions. The "P" at the beginning of the alpha-numeric code indicates a powertrain malfunction and transmission malfunctions are in this category. This alpha-numeric designation for trouble codes has applied to On Board Diagnostics Second Generation (OBD II) vehicles since 1996.

A "C" in an alpha-numeric fault code stored in a module indicates a fault is stored in a chassis-related module such as an anti-lock brake system. A "B" code stored in a module indicates a fault stored in a body-related module such as a lighting module. "U" codes are reserved for network communication faults, and "T" codes are not used for OBD II-equipped vehicles.

27.

A vehicle owner noticed the oil life monitor message continued to be displayed on the instrument panel message center after changing the oil. Technician A says a scan tool is required to reset the oil life monitor on most vehicles. Technician B says the vehicle owner's manual usually has detailed instructions on resetting the oil life monitor without special tools. Who is correct?

  • Technician B

  • Both A and B

  • Technician A

  • Neither A nor B

Correct answer: Technician B

Technician B is correct because in most vehicles, the owner's manual has instructions on resetting the oil life monitor from the driver's seat without the use of special tools. The procedure is different for each manufacturer.

Technician A is incorrect because special tools such as scan tools are not required to reset the oil life monitor on most vehicles. 

28.

A customer has a concern about a Heating Ventilation and Air Conditioning (HVAC) system that blows warm air when air conditioning is selected on the control panel and the temperature selector is set to the cold position. Technician A says the concern could be caused by an inoperative blend door in the HVAC plenum.  Technician B says this concern could be caused by an inoperative mode door in the HVAC plenum. Who is correct?

  • Technician A

  • Both A and B

  • Technician B

  • Neither A nor B

Correct answer: Technician A

Technician A is correct because the blend door is responsible for regulating the amount of air that travels through or bypasses the evaporator. If the temperature selector on the control panel is moved to the full cold position, all incoming air travels through the evaporator and is cooled. As the driver moves the temperature selector to a warmer position, more incoming air bypasses the evaporator and increases the temperature of the air moving through the vents.

Technician B is incorrect because the mode doors do not affect discharge air temperature. Mode doors direct the discharged air to the windshield, vents, or floor. 

29.

Technician A says a circuit must be in operation to measure electrical current. Technician B says a circuit must be in operation to measure electrical resistance. Who is correct?

  • Technician A

  • Neither A nor B

  • Technician B

  • Both A and B

Correct answer: Technician A

Technician A is correct because a circuit must be in operation for a technician to measure electrical current. A circuit that is turned off or is otherwise not working will not have current flowing through it and so no current can be measured.

Technician B is incorrect because the circuit must be off to measure resistance. Any component must be disconnected from the circuit prior to measuring its resistance. 

30.

Wheels with five lug nuts should be tightened in a:

  • Star pattern

  • Circle

  • Cross-hatch

  • Inverse triangle

Correct answer: Star pattern

Install the lug nuts loosely by hand, then lightly tighten them. Use a torque wrench to tighten the lug nuts to specification in a star or criss-cross pattern.

31.

A customer has a concern about the heating, ventilation, and air conditioning (HVAC) system on a late model vehicle. The HVAC system is discharging the air at the correct temperature, but at the incorrect location. The discharged air cannot be directed to the windshield when defrost is selected on the control panel. Which of the following is MOST LIKELY causing the customer concern?

  • An inoperative mode door

  • An inoperative blend door

  • An inoperative fresh air/recirculated air door

  • A cooling system thermostat that is stuck open

Correct answer: An inoperative mode door

An inoperative mode door will affect the driver's ability to select the location of the discharged air. The mode doors are located in the HVAC case (or plenum) and direct discharged air to the floor, vent, or defrost position.

The blend door controls the temperature of the air and will not affect the location of discharged air. The fresh air/recirculated air door controls the source of the air entering the HVAC system. As the driver selects fresh air, the fresh air/recirculated air door moves to allow air from outside of the vehicle to be drawn into the system. Recirculated air is drawn into the HVAC system from the passenger's compartment. The blend door, mode doors, and fresh air/recirculated air door can be controlled by cables, vacuum motors, electric servo motors, or a combination of each. Many HVAC systems divert all discharged air to the defrost position in the event of a system malfunction. This is a fail safe function that allows the defrost function at all times. A stuck-open thermostat will not affect discharged air, but will typically prevent discharged air from being warm enough when the heater function is selected.

32.

Technician A says a failed cooling system thermostat can prevent an engine from reaching operating temperature. Technician B says some cooling system thermostats are located near the connection between the lower radiator hose and the engine. Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. A thermostat stuck open can prevent an engine from reaching operating temperature. Thermostats are located in numerous places, depending on the manufacturer. Most thermostats are located near the connection between the upper or lower radiator hose and the engine.

33.

Which of the following is NOT used as manual transmission fluid?

  • Hydraulic oil

  • Automatic transmission fluid

  • 80w-90 gear oil

  • 30 weight motor oil

Correct answer: Hydraulic oil

Hydraulic oil is not used in manual transmissions.

Original Equipment Manufacturer (OEM) specifications for manual transmission fluid vary greatly. Engine oil, gear oil, and automatic transmission fluid are three of many options used by OEMs. It is very important to adhere to manufacturers' specifications when selecting manual transmission fluid. 

34.

Which of the following is LEAST likely to leak engine coolant?

  • Rear main seal

  • Head gaskets

  • Freeze plugs

  • Heater core

Correct answer: Rear main seal

Common locations for coolant leaks include the head gaskets, engine heater core, hoses, freeze plugs, and thermostat housing. A rear main seal would leak oil, not coolant.

35.

A technician is using the transmission dipstick to check the level and appearance of the fluid. Silver- or brass-colored glittery flakes suspended in the fluid indicate:

  • Further inspection is required; it is likely internal transmission components are damaged.

  • The transmission is likely within the break-in period.

  • The transmission is equipped with the latest friction modifiers.

  • The transmission is non-serviceable and it should be repaired only when it fails.

Correct answer: Further inspection is required; it is likely internal transmission components are damaged.

Metal flakes should not be visible when inspecting the fluid. The presence of metal particles indicates aluminum, steel, or brass components are damaged in the transmission. 

36.

Two technicians are discussing Diesel Exhaust Fluid (DEF) systems. Technician A says DEF usually needs to be refilled every 5000 to 8000 miles. Technician B states DEF is added to the diesel fuel tank to help reduce emissions. Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Depending on driving conditions, DEF needs to be filled at approximately 5000- to 8000-mile intervals. The DEF tank filler may be near the fuel filler cap, but never put DEF in the fuel tank and only fill the DEF tank with the approved fluid.

37.

A technician is using a vacuum gauge to check the supply of vacuum to a brake booster. Which of the following measurements indicates an adequate supply of vacuum for a vacuum brake booster? 

  • 19 inHg

  • 14.7 psi

  • 11inHg

  • 22 psi

Correct answer: 19 inHg

Most vacuum brake boosters use vacuum supplied from the gasoline engine intake manifold as a power source. Many service publications specify proper intake manifold vacuum to be 16 to 20 inHg. A check valve is located in the vacuum supply line between the intake manifold and the brake booster. The purpose of the check valve is to hold vacuum in the brake booster when the gasoline engine intake manifold vacuum falls below 16 inHg.

38.

Technician A says all vehicles use A/C compressors driven by the drive belt. Technician B says most modern vehicles use a single serpentine belt to drive the A/C compressor. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Technician B is correct because most modern vehicles use a single serpentine belt to drive the A/C compressor. Older automotive air conditioning systems used a V-belt to drive the compressor.

Technician A is incorrect because many hybrid and electric vehicles have A/C compressors driven by high voltage electric motors. This feature allows the A/C to operate without being driven by a gasoline or diesel engine.

39.

Technician A says you should check Technical Service Bulletins (TSBs) prior to performing a procedure that requires the removal of one or more spark plugs. Technician B states that .550" (13.97 mm) is a typical spark plug gap. Who is correct?

  • Technician A only

  • Technician B only

  • Both A and B

  • Neither A nor B

Correct answer: Technician A only

It is a good practice to check for TSBs before beginning any service procedure. In this case, many modern engines have extended service intervals that can make spark plugs difficult to remove from the cylinder head. Typical spark plug gaps range from .024" (.6 mm) to .071" (1.8 mm). The spark plug gap should be checked and adjusted as necessary prior to installation. A very light coat of anti-seize lubricant should be added to the spark plug threads prior to installation.

40.

A technician is checking the fluid level in a differential. Most differentials should be filled:

  • To the bottom of the fill hole

  • One half inch below the fill hole

  • One inch above the threaded hole

  • To the full level on the dipstick

Correct answer: To the bottom of the fill hole

Differential fluid should be level with the bottom of the fill hole.

A fluid level one half inch below the fill hole indicates the possibility of a leak and the differential should be inspected for leaks. Although most fill plugs are threaded to fit the fill plug hole, any level above the bottom of the fill hole indicates overfilling. Differentials do not have dipsticks to check the fluid level.