20 Vehicle Systems & Components Practice Questions & Answers

1. 1. A customer asks the service consultant to explain the difference between the timing belt and the serpentine belt on her vehicle. Which description is accurate?

   • A.The timing belt adjusts ignition timing electronically; the serpentine belt drives the camshaft through a tensioner.
   • B.The timing belt drives the alternator and the water pump; the serpentine belt keeps the pistons in time with the crankshaft.
   • C.The timing belt drives the camshaft in time with the crankshaft; the serpentine belt drives accessories such as the alternator.✓ Answer
   • D.The timing belt limits the engine's top speed; the serpentine belt turns the camshaft and the oil pump together.

   A timing belt or timing chain ties the camshaft to the crankshaft so the valves open and close in a fixed relationship to piston position; the serpentine belt runs off the crankshaft pulley to drive accessories such as the alternator, water pump and A/C compressor through a tensioner. Because the same teardown exposes them, the water pump, tensioner and idler pulleys are commonly quoted with a timing belt job.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.2-B.3 (basic function of major components; related items)Report a problem with this question

2. 2. A customer asks what the thermostat in the cooling system actually does. Which answer describes its function?

   • A.It circulates coolant through the block and the radiator whenever the engine is turning over.
   • B.It switches the electric cooling fan on and off as coolant temperature rises and falls.
   • C.It blocks coolant flow until the engine warms up, then opens to regulate temperature.✓ Answer
   • D.It holds pressure in the system so that the coolant boils at a higher temperature.

   The thermostat is a temperature-controlled valve between the engine and the radiator: it stays closed so the engine reaches operating temperature quickly, then modulates coolant flow to hold that temperature. Circulating coolant is the water pump's job, fan operation is controlled by the engine computer or a fan switch, and raising the boiling point is the pressure cap's job.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.2 (identify basic function of major components — engine cooling)Report a problem with this question

3. 3. While discussing a battery concern, a customer asks what the alternator does compared with the starter. Which statement is accurate?

   • A.The starter regulates system voltage; the alternator stores the energy the vehicle needs at start-up.
   • B.The starter powers the accessories at idle; the alternator cranks the engine when the key is turned.
   • C.The starter cranks the engine; the alternator recharges the battery and runs the electrical loads.✓ Answer
   • D.The starter recharges the battery while driving; the alternator supplies the current used to crank.

   The battery stores energy, the starter motor uses that stored energy to crank the engine, and once the engine runs the alternator becomes the source of current, recharging the battery and carrying the vehicle's electrical loads. Keeping the two straight matters at the counter because a customer who has been jump-starting repeatedly is describing a charging or storage issue, not a cranking device issue.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.2 (basic function of major components — electrical/starting and charging)Report a problem with this question

4. 4. This question contains the word EXCEPT. Read it carefully. A consultant is explaining which parts are normal wear items that will be replaced periodically over the life of the vehicle. All of the following are normal wear items EXCEPT:

   • A.the alternator, which is replaced at a set interval during scheduled service✓ Answer
   • B.the wiper blades, which harden and lose their edge with sun and use
   • C.the serpentine belt, which cracks and glazes as the rubber ages in service
   • D.the brake pads, which lose friction material every time the brakes are applied

   Wear items are consumables designed to be used up in normal service, so a consultant can tell a customer in advance that they will need replacing. An alternator is a component that is replaced when it fails or tests bad, not on a published interval, so presenting it as routine wear would misrepresent the vehicle's needs.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.3 (identify related items — wear items versus failed components)Report a problem with this question

5. 5. A customer reports that the check-engine light came on and is now flashing. What does a flashing malfunction indicator lamp (MIL) tell the consultant and the customer?

   • A.It signals a fault that can damage the catalytic converter, so driving should stop.✓ Answer
   • B.It signals that a scheduled maintenance service is due and the reminder needs resetting.
   • C.It signals low engine oil pressure, so oil should be added before driving any further.
   • D.It signals that the emission monitors have finished running and the vehicle can be tested.

   On an OBD-II vehicle the MIL is an emissions-system lamp, and the flashing state is reserved for a condition severe enough to damage the catalytic converter, so the customer should be told to stop driving and have the vehicle brought in. The maintenance reminder and the oil pressure warning are separate lamps with separate meanings, which is why a consultant never treats the check-engine light as a service-due light.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.2; OBD-II MIL requirements, 40 CFR 86.1806Report a problem with this question

6. 6. A customer with an automatic transmission asks what the torque converter does. Which answer is accurate?

   • A.It locks the engine to the transmission input with a clutch disc and a pressure plate.
   • B.It lets the two front wheels turn at different speeds in a corner without scuffing the tires.
   • C.It selects the gear ratios inside the transmission by routing fluid to clutches and bands.
   • D.It couples the engine to the automatic transmission through fluid and multiplies torque from a stop.✓ Answer

   A torque converter is the fluid coupling that takes the place of a clutch on an automatic: it transmits engine power to the transmission input through moving fluid and, at low speeds, multiplies engine torque so the vehicle can pull away smoothly. The clutch disc and pressure plate belong to a manual transmission, the valve body is what directs fluid to select ratios, and the differential is what allows different wheel speeds in a turn.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.2 (basic function of major components — drivetrain)Report a problem with this question

7. 7. A front-wheel-drive vehicle is written up and the repair order refers to the transaxle. How should the consultant describe a transaxle to the customer?

   • A.It is a case bolted behind the transmission that splits the drive power to two axles.
   • B.It is the shaft that carries power from the transmission back to the rear drive axle.
   • C.It is the housing at the rear that turns the drive power ninety degrees to the wheels.
   • D.It is a single housing that contains both the transmission and the differential.✓ Answer

   On most front-wheel-drive vehicles the transmission and the differential share one housing mounted transversely with the engine, and that combined unit is called a transaxle; the front axle shafts come straight out of it. The other options describe a transfer case, a driveshaft and a rear drive axle, which are separate units found on rear-wheel-drive and four-wheel-drive layouts.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.1-B.2 (component location and function — drivetrain)Report a problem with this question

8. 8. On a front-wheel-drive vehicle, what do the constant-velocity (CV) joints in the front axle shafts do?

   • A.They cushion driveline shock by letting the axle shafts slip briefly under hard acceleration.
   • B.They transmit drive power to the wheels while the wheels steer and the suspension moves.✓ Answer
   • C.They let the two front wheels turn at different speeds while the vehicle is cornering.
   • D.They hold the front wheel bearings in place and set the amount of toe the wheels run.

   A CV joint is a flexible coupling that keeps delivering power at a constant speed through a changing angle, which is what a driven front wheel needs as it steers and as the suspension travels up and down. Each joint runs in grease held in by a rubber boot, so the boot is the related item a consultant mentions whenever CV axle work is discussed.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.2-B.3 (component function; related items — drivetrain)Report a problem with this question

9. 9. A four-wheel-drive pickup is in the shop and the estimate lists the transfer case. What does a transfer case do?

   • A.It lets the two wheels on one axle turn at different speeds while the vehicle corners.
   • B.It sends drive power from the transmission to both the front and the rear axles.✓ Answer
   • C.It multiplies engine torque with fluid when the vehicle pulls away under load.
   • D.It joins the front axle shafts to the wheel hubs so the wheels can still steer.

   The transfer case sits behind the transmission on a four-wheel-drive vehicle and divides output power between the front and rear driveshafts, usually with a low range as well. The differential is what allows different wheel speeds on one axle, the torque converter is the fluid coupling on an automatic, and the CV joints connect the axle shafts to the driven front wheels.

   Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.1-B.2 (component location and function — drivetrain)Report a problem with this question

10. 10. A customer asks why a vehicle needs both springs and shock absorbers. Which explanation is accurate?

    • A.The springs carry the vehicle's weight and absorb bumps; the shocks damp the springs' motion.✓ Answer
    • B.The springs damp the up-and-down motion; the shocks carry the vehicle's weight at ride height.
    • C.The springs keep the wheels aligned under load; the shocks hold the wheel bearings in the hub.
    • D.The springs hold the brake calipers in position; the shocks set how far the suspension travels.

    Springs support the vehicle's weight and deflect over bumps, but a spring on its own keeps oscillating; the shock absorber converts that motion into heat so the tire settles back on the road. A strut does the same damping job and also serves as a locating member of the suspension, which is why a strut replacement usually brings an alignment with it.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.2-B.3 (component function; related items — chassis)Report a problem with this question

11. 11. A brake estimate lists pads, rotors, a caliper and the master cylinder. How should the consultant describe what the master cylinder does?

    • A.It squeezes the brake pads against the rotor when hydraulic pressure reaches the caliper.
    • B.It boosts pedal effort using engine vacuum so the driver pushes the pedal less hard.
    • C.It keeps the rear brakes from locking before the fronts so the vehicle stays stable.
    • D.It converts force from the brake pedal into hydraulic pressure and sends it to all four wheels.✓ Answer

    The master cylinder is the pump at the pedal: pedal force moves its pistons, which raises hydraulic pressure and pushes fluid out through the brake lines to the wheel brakes. The caliper is what clamps the pads, the vacuum booster is what reduces pedal effort, and proportioning is handled by a valve or by the electronic brake control, so naming these correctly keeps an estimate understandable.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.2 (basic function of major components — brake system)Report a problem with this question

12. 12. A vehicle is in for front brake pads and rotors. Which item is normally serviced along with that repair because the same job takes it apart?

    • A.The front strut assemblies, because the rotors cannot be removed until they are off.
    • B.The caliper slides, mounting hardware and shims, which come off with the pads.✓ Answer
    • C.The wheel bearing hub units, which are pressed out along with the old rotor.
    • D.The steering tie rod ends, which are unbolted to swing the caliper clear of the disc.

    A pad and rotor job takes the caliper off its bracket, so the slides, pins, clips, shims and abutment hardware are in the technician's hand and are cleaned, lubricated or replaced as part of the job; that is why hardware appears on the estimate with the pads. Struts, tie rod ends and hub bearings are not disturbed by removing a caliper and a rotor, so listing them would be selling work the repair does not touch.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.3 (identify related items)Report a problem with this question

13. 13. A steering estimate includes an outer tie rod end. What does a tie rod do, and what related work follows replacing one?

    • A.It connects the anti-roll bar to the control arm, so the bushings are checked next.
    • B.It locates the lower end of the strut in the knuckle, so the wheel must be rebalanced afterward.
    • C.It carries the vehicle's weight at the knuckle, so ride height is reset after replacement.
    • D.It links the steering gear to the knuckle, and changing it alters toe, so an alignment follows.✓ Answer

    A tie rod is the link that passes steering motion from the steering gear or rack to the steering knuckle, and its length is what sets toe, so any tie rod end that is replaced or adjusted puts the toe setting out and an alignment is part of the same job. Weight is carried by the spring and the ball joints, balancing addresses tire and wheel assembly imbalance, and the sway bar links tie the anti-roll bar to the suspension.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.2-B.3 (component function; related items — steering and alignment)Report a problem with this question

14. 14. A consultant is describing a front wheel bearing repair on a late-model light vehicle. Which statement is accurate for most of these vehicles?

    • A.The bearing is a tapered roller set that is cleaned, repacked and adjusted.
    • B.The bearing is part of the knuckle and is replaced only with the knuckle itself.
    • C.The bearing is pressed into the rotor and is replaced whenever the rotor is machined.
    • D.The bearing is a sealed hub unit that is replaced as an assembly rather than repacked.✓ Answer

    Most modern light vehicles use a sealed, pre-loaded hub and bearing unit that is not designed to be opened, cleaned or adjusted, so the repair is a unit replacement and the estimate reflects a part plus labor rather than a service. Serviceable tapered roller bearings that are cleaned, repacked and adjusted are found mainly on older designs and on some trailer and heavy-duty applications.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.1-B.2 (component identification and function — chassis)Report a problem with this question

15. 15. A customer is buying four new tires. Which related service belongs in the same conversation because mounting the new tires disturbs it?

    • A.The wheel bearing cleaning and repack that is required whenever the wheels come off the hubs.
    • B.The TPMS sensor service kit and the relearn procedure that follows the installation.✓ Answer
    • C.The brake fluid exchange that is required whenever the wheels are taken off the vehicle.
    • D.The steering gear adjustment that is required whenever the tire diameter is changed.

    Dismounting a tire exposes the direct tire pressure monitoring sensor at the valve, whose seal, grommet, nut and cap are single-use items sold as a service kit, and many vehicles then need a relearn so the module knows each sensor's position. Taking a wheel off does not open the hydraulic system or require opening a sealed hub, so the other items are not related work.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.3 (identify related items — tire and TPMS service)Report a problem with this question

16. 16. A customer asks which air conditioning part actually makes the air inside the cabin cold. Which answer is accurate?

    • A.The condenser, which sits in front of the radiator and absorbs heat from the cabin air.
    • B.The compressor, which sits on the engine and chills the refrigerant as its pulley turns.
    • C.The evaporator, which sits in the case under the dash and absorbs heat from cabin air.✓ Answer
    • D.The blower motor, which sits in the case under the dash and cools the air as it moves it.

    Cabin air is cooled at the evaporator, which sits inside the HVAC case behind the dash: low-pressure refrigerant boils inside it and takes heat out of the air the blower pushes across it. The condenser rejects that heat to outside air at the front of the vehicle, the compressor raises refrigerant pressure rather than chilling it, and the blower only moves air.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.1-B.2 (component location and function — HVAC)Report a problem with this question

17. 17. A windshield is being replaced on a vehicle with a forward-facing camera mounted at the top of the glass. Which related item must be part of the conversation with the customer?

    • A.An alignment of the front suspension, which shifts when the glass is removed.
    • B.A relearn of the tire pressure sensors, which lose their position when the glass is out.
    • C.A calibration of the driver-assistance camera, which must be aimed through the new glass.✓ Answer
    • D.A reset of the oil life monitor, which is cleared when the battery is disconnected.

    A forward-facing camera for lane keeping or automatic braking looks through the windshield, so once the glass is changed the camera's aim relative to the vehicle is no longer known and the manufacturer's calibration procedure is required before those driver-assistance features can be relied on. Removing glass does not move the suspension or the tire pressure sensors, so those are not related items here.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.3 (identify related items — ADAS recalibration)Report a problem with this question

18. 18. On a hybrid vehicle, what do the orange-sheathed cables identify, and what does that mean for the work?

    • A.Low-voltage sensor circuits, which any technician in the shop may unplug during a service.
    • B.High-voltage circuits, which only a trained technician with protective equipment may service.✓ Answer
    • C.Antilock brake wiring, which has to be disconnected before the wheels are taken off.
    • D.Charging-port wiring, which carries current only while the vehicle is plugged in to charge.

    Orange is the standardized identification color for high-voltage cabling on hybrid and electric vehicles, and those circuits stay energized from the traction battery whether or not the vehicle is plugged in or switched on. Work that touches them requires a trained technician who isolates the high-voltage service disconnect, verifies the absence of voltage and uses insulating protective equipment, which is why a consultant routes such work accordingly and never promises it to an untrained bay.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Task B.2 (hybrid and electric vehicle components); FMVSS 305 high-voltage cable identificationReport a problem with this question

19. 19. A hybrid owner asks why her brake pads still have to be inspected when the vehicle 'brakes with the motor.' Which explanation is accurate?

    • A.Regenerative braking slows the car with the motor, but the friction brakes still wear and can seize.✓ Answer
    • B.Regenerative braking works only at highway speed, so the pads do all the stopping in town.
    • C.Regenerative braking replaces the friction brakes, so the pads come off at the first service.
    • D.Regenerative braking wears the pads faster, so hybrid pads are replaced sooner than others.

    In regenerative braking the drive motor acts as a generator and its resistance slows the vehicle while returning energy to the battery, so the friction brakes do less work and the linings usually last much longer. They are not eliminated: the vehicle still has pads, rotors and calipers for hard stops and holding, and because they are used lightly the slides and caliper hardware can corrode and stick, so inspection and lubrication remain part of scheduled service.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.2-B.3 (hybrid and electric vehicle components; related items)Report a problem with this question

20. 20. This question contains the word EXCEPT. Read it carefully. A consultant is explaining routine service on a battery electric vehicle to its owner. All of the following statements are accurate EXCEPT:

    • A.the engine oil and filter are still changed, because the motor is lubricated by oil✓ Answer
    • B.the cabin air filter is still replaced, because interior air still passes through a filter
    • C.the brake fluid is still serviced, because it absorbs moisture inside the system over time
    • D.the tires still wear and need rotation, and a heavy, high-torque vehicle wears them faster

    A battery electric vehicle has no internal combustion engine, so there is no engine oil and filter service on its schedule at all; what it does still need is tires, brake fluid, cabin filter, coolant for the battery, motor and inverter circuits, and a 12-volt accessory battery. Telling an owner that electric vehicles need nothing, or that they still need oil changes, both misstate the maintenance schedule the vehicle actually carries.

    Source: ASE Study Guide, Automobile Service Consultant (C1) Test, Content Area B, Tasks B.2-B.3 (hybrid and electric vehicle components; related items)Report a problem with this question

Practice questions based on the Official ASE Study Guide task list for the Automobile Service Consultant (C1) test. This site is not affiliated with or endorsed by ASE, and these are not real exam questions. ASE revises its task lists periodically and sets the test length, passing standard and certification requirements — including the two years of service-writing experience required for certification, which is separate from registering for the test. Confirm the current study guide and requirements with ASE before you register. Official ASE C1 test page →