ASE Practice Test #1 3

Question 1

A vehicle has a cooling system that loses coolant with no visible external leaks. What should the technician check FIRST?

Accepted Answer

Perform a block test (combustion leak test) to check for exhaust gases in the coolant, and a pressure test to find internal leaks at the head gasket or EGR cooler

Answer

Replace the radiator cap

Answer

Drain and refill the cooling system

Answer

Replace the water pump

Question 2

What does a "High Resistance" result in a voltage drop test on a ground circuit indicate?

Accepted Answer

There is unwanted resistance (from corrosion, loose connection, or damaged wire) in the ground path, reducing current flow and causing the component to malfunction

Answer

The component is drawing too much current

Answer

The battery voltage is too high

Answer

The ground circuit is functioning normally

Question 3

When performing a 4-wheel alignment, the technician measures the rear axle thrust angle. What does a non-zero thrust angle indicate?

Accepted Answer

The rear axle is not perpendicular to the vehicle's centerline — the vehicle will "dog track" (rear tires do not follow the path of the front tires)

Answer

The rear toe adjustment is perfectly aligned to the vehicle centerline

Answer

The front wheels need camber adjustment

Answer

The steering wheel is off-center only

Question 4

What is the purpose of the EVAP system purge valve in a fuel evaporative emission control system?

Accepted Answer

To allow fuel vapors stored in the charcoal canister to be purged into the engine intake for combustion when conditions allow

Answer

To vent excess pressure from the fuel tank to atmosphere

Answer

To seal the charcoal canister from the atmosphere when the engine is running

Answer

To recirculate exhaust gas back into the intake manifold

Question 5

A customer complains their vehicle pulls to the right while braking. What is the MOST likely cause?

Accepted Answer

A stuck or seized left front brake caliper piston not applying, or a collapsed brake hose on the left side restricting brake fluid flow to the left front caliper

Answer

Right front tire overinflated

Answer

Low brake fluid level in the reservoir

Answer

Worn rear brake shoes equally on both sides

Question 6

Which scan tool data parameter BEST indicates throttle body deposits are causing idle quality issues?

Accepted Answer

Long-term fuel trim (LTFT) significantly positive at idle, indicating the ECM is adding fuel to compensate for less air than expected through the partially restricted throttle bore

Answer

Negative long-term fuel trim at cruise speed

Answer

Coolant temperature above normal

Answer

Battery voltage below 12V