ASE - Automotive Service Excellence Practice Test #3 1

Question 1

A technician is testing a battery and finds it reads 12.4 volts at rest but drops to 9.8 volts during cranking.
The battery passes a load test at 50% of CCA rating.
What is the MOST likely cause of the hard-start condition?

Accepted Answer

The battery terminals have high-resistance corrosion reducing available voltage

Answer

The battery has excessive internal resistance and should be replaced

Answer

The starter motor is drawing too much current due to worn brushes

Answer

The charging system is not fully recharging the battery between starts

Question 2

During a cooling system inspection, a technician finds the upper radiator hose collapses when the engine cools down after shutdown. What is the MOST likely cause?

Accepted Answer

A failed radiator cap that cannot hold vacuum relief open

Answer

A faulty thermostat that is stuck in the open position

Answer

A collapsed lower radiator hose restricting coolant flow

Answer

An air pocket trapped in the cooling system causing a vapor lock

Question 3

A front-wheel-drive vehicle produces a rhythmic clicking noise that increases with vehicle speed and is loudest during sharp turns. The noise disappears when driving straight. What component is MOST likely at fault?

Accepted Answer

A worn or failed outer CV (constant velocity) joint

Answer

A worn front strut bearing plate

Answer

A damaged wheel bearing on the front axle

Answer

A loose wheel lug nut causing the wheel to wobble

Question 4

A vehicle's OBD-II scanner shows a P0420 code — 'Catalyst System Efficiency Below Threshold.' Which test would BEST confirm the catalytic converter is the root cause before replacing it?

Accepted Answer

Compare upstream and downstream oxygen sensor waveforms with a lab scope

Answer

Perform a vacuum test at idle to check for engine combustion leaks

Answer

Check exhaust back pressure with a gauge at the upstream O2 sensor bung

Answer

Inspect the air filter and mass airflow sensor for contamination

Question 5

A technician measures excessive play in a rack-and-pinion steering gear. The tie rod ends, ball joints, and wheel bearings are all within specification. What is the MOST likely cause of the steering looseness?

Accepted Answer

Excessive internal wear in the rack-and-pinion unit itself

Answer

Worn or loose steering column U-joints

Answer

Low power steering fluid causing pump cavitation

Answer

Misaligned front wheels causing the steering to wander

Question 6

An engine oil analysis report shows a high concentration of coolant in the oil. The cooling system pressure test holds steady and no white exhaust smoke is observed. Where is the coolant MOST likely entering the oil?

Accepted Answer

A failed intake manifold gasket on an engine with a coolant-crossover passage

Answer

A cracked cylinder head allowing combustion gas to enter the water jacket

Answer

A leaking head gasket between an oil gallery and a water jacket

Answer

A cracked engine block near a freeze plug allowing external coolant entry