Exam Practice Questions And Correct

ASE T6 Electrical & Electronic Systems Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• A technician measures a battery voltage of 11.8 volts with the engine

off. What is the most likely cause?

• Alternator overcharging
• Fully charged battery
• Discharged battery
• Faulty starter motor

A healthy 12V battery should read around 12.6 volts. A reading of 11.8 volts indicates the battery is discharged.

• What is the primary purpose of a vehicle’s PCM (Powertrain Control

Module)?

• Control only the engine fuel system 1 / 4

• Control engine and transmission operations
• Provide power to accessories
• Control only emission sensors

The PCM manages both engine and transmission systems to optimize performance and emissions.

• Which device prevents excessive current flow in a circuit?
• Relay
• Fuse
• Switch
• Resistor

A fuse melts when current exceeds its rating, protecting the circuit from damage.

• When a car has an intermittent starting problem, which diagnostic

tool is most useful?

• Tachometer
• Timing light
• Scan tool
• Multimeter

A scan tool can check for stored trouble codes and monitor electrical components in real time.

• Which type of sensor measures engine load for fuel delivery?
• Oxygen sensor
• Mass Air Flow (MAF) sensor 2 / 4

• Throttle position sensor
• Crankshaft position sensor

The MAF sensor measures incoming air, which helps the PCM calculate the required fuel.

6. A diode in a vehicle circuit is used to:

• Increase voltage
• Allow current to flow in only one direction
• Store electrical energy
• Measure resistance

Diodes permit current flow in one direction while blocking it in the opposite direction, protecting circuits.

• What does the ABS module use wheel speed sensors for?
• Controlling steering
• Activating brakes manually
• Preventing wheel lockup during braking
• Controlling tire pressure

Wheel speed sensors provide data to the ABS module to modulate braking pressure and prevent skidding.

• Which unit converts mechanical energy into electrical energy in a

vehicle?

• Battery
• Starter motor
• Alternator 3 / 4

• Ignition coil

The alternator generates electricity from engine rotation to power electrical systems and recharge the battery.

• When diagnosing a short to ground in a circuit, the technician should

first:

• Replace all fuses
• Replace the wiring harness
• Disconnect the circuit and measure resistance to ground
• Jump the battery

Testing resistance helps locate a short before replacing components unnecessarily.

• A technician notices a car’s battery light stays on while driving.

Which is the most likely cause?

• Loose gas cap
• Faulty alternator
• Dead starter
• Bad spark plug

The battery light indicates a charging system problem, commonly caused by a failing alternator.

• What is the function of a relay in a vehicle electrical system?
• Store electrical energy
• Control high current circuits with a low current switch
• Measure voltage drop
• / 4