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ASE Automobile

A6 Electrical / Electronic Systems — practice test

Studying for A6 (Electrical / Electronic Systems)? Overhaul Prep has 122 verified A6 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

122A6 questions
100%with explanations
9,711questions in total
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Sample A6 questions

Straight from the bank — answers highlighted, with the explanation underneath.

A simple series circuit is supplied by a 12-volt source and contains a single resistor of 3 ohms. Using Ohm's law, how much current flows in the circuit?

  1. 4 amperes
  2. 36 amperes
  3. 0.25 ampere
  4. 15 amperes
WhyOhm's law states I = E / R, so 12 V divided by 3 ohms equals 4 amperes. The 36-ampere distractor comes from multiplying voltage by resistance (E x R) instead of dividing, a common error.

Two technicians are discussing a high-speed CAN bus. Technician A says the bus uses two wires, CAN High and CAN Low, that carry opposite (differential) voltage signals. Technician B says a 120-ohm terminating resistor at each end of the bus results in about 60 ohms measured across the two data wires with the network off. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyHigh-speed CAN uses differential signaling on CAN-H and CAN-L, and the two 120-ohm terminating resistors are electrically in parallel, measuring about 60 ohms across the bus. Both statements are correct.

An engine will not crank and the starter solenoid does not click. The battery is fully charged and the headlights stay bright when the key is held in START. Which is the MOST likely cause?

  1. A shorted starter armature
  2. A discharged battery
  3. An open in the starter control circuit (neutral safety switch, starter relay, or ignition switch)
  4. High resistance in the positive battery cable
WhyBright, steady lights with no solenoid click show the battery/power side is fine but the control circuit is not energizing the solenoid. A shorted armature, dead battery, or high-resistance cable would dim the lights or produce a click.

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