Practice Test GeeksASE4 - ASE Automobile Engine Performance Practice Test
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Engine Electrical Systems Flashcards

6 cards from real ASE4 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Engine Electrical Systems flashcards as text

  1. A parasitic draw test finds 350 mA of current drain with the vehicle in sleep mode. Maximum acceptable is typically:

    Answer: 100 mA or less

    Acceptable parasitic draw is generally 50 mA or less for most vehicles; some manufacturers allow up to 100 mA, making 350 mA significantly excessive.

  2. To isolate a parasitic draw to a specific circuit, the technician should:

    Answer: Disconnect the battery and check individual fuses with a test light in series

    Placing a test light or ammeter in series with each fuse while monitoring current change allows the technician to isolate the draw to a specific circuit.

  3. A CAN (Controller Area Network) bus fault can cause:

    Answer: Multiple unrelated DTCs across various modules simultaneously

    Since many modules communicate over the CAN bus, a bus fault can produce numerous DTCs across multiple unrelated systems at once.

  4. An alternator with an open diode will produce:

    Answer: Reduced output and AC ripple on the charging circuit

    An open diode reduces alternator output by preventing conversion of part of the AC waveform to DC, and causes measurable AC ripple.

  5. Battery sulfation typically occurs when a battery is:

    Answer: Left discharged for extended periods

    Sulfation occurs when lead sulfate crystals harden on the battery plates during prolonged discharge, reducing the battery's capacity permanently.

  6. A technician uses an inductive ammeter clamp on the negative battery cable and reads 1.8 amps with the car in sleep mode. The FIRST thing to verify is:

    Answer: That all modules have fully entered sleep mode (wait 20–30 minutes after key-off)

    Many modules remain active for several minutes after key-off; a high reading shortly after shutdown may simply indicate normal module sleep transition.