Practice Test GeeksASE4 - ASE Automobile Engine Performance Practice Test
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Computerized Engine Controls 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 Computerized Engine Controls flashcards as text

  1. When using a scan tool to monitor freeze frame data, the technician can determine:

    Answer: The engine operating conditions at the moment a fault code was set

    Freeze frame data captures a snapshot of sensor values at the exact moment a fault code was triggered, aiding diagnosis.

  2. A knock sensor DTC is set and the engine has excessive spark retard. The knock sensor circuit tests good. The NEXT step is to:

    Answer: Check for carbon deposits causing actual detonation

    If the knock sensor and circuit are good, actual detonation from engine problems like carbon deposits may be triggering the sensor correctly.

  3. The VVT (Variable Valve Timing) system uses which parameter to control camshaft advance?

    Answer: Oil pressure delivered via ECM-controlled solenoids

    VVT systems use engine oil pressure directed by ECM-controlled solenoids to hydraulically advance or retard the camshaft timing.

  4. A P0016 code (Crankshaft/Camshaft Correlation Bank 1, Sensor A) is stored. This indicates:

    Answer: The camshaft is not in the expected position relative to the crankshaft

    P0016 means the ECM detected a correlation error between CKP and CMP signals — the cam and crank timing do not match the expected relationship.

  5. What is the purpose of the ECM's adaptive fuel strategy (long-term fuel trim)?

    Answer: To learn and compensate for long-term changes in engine components

    Long-term fuel trim allows the ECM to permanently adjust base fuel delivery to compensate for gradual changes like injector wear or sensor drift.

  6. A vehicle communication fault occurs when connecting the scan tool. The FIRST thing to verify is:

    Answer: Battery voltage and the integrity of the DLC (Data Link Connector) power and ground circuits

    Scan tool communication requires proper battery voltage and clean power/ground at the DLC — these must be confirmed before assuming a deeper fault.