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Knock Sensor: MPV

  1. Resistance Inspection

    Disconnect Knock Sensor (KS) 2-pin harness connector. Using ohmmeter, measure resistance between KS terminals "A" and "B". Resistance should be about 560,000 ohms at 68°F (20°C). If resistance is not as specified, replace KS. If KS is within specification, go to next step.

  2. Open Circuit Inspection

    Disconnect PCM 104-pin harness connector. Connect 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity between following terminals:
    • KS harness connector terminal "A" (Blue/White wire) and breakout box terminal No. 57.
    • KS harness connector terminal "B" (Red/White wire) and breakout box terminal No. 4.

    If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness.

  3. Short Circuit Inspection

    Check for continuity between following:
    • KS harness connector terminal "A" (Blue/White wire) and power supply.
    • KS harness connector terminal "B" (Red/White wire) and power supply.
    • KS harness connector terminals "A" (Blue/White wire) and ground.
    • KS harness connector terminals "B" (Red/White wire) and ground.

    If continuity is present, repair short circuit in suspect wire or replace wire harness.

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