Pinpoint Test Kc - Knock Control
NOTE:
Enter this test only when directed here from QUICK TESTS.
- Disconnect and plug vacuum hose at distributor. Connect timing light. Start engine. Unplug knock control service connector, located near ECA. If timing retards, service knock sensor and/or knock sensor wiring. If timing does not retard, go to next step.
- Determine and record ignition timing setting. Tap intake plenum with plastic mallet. If timing does not retard, go to step 4). If timing retards, go to next step.
- Reconnect knock control service connector, located near ECA. Determine and record ignition timing setting. Tap intake plenum with plastic mallet. If timing does not retard, knock control unit is okay; go to next step. If timing retards, replace knock control unit.
- Turn ignition off. Unplug knock control service connector, located near ECA. Install a known good knock sensor. Start engine. Tap intake plenum with plastic mallet. If timing retards, replace knock sensor. If timing does not retard, go to next step.
- Check VPWR and GND (Yellow/Green and Black/Yellow wires respectively) to knock control unit for shorts or open circuits. Service wires as necessary. If wires are okay, replace knock control unit.