Diagnostic Procedure

Check Knock Sensor Input Signal Circuit For Open And Short-1
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check resistance between ECM terminal 15 and engine ground. Refer to wiring diagram. See Figure.
  Resistance: Approximately 532 - 588 kohm [at 20° C (68° F)]
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: Go to 4.
2. NG: Go to 2.
Check Knock Sensor Input Signal Circuit For Open And Short-II
1. Disconnect knock sensor harness connector. See Figure.
2. Check harness continuity between ECM terminal 15 and knock sensor terminal 1.
  Refer to wiring diagram. See Figure.
  
  Continuity should exist .
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: Go to 4.
2. NG: Go to 3.
Detect Malfunctioning Part
Check the following.
- Harness connectors F20, F252
- Harness for open or short between ECM and knock sensor
1. Repair open circuit or short to ground or short to power in harness or connectors.
Check Knock Sensor
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: Go to 5.
2. NG: Replace knock sensor.
Check Ground Connections
Loosen and retighten three ground screws on the body. See Figure. Refer to GROUND INSPECTION .

OK or NG
1. OK: Go to 6.
2. NG: Repair or replace ground connections.
Check Knock Sensor Shield Circuit For Open And Short
1. Turn ignition switch OFF.
2. Disconnect knock sensor harness connector.
3. Check harness continuity between knock sensor terminal 2 and engine ground. Refer to wiring diagram. See Figure.
Continuity should exist .

OK or NG
1. OK: Go to 8.
2. NG: Go to 7.
Detect Malfunctioning Part
Check the following.
- Harness connectors F20, F252
- Harness connectors F102, M82
- Harness for open or short between knock sensor terminal 2 and engine ground
1. Repair open circuit or short power in harness or connectors.
Check Intermittent Incident
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. Inspection end