1. Check Knock Sensor Input Signal Circuit For Open And Short-I

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check resistance between ECM terminal 15 and engine ground.

   Refer to WIRING DIAGRAM.

   NOTE: It is necessary to use an ohmmeter which can measure more than 10 MΩ.
   1. Resistance: Approximately 532 - 588 kΩ [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.