Diagnostic Procedure

DIAGNOSTIC TROUBLE CODE (DTC) REFERENCES
* If DTC 52 is displayed, check No.1 (front) knock sensor circuit.
* If DTC 55 is displayed, check No.2 (rear) knock sensor circuit.
* If DTC 53 is displayed, replace ECM.

DIAGNOSTIC PROCEDURE
1. CHECK NO CONTINUITY OF KNOCK SENSOR CIRCUIT.
^ If OK proceed to step 3.
^ If not OK proceed to step 2.
2. CHECK KNOCK SENSOR.
^ If OK proceed to step 3.
^ If not OK replace knock sensor.
3. CHECK FOR OPEN AND SHORT IN HARNESS AND CONNECTOR BETWEEN KNOCK SENSOR AND ECM.
^ If OK proceed to step 4.
^ If not OK repair or replace harness or connector.
4. DOES MALFUNCTION DISAPPEAR WHEN A GOOD KNOCK SENSOR IS INSTALLED?
^ If YES replace knock sensor.
^ If not OK check and replace ECM.