Diagnosis & Repair
- Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Disconnect EC1 connector. EC1 connector is a wire-to-wire connector located in engine compartment, near idle air control valve. Connector is a Dark Gray 4-pin connector.
- Connect a jumper wire between terminal No. 1 of male connector to terminal No. 2 of female connector. Connect another jumper wire between terminal No. 2 of male connector to terminal No. 1 of female connector. See Fig 1. Turn ignition on. Clear trouble codes. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM in the INTRODUCTION section. Start and warm engine to normal operating temperature.
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- Snap accelerate engine 3 times. Retrieve trouble codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article. If same code is repeated as before, go to next step. If code has changed, go to step 5).
- Check for open or short circuit(s) between EC1 connector and ECM harness connector. Repair as necessary. If circuits are okay, replace ECM and retest system.
- Check for open or short circuit(s) between EC1 connector and knock sensor. If DTC P0325 has changed to DTC P0330, check knock sensor circuit on right bank. If DTC P0330 changed to DTC P0325, check knock sensor circuit on left bank. Repair as necessary. If harness is okay, replace knock sensor.