DTC Troubleshooting: P0325 (23-1)

DTC P0325 (23-1):  Malfunction in Knock Sensor Circuit

1.Reset the ECM/PCM.

2.Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.

3.Hold the engine at 3,000-4,000 rpm (min-1) for at least 60 seconds.

Is DTC P0325 indicated?


YES - Go to 4.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the  knock sensor and at the  ECM/ PCM.


4.Turn the ignition switch OFF.

5.Disconnect the starter sub-harness 6P connector.

6.Check for continuity between ECM/PCM connector terminal A9 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the  ECM/ PCM (A9) and the starter sub-harness 6P connector.n


NO - Go to 7.

7.Connect starter sub-harness 6P connector terminal No. 5 to body ground with a jumper wire.

 

8.Check for continuity between body ground and ECM/ PCM connector terminal A9.

 

Is there continuity?


YES - Go to 9.


NO - Repair open in the wire between the  ECM/ PCM (A9) and the starter sub-harness 6P connector.n


9.Check the starter sub-harness between 6P connector and the knock sensor for an open or short. If it's OK, substitute a known-good knock sensor and recheck.

Is DTC P0325 indicated?


YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original  ECM/ PCM.n


NO - Replace the original  knock sensor and/or starter sub-harness.n