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 knock sensor 1P connector.

6.Disconnect the ECM/PCM connector A (31P).

7.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  knock sensor.n


NO - Go to 8.

8.Connect the knock sensor 1P connector terminal No. 1 to body ground with a jumper wire.

 

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

 

Is there continuity?


YES - Go to 10.


NO - Repair open in the wire between the ECM/ PCM (A9) and the  knock sensor.n


10.Substitute a known-good knock sensor and recheck.

Is DTC P0325 indicated?


YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.n


NO - Replace the original  knock sensor.n