## 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