DTC Troubleshooting
DTC Troubleshooting: P0325 (23-1)
DTC P0325:
Knock Sensor Circuit Malfunction
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
4. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
5. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0325 indicated?
YES -
Go to step 6.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the knock sensor and the PCM.�
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Disconnect the knock sensor subharness 1P connector.
9. Disconnect PCM connector C (49P).
10. Check for continuity between PCM connector terminal C47 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the PCM(C47) and the knock sensor subharness, then go to step 20.
NO -
Go to step 11.
11. Connect engine wire harness (knock sensor) 1P connector terminal to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal C47 and body ground.
Is there continuity?
YES -
Go to step 13.
NO -
Repair an open in the wire between the PCM(C47) and the engine wire harness (knock sensor) connector, then go to step 20.
13. Remove the jumper wire from the engine wire harness.
14. Remove the intake manifold Intake Manifold Removal/Installation and the injector base Injector Base Removal/Installation.
15. Disconnect the knock sensor 1P connector.
16. Check for continuity between the knock sensor 1P connector terminal and body ground.
Is there continuity?
YES -
Repair a short in the knock sensor subharness, then go to step 19.
NO -
Go to step 17.
17. Check for an open in the knock sensor subharness.
Is the harness OK?
YES -
Go to step 18.
NO -
Repair an open in the knock sensor subharness, then go to step 19.
18. Replace the knock sensor Service and Repair.
19. Install the injector base Injector Base Removal/Installation and the intake manifold Intake Manifold Removal/Installation.
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure PCM Idle Learn Procedure.
24. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
25. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0325 indicated?
YES -
Check for poor connections or loose terminals at the knock sensor and the PCM, then go to step 27.
NO -
Go to step 26.
26. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 25, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the knock sensor and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 24.
27. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.
28. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
29. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
30. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0325 indicated?
YES -
Check for poor connections or loose terminals at the knock sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 28. If the PCM was substituted, go to step 1.
NO -
Go to step 31.
31. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 30, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the knock sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 28. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 28.