DTC P0325: Knock Sensor Circuit Malfunction

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed 3,000 rpm without load (in P or N) until the radiator fan comes on.
4. Hold the engine speed between 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 1P connector (see KNOCK SENSOR REPLACEMENT ).
9. Disconnect PCM connector C (44P).
10. Check for continuity between PCM connector terminal C42 and body ground.
    Fig 1: Checking Continuity Between PCM Connector Terminal C42 And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the PCM (C42) and the knock sensor, then go to step  14.

    NO  -Go to step 11.

11. Connect the knock sensor 1P connector terminal to body ground with a jumper wire.
    Fig 2: Connecting Knock Sensor 1P Connector Terminal To Body Ground With Jumper Wire

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Check for continuity between PCM connector terminal C42 and body ground.
    Fig 3: Checking Continuity Between PCM Connector Terminal C42 And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 13.

    NO  -Repair an open in the wire between the PCM (C42) and the knock sensor, then go to step  14.

13. Replace the knock sensor (see KNOCK SENSOR REPLACEMENT ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
18. Hold the engine speed between 3,000-4,000 rpm for at least 10 seconds.
19. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0325 indicated? 

    YES  -Go to step  21.

    NO  -Go to step 20.

20. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19, go to the indicated DTC's troubleshooting.

    NO  -If the screen indicates FAILED, check for poor connections or loose terminals at the knock sensor and the PCM, then go to step  1. If the screen indicates NOT COMPLETED, go to step  18 and recheck.

21. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
22. Start the engine. Hold the engine at 3,000 rpm without load (in P or N) until the radiator fan comes on.
23. Hold the engine speed between 3,000-4,000 rpm for at least 10 seconds.
24. 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 (see SUBSTITUTING THE PCM ), then go to step  23. If the PCM was substituted, go to step  1.

    NO  -Go to step 24.

25. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS.

Does the screen indicate PASSED? 

YES  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs were indicated in step 23, go to the indicated DTC's troubleshooting.

NO  -If the screen 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 (see SUBSTITUTING THE PCM ), then go to step  23. If the PCM was substituted, go to step  1. If the screen indicates NOT COMPLETED, go to step  23.