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DTC P0325: Knock Sensor Circuit Malfunction Honda Pilot II

Testing & Diagnostics 4 illustrations ~816 words

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .

Scheme 113

Scheme 113: DTC P0325: Knock Sensor Circuit Malfunction
Scheme 113: DTC P0325: Knock Sensor Circuit Malfunction

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Scheme 116
  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 sub-harness 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 short in the wire between the PCM (C47) and the knock sensor sub-harness, then go to step 20 . NO - Go to step 11 .
  11. Connect the engine wire harness 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 open in the wire between the PCM (C47) and the knock sensor sub-harness, then go to step 20 .
  13. Remove the jumper wire from the knock sensor sub-harness.
  14. Remove the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(ref-333554-S11195159552009072100000) ), and the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(ref-333554-S03885112412009072100000) ).
  15. Disconnect the knock sensor 1P connector.
  16. Check for continuity between the knock sensor sub-harness 1P connector terminal and body ground. Is there continuity? YES - Repair short in the knock sensor sub-harness, then go to step 19 . NO - Go to step 17 .
  17. Check for an open in the knock sensor sub-harness. Is the harness OK? YES - Go to step 18 . NO - Repair open in the knock sensor sub-harness, then go to step 19 .
  18. Replace the knock sensor (see «KNOCK SENSOR REPLACEMENT»(ref-333558-S30778413552009072100000) ).
  19. Reinstall the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(ref-333554-S03885112412009072100000) ), and the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(ref-333554-S11195159552009072100000) ).
  20. Reconnect all connectors.
  21. Turn the ignition switch to ON (II).
  22. Reset the PCM with the HDS.
  23. Do «PCM IDLE LEARN PROCEDURE»(ref-333561-S36442749152009072100000) .
  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 (see «PCM UPDATE»(ref-333558-S24141467512009072100000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-333557-S35070474232009072100000) ).
  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 (see «SUBSTITUTING THE PCM»(ref-333557-S35070474232009072100000) ), 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 (see «PCM REPLACEMENT»(ref-333558-S09775742392009072100000) ). 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 (see «SUBSTITUTING THE PCM»(ref-333557-S35070474232009072100000) ), then go to step 28 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, go to step 28 .

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