LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 2007 >> TL Base >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> DTC P0325: Knock Sensor Circuit Malfunction
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) 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 Temporary DTCs or 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 ECM/PCM.

  6. Turn the ignition switch OFF.
  7. Jump the SCS line with the HDS.
  8. Disconnect the knock sensor subharness IP connector.
  9. Disconnect ECM/PCM connector B (24P).
  10. Check for continuity between ECM/PCM connector terminal B6 and body ground.
    Fig 1: Checking Continuity Between ECM/PCM Connector Terminal B6 And Body Ground
    G05457984Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between the ECM/PCM (B6) and the knock sensor subharness, then go to step  19.

    NO  -Go to step 11.

  11. Connect the engine wire harness 1P connector (C154) terminal to body ground with a jumper wire.
    Fig 2: Connecting Engine Wire Harness 1P Connector (C154) Terminal To Body Ground With Jumper Wire
    G05457985Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Check for continuity between ECM/PCM connector terminal B6 and body ground.
    Fig 3: Checking Continuity Between ECM/PCM Connector Terminal B6 And Body Ground
    G05457986Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 13.

    NO  -Repair open in the wire between the ECM/PCM (B6) and the knock sensor subharness, then go to step  19.

  13. Remove the intake manifold (see INTAKE MANIFOLD REMOVAL AND INSTALLATION ), and injector base (see INJECTOR BASE REMOVAL AND INSTALLATION ).
  14. Disconnect the knock sensor 1P connector.
  15. Check for continuity between the knock sensor subharness IP connector terminal and body ground.
    Fig 4: Checking Continuity Between Knock Sensor Subharness IP Connector Terminal And Body Ground
    G05457987Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the knock sensor subharness, then go to step  18.

    NO  -Go to step 16.

  16. Check for an open in the knock sensor subharness.

    Is the harness OK? 

    YES  -Go to step 17.

    NO  -Repair open in the knock sensor subharness, then go to step  19.

  17. Replace the knock sensor (see KNOCK SENSOR REPLACEMENT  ).
  18. Install the injector base (see INJECTOR BASE REMOVAL AND INSTALLATION ) and the intake manifold (see INSTALLATION ).
  19. Reconnect all connectors.
  20. Turn the ignition switch ON (II).
  21. Reset the ECM/PCM with the HDS.
  22. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  23. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
  24. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0325 indicated? 

    YES  -Check for poor connections or loose terminals at the knock sensor and the ECM/PCM, then go to step  26.

    NO  -Go to step 25.

  25. 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 Temporary DTCs or DTCs were indicated in step  24, go to the indicated DTCs troubleshooting.

    NO  -If the screen indicates FAILED, check for poor connections or loose terminals at the knock sensor and the ECM/PCM, go to step  1. If the screen indicates NOT COMPLETED, go to step  23.

  26. Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  27. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan come on, then let it idle.
  28. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
  29. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0325 indicated? 

    YES  -Check for poor connections or loose terminals at the knock sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  27. If the ECM/PCM was substituted, go to step  1.

    NO  -Go to step 30.

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

    Does the screen indicate PASSED? 

    YES  -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT  ). If any other Temporary DTCs or DTCs were indicated in step  29, go to the indicated DTCs troubleshooting.

    NO  -If the screen indicates FAILED, check for poor connections or loose terminals at the knock sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  28. If the ECM/PCM was substituted, go to step  1. If the screen indicates NOT COMPLETED, go to step  28.

scientia non olet · About LEMON Manuals