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DTC P0404: EGR Control Circuit Range/Performance Problem

NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .
  • Information marked with an asterisk (*1) applies to '09-10 models and '11-12 models (M/T).
  • Information marked with an asterisk (*2) applies to '11-12 models (A/T).
  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 (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  4. Do the EGR TEST in the INSPECTION MENU with the HDS.

    Is the result OK? 

    YES:  Intermittent failure, the system is OK at this time. Clean any carbon build-up on the EGR valve with throttle plate cleaner.

    NO:  Go to step  5.

  5. Turn the ignition switch to LOCK (0).
  6. Disconnect the EGR valve 5P connector.
  7. At the EGR valve side, measure the resistance between EGR valve 5P connector terminals No. 2 and No. 3.
    Fig 1: Checking Resistance Between EGR Valve 5P Connector Terminals No. 2 & No. 3
    G05953210Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 100 kΩ or more? 

    YES  Go to step  24.

    NO  Go to step  8.

  8. At the EGR valve side, measure the resistance between EGR valve 5P connector terminals No. 2 and No. 4.
    Fig 2: Checking Resistance Between EGR Valve 5P Connector Terminals No. 2 & No. 4
    G05953211Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 100 kΩ or more? 

    YES:  Go to step  24.

    NO:  Go to step  9.

  9. Check for continuity between EGR valve 5P connector terminal No. 5 and body ground.
    Fig 3: Checking Continuity Between EGR Valve 5P Connector Terminal No. 5 & Body Ground
    G05953212Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES:  Go to step  10.

    NO:  Repair open in the wire between the EGR valve and G101, then go to step  25.

  10. Jump the SCS line with the HDS.
  11. Disconnect ECM/PCM connector B (49P).
  12. Check for continuity between ECM/PCM connector terminal B2 and body ground.
    Fig 4: Checking Continuity Between ECM/PCM Connector Terminal B2 & Body
    G05953213Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES:  Repair short in the wire between the ECM/PCM (B2) and the EGR valve, then go to step  25.

    NO:  Go to step  13.

  13. Check for continuity between ECM/PCM connector terminal B2 and EGR valve 5P connector terminal No. 1.
    Fig 5: Checking Continuity Between ECM/PCM Connector Terminal B2 & EGR Valve 5P Connector Terminal No. 1
    G05953214Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES:  Go to step  14.

    NO:  Repair open in the wire between the ECM/PCM (B2) and the EGR valve, then go to step  25.

  14. Remove the EGR valve (see EGR PIPE REMOVAL AND INSTALLATION  ).
  15. Clean any carbon build-up on the EGR valve with throttle plate cleaner.
  16. Install the EGR valve (see EGR PIPE REMOVAL AND INSTALLATION  ).
  17. Reconnect all connector.
  18. Turn the ignition switch to ON (II).
  19. Reset the ECM/PCM with the HDS.
  20. Do ECM/PCM IDLE LEARN PROCEDURE .
  21. Start the engine. Hold the engine speed at 3, 000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  22. Do the EGR TEST in the INSPECTION MENU with the HDS.

    Is the result OK? 

    YES:  Go to step  31.

    NO:  Go to step  23.

  23. Turn the ignition switch to LOCK (0).
  24. Replace the EGR valve (see EGR VALVE REPLACEMENT  .
  25. Reconnect all connectors.
  26. Turn the ignition switch to ON (II).
  27. Reset the ECM/PCM with the HDS.
  28. Do ECM/PCM IDLE LEARN PROCEDURE .
  29. Start the engine. Hold the engine speed at 3, 000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  30. Do the EGR TEST in the INSPECTION MENU with the HDS.
  31. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0404 indicated? 

    YES:  Check for poor connections or loose terminals at the EGR valve and the ECM/PCM, then go to step  1. If the connections and terminals are OK, go to step  32.

    NO:  Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

  32. Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  33. Start the engine. Hold the engine speed at 3, 000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  34. Do the EGR TEST in the INSPECTION MENU with the HDS.
  35. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0404 indicated? 

    YES:  Check for poor connections or loose terminals at the EGR valve 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  33. If the ECM/PCM was substituted, go to step  1.

    NO:  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 Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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