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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 75 (EGR SYSTEM)DTC TROUBLESHOOTINGDTC P0404: EGR CONTROL CIRCUIT RANGE/PERFORMANCE PROBLEM
2002 Honda Civic Si

DTC P0404: EGR Control Circuit Range/Performance Problem

2002 Honda Civic SiSECTION DTC P0404: EGR Control Circuit Range/Performance Problem
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
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. Do the EGR TEST in the INSPECTION MENU with the HDS.

    Is the test result OK? 

    1. YES  - Intermittent failure system is OK at this time. Clean any carbon build-up on the EGR valve with carburetor cleaner.
    2. NO  - Go to step 5.
  5. Turn the ignition switch OFF.
  6. Disconnect the EGR valve 6P connector.
  7. At the sensor side, measure resistance between EGR valve 6P connector terminals No. 1 and No. 2.
    Fig 1: Measuring Resistance Between EGR Valve 6P Connector Terminals No. 1 And No. 2
    G03640017Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 100 kΩ or more? 

    1. YES  - Go to step  25.
    2. NO  - Go to step 8.
  8. Measure resistance between EGR valve 6P connector terminals No. 1 and No. 3.
    Fig 2: Measuring Resistance Between EGR Valve 6P Connector Terminals No. 1 And No. 3
    G03640018Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 100 kΩ or more? 

    1. YES  - Go to step  25.
    2. NO  - Go to step 9.
  9. Check for continuity between EGR valve 6P connector terminal No. 6 and body ground.
    Fig 3: Checking Continuity Between EGR Valve 6P Connector Terminal No. 6 And Body Ground
    G03640019Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 10.
    2. NO  - Repair open in the wire between the EGR valve and G101, then go to step  26.
  10. Jump the SCS line with the HDS.
  11. Disconnect PCM connector A (73P).
  12. Check for continuity between PCM connector terminal A15 and body ground.
    Fig 4: Checking Continuity Between PCM Connector Terminal A15 And Body Ground
    G03640020Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between the PCM (A15) and the EGR valve, then go to step  26.
    2. NO  - Go to step 13.
  13. Check for continuity between PCM connector terminal A15 and EGR valve 6P connector terminal No. 4.
    Fig 5: Checking Continuity Between PCM Connector Terminal A15 And EGR Valve 6P Connector Terminal No. 4
    G03640021Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 14.
    2. NO  - Repair open in the wire between the PCM (A15) and the EGR valve, then go to step  26.
  14. Remove the EGR valve (see EGR VALVE REPLACEMENT  ).
  15. Clean the intake manifold port with carburetor cleaner. Also, clean the passage inside the EGR valve with carburetor cleaner.
  16. Install the EGR valve (see EGR VALVE REPLACEMENT  ).
  17. Reconnect the EGR valve 6P connector.
  18. Reconnect PCM connector A (73P).
  19. Turn the ignition switch ON (II).
  20. Reset the PCM with the HDS.
  21. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  22. 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.
  23. Do the EGR TEST in the INSPECTION MENU with the HDS.

    Is the result OK? 

    1. YES  - Go to step  31.
    2. NO  - Go to step 24.
  24. Turn the ignition switch OFF.
  25. Replace the EGR valve (see EGR VALVE REPLACEMENT  ).
  26. Reconnect all connectors.
  27. Turn the ignition switch ON (II).
  28. Reset the PCM with the HDS.
  29. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  30. 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.
  31. Do the EGR TEST in the INSPECTION MENU with the HDS.
  32. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P0404 is indicated, check for poor connections or loose terminals at the EGR valve and the PCM. If the connections and terminals are OK, go to step  34. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
    2. NO  - Go to step 33.
  33. Monitor the OBD STATUS for DTC P0404 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    1. YES  - Troubleshooting is complete.
    2. NO  - If the screen indicates FAILED, then go to step  1, and recheck. If the screen indicates, EXECUTING, keep the driving condition continually until a result comes on. If the screen indicates OUT OF CONDITION, go to step  31 and recheck.
  34. Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ).
  35. Do the EGR TEST in the INSPECTION MENU with the HDS.
  36. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P0404 is indicated, check for poor connections or loose terminals at the EGR valve and the PCM, then go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
    2. NO  - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ).
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.