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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 137 (ELECTRONIC THROTTLE CONTROL SYSTEM)DTC TROUBLESHOOTINGDTC P2101: ELECTRONIC THROTTLE CONTROL SYSTEM (ETCS) MALFUNCTION
2002 Honda Civic Si

DTC P2101: Electronic Throttle Control System (ETCS) Malfunction

2002 Honda Civic SiSECTION DTC P2101: Electronic Throttle Control System (ETCS) Malfunction
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
  1. Record all freeze data and any on-board snapshot with the HDS.
  2. Clear the DTC with the HDS.
  3. Do the ETCS TEST in the INSPECTION MENU with the HDS.
  4. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P2101 indicated? 

    1. YES  - Go to step  7.
    2. NO  - Go to step  5.
  5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • Engine speed
    • Vehicle speed
    • Accelerator position
  6. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P2101 indicated? 

    1. YES  - Go to step  7.
    2. NO  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle body and at the PCM, then clean the throttle body (see THROTTLE BODY CLEANING ).
  7. Turn the ignition switch OFF.
  8. Disconnect the intake air duct from the throttle body.
  9. Turn the ignition switch ON (II).
  10. Clear the DTC with the HDS.
  11. Do the ETCS TEST in the INSPECTION MENU with the HDS.
  12. Visually check the throttle valve operation.
    NOTE: Be careful not to pinch your fingers during the check.

    Does the throttle valve operate smoothly? 

    1. YES  - Clean the throttle body (see THROTTLE BODY CLEANING ), then go to step  21 and recheck. If DTC P2101 is indicated, go to step  19.
    2. NO  - Go to step  13.
  13. Turn the ignition switch OFF.
  14. Disconnect the throttle body 6P connector.
  15. Jump the SCS line with the HDS.
  16. Disconnect PCM connector C (44P).
  17. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
    Fig 1: Connecting Throttle Body 6P Connector Terminals No. 5 And 6 With Jumper Wire
    G03704419Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Check for continuity between PCM connector terminals C2 and C3.
    Fig 2: Checking Continuity Between PCM Connector Terminals C2 And C3
    G03704420Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step  26.
    2. NO  - Repair open in the wires between the throttle body and the PCM (C2, C3), then go to step  20.
  19. Turn the ignition switch OFF.
  20. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
  21. Turn the ignition switch ON (II).
  22. Reset the PCM with the HDS.
  23. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  24. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • Engine speed
    • Vehicle speed
    • Accelerator position
  25. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P2101 is indicated, check for poor connections or loose terminals at the throttle body and the PCM, then clean the throttle body (see THROTTLE BODY CLEANING ), and go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
    2. NO  - Troubleshooting is complete.
  26. Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ).
  27. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P2101 is indicated, check for poor connections or loose terminals at the throttle body and the PCM, then clean the throttle body (see THROTTLE BODY CLEANING ), and 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.
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