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DTC P2101: ETCS Malfunction

CAUTION: Do not insert your fingers into the installed throttle body when you turn the ignition switch to ON (II) or while the ignition switch is ON (II). If you do, you will seriously injure your fingers if the throttle valve is activated.
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 to ON (II).
  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? 

    YES  - Go to step  7.

    NO  - Go to step 5.

  5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • APP SENSOR
  6. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P2101 indicated? 

    YES  - Go to step 7.

    NO  - Intermittent failure, the 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 AIR CLEANER REMOVAL/INSTALLATION ).

  7. Turn the ignition switch to LOCK (0).
  8. Disconnect the intake air duct from the throttle body.
  9. Turn the ignition switch to 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.

    Does the throttle valve operate smoothly? 

    YES  - Clean the throttle body (see AIR CLEANER REMOVAL/INSTALLATION ), then go to step  22 and recheck. If DTC P2101 is indicated, go to step  19.

    NO  - Go to step 13.

  13. Turn the ignition switch to LOCK (0).
  14. Disconnect the throttle body 6P connector.
  15. Jump the SCS line with the HDS.
  16. Disconnect PCM connector C (49P).
  17. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
    Fig 1: Identifying Throttle Body 6P Connector Terminals With Jumper Wire
    G05523916Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Check for continuity between PCM connector terminals C2 and C3.
    Fig 2: Identifying Continuity Between PCM Connector Terminals
    G05523917Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  26.

    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 to LOCK (0).
  20. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
  21. Reconnect all connectors.
  22. Turn the ignition switch to ON (II).
  23. Reset the PCM with the HDS.
  24. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  25. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • APP SENSOR
  26. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P2101 indicated? 

    YES  - Check for poor connections or loose terminals at the throttle body and the PCM, then clean the throttle body (see AIR CLEANER REMOVAL/INSTALLATION ), and go to step  1.

    NO  - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .

  27. Reconnect all connectors.
  28. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  29. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • APP SENSOR
  30. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P2101 indicated? 

    YES  - Check for poor connections or loose terminals at the throttle body and the PCM, then clean the throttle body (see AIR CLEANER REMOVAL/INSTALLATION ). If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  29. If the PCM was substituted, go to step  1.

    NO  - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .

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