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DTC P2101: Electronic Throttle Control System (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 A
  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 the ECM/PCM, then clean the throttle body (see THROTTLE BODY CLEANING )

  7. Turn the ignition switch to LOCK (0)
  8. Disconnect the intake air duct from the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION )
  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 THROTTLE BODY CLEANING ), 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 ECM/PCM connector C (49P)
  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 No 6 With Jumper Wire
    G05992401Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Check for continuity between ECM/PCM connector terminals C3 and C4
    Fig 2: Checking Continuity Between ECM/PCM Connector Terminals C3 And C4
    G05992402Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  27

    NO  -Repair open in the wires between the throttle body and the ECM/PCM (C3, C4), then go to step  21

  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 ECM/PCM with the HDS
  24. Do the ECM/PCM idle learn procedure (see ECM/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 A
  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 ECM/PCM, then clean the throttle body (see THROTTLE BODY CLEANING ), 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 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 )
  29. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters
    • ENGINE SPEED
    • VSS
    • APP SENSOR A
  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 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

    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 Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting

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