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Home >> Acura >> 2009 >> CSX Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Electronic Throttle Control System >> DTC Troubleshooting >> DTC P2101: Electronic Throttle Control System (ETCS) Malfunction

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 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 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 the ECM/PCM, then clean the throttle body (see THROTTLE BODY CLEANING ).

  7. Turn the ignition switch OFF.
  8. Disconnect the air intake duct from the throttle body (see step 3 on REMOVAL-K20Z2 ).
  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.

    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 OFF.
  14. Disconnect the throttle body 6P connector.
  15. Jump the SCS line with the HDS.
  16. Disconnect ECM/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 5 And 6 With Jumper Wire
    G06265833Courtesy 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
    G06265834Courtesy 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 OFF.
  20. Replace the throttle body; K20Z2 engine (see THROTTLE BODY REMOVAL/INSTALLATION ), K20Z3 engine (see K20Z3 ENGINE ).
  21. Reconnect all connectors.
  22. Turn the ignition switch 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
  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 UPDATING THE ECM/PCM ), 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
  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  29. 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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