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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 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 Pending or Confirmed 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 Pending or Confirmed 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 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  25 and recheck. If DTC P2101 is indicated, go to step  22

    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 B (49P).
  17. Check for continuity between PCM connector terminal B33 and throttle body 6P connector terminal No 4.

    Is there continuity? 

    YES  - Go to step 18

    NO  - Repair open in the wire between the throttle body and the PCM (B33), the got to step 24  24.

    Fig 1: PCM Connector Terminal B33 And Throttle Body 6P Connector Terminal No 4
    G00511812Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Disconnect PCM connector C (49P).
  19. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
    Fig 2: Connecting Throttle Body 6P Connector Terminals No. 5 & No. 6 With Jumper Wire
    G05961302Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Check for continuity between PCM connector terminals C2 and C3.

    Is there continuity? 

    YES  - Go to step 21

    NO  - Repair open in the wires between the throttle body and the PCM (C2, C3), then go to step  24

    Fig 3: Checking Continuity Between PCM Connector Terminals C2 & C3
    G05961303Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. At the throttle body side, measure the resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle fully closed.

    Is there about 1.0kΩ or more? 

    YES  - Go to step  23

    NO  - Go to step  30

    Fig 4: Throttle Body 6P Connector Terminals No. 5 And No. 6
    G00511816Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Turn the ignition switch to LOCK (0).
  23. Replace Throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
  24. Reconnect all connectors.
  25. Turn the ignition switch to ON (II).
  26. Reset the PCM with the HDS.
  27. Do PCM IDLE LEARN PROCEDURE .
  28. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • APP SENSOR A
  29. Check for Pending or Confirmed 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 THROTTLE BODY CLEANING ), and go to step  1.

    NO  - Troubleshooting is complete. If any other Pending or Confirmed DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. ■

  30. Reconnect all connectors.
  31. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  32. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
    • ENGINE SPEED
    • VSS
    • APP SENSOR A
  33. Check for Pending or Confirmed 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. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. 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 Pending or Confirmed DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. ■

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