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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)/press the engine start/stop button, or while the ignition switch is in ON (II)/vehicle in ON mode. 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), or press the engine start/stop button to select the ON mode.
  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 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
    • VECHICLE SPEED
    • APP SENSOR
  6. Check for Pending or Confirmed 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), or press the engine start/stop button to select the OFF mode.
  8. Disconnect the intake air duct from the throttle body.
  9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  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), or press the engine start/stop button to select the OFF mode.
  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: Connecting Throttle Body 6P Connector Terminals No. 5 And 6 With Jumper Wire
    G08072838Courtesy 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
    G08072839Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  27.

    NO  -Repair an open in the wires between the throttle body and the PCM (C2, C3), then go to step  21.

  19. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  20. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION  ).
  21. Reconnect all connectors.
  22. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  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
    • VECHICLE SPEED
    • APP SENSOR
  26. Check for Pending or Confirmed 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 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
    • VECHICLE SPEED
    • APP SENSOR
  30. Check for Pending or Confirmed 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 are indicated, go to the indicated DTC'S TROUBLESHOOTING .

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