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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 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

    5. 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 Pending or Confirmed DTCs with the HDS

    7. 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 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

    13. Does the throttle valve operate smoothly? 

    YES  -Clean the throttle body (see THROTTLE BODY CLEANING ), then go to step  24 and recheck If DTC P2101 is indicated, go to step 22

    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 B (49P)
  17. Check for continuity between PCM connector terminal B33 and throttle body 6P connector terminal No 4
    Fig 1: Checking Continuity Between PCM Connector Terminal B33 And Throttle Body 6P Connector Terminal No 4
    G05987488Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 18.

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

  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 And No 6 With Jumper Wire
    G05987489Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Check for continuity between PCM connector terminals C2 and C3
    Fig 3: Checking Continuity Between PCM Connector Terminals C2 And C3
    G05987490Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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

  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
    Fig 4: Measuring Resistance Between Throttle Body 6P Connector Terminals No 5 And No 6
    G05987491Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 1 0 k Ω or more? 

    YES  -Go to step  23

    NO  -Go to step  30

  22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  23. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION )
  24. Reconnect all connectors
  25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
  26. Reset the PCM with the HDS
  27. Do the PCM idle learn procedure (see 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
  29. Check for Pending or Confirmed DTCs with the HDS

    30. 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

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

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