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Home >> Acura >> 2009 >> TL Base >> Repair and Diagnosis >> Engine Performance >> System >> Electronic Throttle Control System >> DTC Troubleshooting >> DTC P2176: Throttle Actuator Control System Idle Position Not Learned

DTC P2176: Throttle Actuator Control System Idle Position Not Learned

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 )
  • If DTC P2135 is stored at the same time as DTC P2176, troubleshoot DTC P2135 first, then recheck for DTC P2176
  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. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 10 seconds
  5. Check for Pending or Confirmed DTCs with the HDS

    6. Is DTC P2176 indicated? 

    YES  -Go to step 6

    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 )

  6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  7. Disconnect the intake air duct from the throttle body
  8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
  9. Clear the DTC with the HDS
  10. Visually check the throttle valve operation while performing the ETCS TEST in the INSPECTION MENU with the HDS

    11. Does the throttle valve move to its fully closed position? 

    YES  -Go to step 11

    NO  -Go to step  12

  11. Check for sludge or carbon on the throttle valve

    12. Is there sludge or carbon on the throttle valve? 

    YES  -Clean the throttle body (see THROTTLE BODY CLEANING ), then go to step  21

    NO  -Go to step  18

  12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  13. Disconnect the throttle body 6P connector
  14. Jump the SCS line with the HDS
  15. Disconnect PCM connector C (49P)
  16. 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
    G05987523Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Check for continuity between PCM connector terminals C2 and C3
    Fig 2: Checking Continuity Between PCM Connector Terminals C2 And C3
    G05987524Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  28

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

  18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  19. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION )
  20. Reconnect all connectors
  21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
  22. Reset the PCM with the HDS
  23. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE )
  24. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 10 seconds
  26. Check for Pending or Confirmed DTCs with the HDS

    27. Is DTC P2176 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 ECM/PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM )
  29. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  30. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 10 seconds
  31. Check for Pending or Confirmed DTCs with the HDS

    Is DTC P2176 indicated? 

    YES  -Check for poor connections or loose terminals at throttle body and the PCM If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 29 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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