DTC Troubleshooting

DTC Troubleshooting: P2176

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) or while the ignition switch is in 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. Reading and Clearing Diagnostic Trouble Codes

- If DTC P2135 or P2552 is stored at the same time as DTC P2176, troubleshoot DTC P2135 or P2552 first, then recheck for DTC P2176.

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Turn the ignition switch to LOCK (0).

4. Turn the ignition switch to ON (II), and wait 10 seconds.

5. Check for Pending or Confirmed DTCs with the HDS.

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 throttle actuator control module, then clean the throttle body. Procedures


6. Turn the ignition switch to LOCK (0).

7. Disconnect the intake air duct from the throttle body.

8. Turn the ignition switch to ON (II).

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.

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.

Is there sludge or carbon on the throttle valve?
YES - Clean the throttle body, Procedures then go to step 22 and recheck.

NO - Go to step 19.


12. Turn the ignition switch to LOCK (0).

13. Disconnect the throttle body 6P connector.

14. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.

15. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.






16. Check for continuity between C251 connector (13P) terminals No. 6 and No. 13.

Is there continuity?
YES - Go to step 17.

NO - Repair open in the wires between the throttle body and the C251 connector (motor drive lines), then go to step 21.






17. Disconnect the throttle actuator control module 16P connector. Service and Repair

18. Check for continuity between throttle actuator control module 16P connector terminal No. 1 and C251 connector (13P) terminal No. 13, and then between throttle actuator control module 16P connector terminals No. 8 and C251 connector (13P) terminal No. 6.

Is there continuity?
YES - Go to step 28.

NO - Repair open in the wires between the throttle actuator control module and the C251 connector (motor drive lines), then go to step 21.






19. Turn the ignition switch to LOCK (0).

20. Replace the throttle body. Removal and Replacement

21. Reconnect all connectors.

22. Turn the ignition switch to ON (II).

23. Reset the PCM with the HDS.

24. Do the PCM idle learn procedure. PCM Idle Learn Procedure

25. Turn the ignition switch to LOCK (0).

26. Turn the ignition switch to ON (II), and wait 10 seconds.

27. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2176 indicated?
YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then clean the throttle body, Removal and Replacement 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.


28. Reconnect all connectors.

29. Update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. Reading and Clearing Diagnostic Trouble Codes

30. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2176 indicated?
YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. If the PCM was updated, substitute a known-good PCM, Reading and Clearing Diagnostic Trouble Codes 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. Service and Repair If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.