DTC Troubleshooting

DTC Troubleshooting: P0977 (8)

DTC P0977: Open in Shift Solenoid Valve B Circuit

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information. How to Troubleshoot A/T Systems

- This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

1. Clear the DTC with the HDS.

2. Test-drive the vehicle in 3rd or 4th gear in D for at least 1 second, then slow down to a stop.

3. Check that DTC P0977 recurs.

Is DTC P0977 indicated?
YES - Go to step 7.

NO - Go to step 4.


4. Select Shift Solenoid Valve B in the Miscellaneous Test Menu, and test shift solenoid valve B with the HDS.

Is a clicking sound heard?
YES - Go to step 5.

NO - Go to step 7.


5. Test-drive the vehicle in 3rd or 4th gear in D for at least 1 second, then slow down to a stop.

6. Monitor the OBD status for P0977 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate FAILED?
YES - Go to step 7.

NO - If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between shift solenoid valve B and the PCM. If the HDS indicates NOT COMPLETED, go to step 4.


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

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector C (49P).

10. Measure the resistance between PCM connector terminals C28 and C41.

Is there 12-25 Ohms?
YES - Go to step 15.

NO - Go to step 11.






11. Disconnect the shift solenoid harness connector.

12. Check for continuity between PCM connector terminal C28 and shift solenoid harness connector terminal No. 4.

Is there continuity?
YES - Go to step 13.

NO - Repair open in the wire between PCM connector terminal C28 and the shift solenoid harness connector, then go to step 20.






13. Remove the shift solenoid harness. A/T Shift Solenoid Valve Test/Replacement

14. Check for continuity between shift solenoid harness connector terminal No. 4 and the shift solenoid valve B connector terminal.

Is there continuity?
YES - Replace shift solenoid valve B, A/T Shift Solenoid Valve Test/Replacement then go to step 20.

NO - Replace the shift solenoid harness, A/T Shift Solenoid Valve Test/Replacement then go to step 20.






15. Connect PCM connector C (49P).

16. Update the A/T software in the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. Initial Inspection and Diagnostic Overview

17. Start the engine in P, and wait for at least 1 second, then test-drive the vehicle in D. Drive the vehicle in 3rd or 4th gear for at least 1 second, then slow down to a stop.

18. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0977 indicated?
YES - If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview then recheck. If the PCM was substituted, go to step 1.

NO - Go to step 19.


19. Monitor the OBD status for P0977 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?
YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other DTCs were indicated on step 18, go to the indicated DTC's troubleshooting.

NO - If the HDS indicates FAILED, check for poor connections and loose terminals between shift solenoid valve B and the PCM. If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview then recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 17.


20. Reconnect all connectors.

21. Clear the DTC with the HDS.

22. Start the engine in P, and wait for at least 1 second, then test-drive the vehicle in D. Drive the vehicle in 3rd or 4th gear for at least 1 second, then slow down to a stop.

23. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0977 indicated?
YES - Check for poor connections and loose terminals between shift solenoid valve B and the PCM, then go to step 1.

NO - Go to step 24.


24. Monitor the OBD status for P0977 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?
YES - Troubleshooting is complete. If any other DTCs were indicated on step 23, go to the indicated DTC's troubleshooting.

NO - If the HDS indicates FAILED, check for poor connections and loose terminals between shift solenoid valve B and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 22.