DTC Troubleshooting

DTC Troubleshooting: P0973 (7)

DTC P0973: Short in Shift Solenoid Valve A Circuit

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, 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. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. With the brake pedal pressed, shift to R, and wait for at least 1 second.

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

Is DTC P0973 indicated?
YES - Go to step 8.

NO - Go to step 5.


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

Is a clicking sound heard?
YES - Go to step 6.

NO - Go to step 8.


6. Start the engine. With the brake pedal pressed, shift to R, and wait for at least 1 second.

7. Monitor the OBD status for P0973 in the DTCs MENU with the HDS.

Does the HDS indicate FAILED?
YES - Go to step 8.

NO - If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for intermittent short to body ground in the wire between shift solenoid valve A and the PCM. If the HDS indicates NOT COMPLETED, go to step 6.


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

9. Jump the SCS line with the HDS.

10. Disconnect PCM connectors B (49P) and C (49P).

11. Measure the resistance between PCM connector terminals C20 and B41 or C41.

Is there less than 12 Ohms?
YES - Go to step 12.

NO - Go to step 26.






12. Disconnect the shift solenoid wire harness connector.

13. Check for continuity between PCM connector terminals C20 and B41 or C41.

Is there continuity?
YES - Repair short to body ground in the wire between PCM connector terminal C20 and the shift solenoid wire harness connector, then go to step 20.

NO - Go to step 14.






14. Inspect shift solenoid valve A. A/T Shift Solenoid Valve Test, Replacement, and Shift Solenoid Wire Harness Replacement

Is shift solenoid valve A OK?
YES - Go to step 15.

NO - Replace shift solenoid valve A or the shift solenoid wire harness, A/T Shift Solenoid Valve Test, Replacement, and Shift Solenoid Wire Harness Replacement then go to step 23.


15. Disconnect PCM connector A (49P).

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

17. Measure the voltage between PCM connector terminals A1 and B41 or C41.

Is there battery voltage?
YES - Go to step 26.

NO - Go to step 18.






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

19. Check for continuity between PCM connector terminals B41 and body ground, and between C41 and body ground.

Is there continuity?
YES - Check for a blown No. 10 (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between PCM connector terminal A1 and the under-dash fuse/relay box, then go to step 20.

NO - Repair open in the wires between PCM connector terminals B41, C41, and body ground (G101), or repair poor body ground (G101), then go to step 20.






20. Reconnect all connectors.

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

22. Clear the DTC with the HDS.

23. Start the engine in P. With the brake pedal pressed, shift to the R, and wait for at least 1 second, then move the shift lever back into P.

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

Is DTC P0973 indicated?
YES - Check for intermittent short to body ground in the wire between shift solenoid valve A and the PCM, then go to step 1.

NO - Go to step 25.


25. Monitor the OBD status for P0973 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 24, go to the indicated DTC's troubleshooting.

NO - If the HDS indicates FAILED, check for intermittent short to body ground in the wire between shift solenoid valve A and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 23.


26. Reconnect all connectors.

27. Update the PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good PCM. How to Troubleshoot A/T Systems

28. Start the engine in P. With the brake pedal pressed, shift to the R, and wait for at least 1 second, then move the shift lever back into P.

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

Is DTC P0973 indicated?
YES - Check for intermittent short to body ground in the wire between shift solenoid valve A and the PCM. If the PCM was updated, substitute a known-good PCM, How to Troubleshoot A/T Systems then go to step 28. If the PCM was substituted, go to step 1.

NO - Go to step 30.


30. Monitor the OBD status for P0973 in the DTCs MENU with the HDS.

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 Temporary DTCs or DTCs were indicated in step 29, go to the indicated DTC's troubleshooting.

NO - If the HDS indicates FAILED, check for intermittent short to body ground in the wire between shift solenoid valve A and the PCM. If the PCM was updated, substitute a known-good PCM, How to Troubleshoot A/T Systems then go to step 28. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 28.