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 The A/T System.
- 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 shift lever in P. Press the brake pedal, shift to R, and wait for at least 1 second.
4. Check for Pending or Confirmed 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 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 shift lever in P. Press the brake pedal, 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 5.
8. Turn the ignition switch to LOCK (0).
9. Check for a blown No. 31 (15 A) fuse in the driver's under-dash fuse/relay box.
Is the No. 31 (15 A) fuse OK?
YES -
Go to step 10.
NO -
Replace the fuse, then go to step 21. If the fuse blows again, go to step 8.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector C (49P).
12. Measure the resistance between PCM connector terminal C20 and body ground.
Is there less than 12 Ohms?
YES -
Go to step 13.
NO -
Go to step 25.
13. Disconnect the shift solenoid wire harness connector.
14. Check for continuity between PCM connector terminal C20 and body ground.
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 19.
NO -
Go to step 15.
15. Inspect shift solenoid valve A Shift Solenoid Valve Test, Replacement, and Shift Solenoid Wire Harness Replacement.
Is shift solenoid valve A OK?
YES -
Go to step 16.
NO -
Replace shift solenoid valve A Shift Solenoid Valve Test, Replacement, and Shift Solenoid Wire Harness Replacement, then go to step 22.
16. Disconnect PCM connector A (49P).
17. Turn the ignition switch to ON (II).
18. Measure the voltage between PCM connector terminals A1 and body ground.
Is there battery voltage?
YES -
Go to step 25.
NO -
Repair open in the wire between PCM connector terminal A1 and the driver's under-dash fuse/relay box, then go to step 19.
19. Reconnect all connectors.
20. Turn the ignition switch to ON (II).
21. Clear the DTC with the HDS.
22. Start the engine with the shift lever in P. Wait for at least 1 second, then press the brake pedal, shift to R, and wait for at least 1 second.
23. Check for Pending or Confirmed 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 24.
24. 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 Pending or Confirmed DTCs were indicated in step 23, 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 22.
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Initial Inspection and Diagnostic Overview.
27. Start the engine with the shift lever in P. Wait for at least 1 second, then press the brake pedal, shift to R, and wait for at least 1 second.
28. Check for Pending or Confirmed 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 Initial Inspection and Diagnostic Overview, then go to step 27. If the PCM was substituted, go to step 1.
NO -
Go to step 29.
29. 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 Pending or Confirmed DTCs were indicated in step 28, 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 Initial Inspection and Diagnostic Overview, then go to step 27. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 27.