Automatic Transmission
DTC P0973: Short in Shift Solenoid Valve A CircuitNOTE:
^ Before you troubleshoot, record all freeze data and any on board snapshot, and review General Troubleshooting Information.
^ 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. Start the engine, and the brake pedal pressed with shifting from P to R.
3. Check then DTC P0973 recurs.
Is DTC P0973 indicated?
YES - Go to step 7.
NO - Go to step 4.
4. Select Shift Solenoid A in the Miscellaneous Test Menu, and test shift solenoid valve A with the HDS.
Is a clicking sound heard?
YES - Go to step 5.
NO - Go to step 7.
5. Start the engine, and the brake pedal pressed with shifting from P to R.
6. Monitor the OBD STATUS for P0973 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate FAILED?
YES - Go to step 7.
NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check the SH A wire for an intermittent short to ground between shift solenoid valve A and the PCM. If the HDS indicates NOT COMPLETED, return to step 4 and recheck.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connectors B (49P) and C (49P).
10. Measure the resistance between PCM connector terminals C20 and C41 or B41.
Is there less than 12 Ohms?
YES - Go to step 11.
NO - Go to step 19.
11. Disconnect the shift solenoid harness connector.
12. Check for continuity between PCM connector terminals C20 and C41 or B41.
Is there continuity?
YES - Repair short in the wire between PCM connector terminal C20 and the shift solenoid harness connector, then go to step 24.
NO - Go to step 13.
13. Inspect shift solenoid valve A.
Is shift solenoid valve A OK?
YES - Go to step 14.
NO - Replace shift solenoid valve A or the shift solenoid harness, then go to step 18.
14. Disconnect PCM connector A (49P).
15. Turn the ignition switch to ON (II).
16. Measure the voltage between PCM connector terminals Al and B41 or C41.
Is there battery voltage?
YES - Go to step 19.
NO - Go to step 17.
17. Turn the ignition switch to LOCK (0).
18. 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 fuse in the under dash fuse/relay box. If the fuse is OK, repair open in the wire between PCM connector terminal Al and the under-dash fuse/relay box, then go to step 24.
NO - Repair open in the wires between PCM connector terminals B41, C41 and ground (G101), or repair poor ground (G101), then go to step 24.
19. Reconnect all connectors.
20. Update the A/T software in the PCM if it does not have the latest software, or substitute a known-good PCM:
21. Start the engine, and shift to R.
22. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.
Is DTC P0973 indicated?
YES - If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
NO - Go to step 23.
23. Monitor the OBD STATUS for P0973 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate PASSED?
YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other DTCs were indicated on step 22, go to the indicated DTC's troubleshooting.
NO - If the HDS indicates FAILED, check for poor connections and loose terminals at shift solenoid valve A and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, return to step 21 and recheck.
24. Clear the DTC with the HDS.
25. Start the engine, and shift to R.
26. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.
Is DTC P0973 indicated?
YES - Check for poor connections and these terminals at shift solenoid valve A and the PCM, then go to step 1.
NO - Go to step 27.
27. Monitor the OBD STATUS for P0973 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate PASSED?
YES - Troubleshooting is complete. If any other DTCs were indicated on step 26, go to the indicated DTC's troubleshooting.
NO - If the HDS indicates FAILED, check for poor connections and loose terminals at shift solenoid valve A and the PCM, then go to stop 1. If the HDS indicates NOT COMPLETED, return to step 25 and recheck.