DTC Troubleshooting
DTC P0957: Short in Transmission Gear Selection Switch Circuit, or 117 Transmission Gear Selection Switch Stuck ONNOTE:
^ 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. Turn the ignition switch ON (II).
2. Shift to the P position.
3. Check the SS MODE SWITCH in the DATA LIST with the HDS.
Is the SS MODE SWITCH ON?
YES - Go to step 4.
NO - Intermittent failure, the system is OK at this time. Check for intermittent short to body ground between the transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector and the PCM.
4. Turn the ignition switch OFF.
5. Disconnect the transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector.
6. Turn the ignition switch ON (II).
7. Check the SS MODE SWITCH in the DATA LIST with the HDS.
Is the SS MODE SWITCH ON?
YES - Go to step 8.
NO - Replace the transmission gear selection switch, then go to step 12.
8. Turn the ignition switch OFF.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector E (31P).
11. Check for continuity between transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector terminal No. 3 and body ground.
Is there continuity?
YES - Repair a short to body ground in the wire between PCM connector terminal E30 and the transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector, then go to step 12.
NO - Go to step 20.
12. Reconnect all connectors.
13. Turn the ignition switch ON (II).
14. Clear the DTC with the HDS.
15. Start the engine in the P position, wait for more than 10 seconds, then press the brake pedal and shift to the M position.
16. Push the shift lever toward upshift position slowly, and return to neutral position; repeat this test 10 times or more.
17. Pull the shift lever toward downshift position slowly, and return to neutral position; repeat this test 10 times or more.
18. Check for DTCs with the HDS.
Is DTC P0957 indicated?
YES - Check for intermittent short to body ground in the wire between the transmission gear selection switch and the PCM, then go to step 1.
NO - Go to step 19.
19. Monitor the OBD STATUS for P0957 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other DTCs were indicated in step 18, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for intermittent short to body ground in the wire between the transmission gear selection switch and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 15.
20. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
21. Start the engine in the P position, wait for more than 10 seconds, then press the brake pedal and shift to the M position.
22. Push the shift lever toward upshift position (+) slowly, and return to neutral position; repeat this test 10 times or more.
23. Pull the shift lever toward downshift position slowly, and return to neutral position; repeat this test 10 times or more.
24. Check for DTCs with the HDS.
Is DTC P0957 indicated?
YES - Check for intermittent short to body ground in the wire between the transmission gear selection switch and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 21. If the PCM was substituted, go to step 1.
NO - Go to step 25.
25. Monitor the OBD STATUS for P0957 in the DTCs MENU with the HDS.
Does the screen 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 in step 24, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for intermittent short to body ground in the wire between the transmission gear selection switch and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 21. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 21.