DTC Troubleshooting
DTC P0723: Output Shaft (Countershaft) Speed Sensor Intermittent FailureNOTE:
- 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. Test-drive the vehicle for more than 10 minutes under the same conditions as those indicated by the freeze data. Slow down and stop the wheels.
3. Monitor the OBD STATUS for P0723 in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES - Go to step 4.
NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and the PCM. If the screen indicates NOT COMPLETED, return to step 2 and recheck.
4. Turn the ignition switch OFF.
5. Disconnect the output shaft (countershaft) speed sensor connector, and inspect the connector and connector terminals to be sure they are making good contact.
Are the connector terminals OK?
YES - Go to step 6.
NO - Repair the connector terminals, then go to step 6.
6. Connect the output shaft (countershaft) speed sensor connector.
7. Test-drive the vehicle for several minutes, and monitor the OBD STATUS for P0723 in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES - Go to step 8.
NO - If the screen indicates PASSED, troubleshooting is complete. If the screen indicates NOT COMPLETED, return to step 7 and recheck.
8. Turn the ignition switch OFF.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector B (24P).
11. Disconnect the output shaft (countershaft) speed sensor connector.
12. Check for continuity between output shaft (countershaft) speed sensor connector terminal No. 2 and body ground.
Is there continuity?
YES - Repair a short to body ground in the wire between PCM connector terminal B19 and the output shaft (countershaft) speed sensor connector, then go to step 20.
NO - Go to step 13.
13. Connect PCM connector B (24P).
14. Turn the ignition switch ON (II).
15. Measure voltage between output shaft (countershaft) speed sensor connector terminal No. 2 and body ground.
Is there about 5 V?
YES - Replace the output shaft (countershaft) speed sensor, then go to step 20.
NO - Go to step 16.
16. Turn the ignition switch OFF.
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector B (24P).
19. Check for continuity between PCM connector terminal B19 and output shaft (countershaft) speed sensor connector terminal No. 2.
Is there continuity?
YES - Go to step 26.
NO - Repair an open in the wire between PCM connector terminal B19 and the output shaft (countershaft) speed sensor, then go to step 20.
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Clear the DTC with the HDS.
23. Test-drive the vehicle for several minutes in the D position through all five gears.
24. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0723 indicated?
YES - Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to step 1.
NO - Go to step 25.
25. Monitor the OBD STATUS for P0723 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - Return to step 1 and recheck.
26. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
27. Test-drive the vehicle for several minutes in the D position through all five gears.
28. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0723 indicated?
YES - Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, 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 P0723 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - Return to step 1 and recheck.