Automatic Transmission
DTC P0723: Output Shaft (Countershaft) Speed Sensor Intermittent FailureNOTE:
^ Before you troubleshoot, retrieve all freeze data and any on-board snapshot with the HDS, 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 to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears. Then keep the engine speed 2,000 rpm or higher.
4. Monitor the OBD STATUS for P0723 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES - Go to step 5.
NO - If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 3.
5. Turn the ignition switch to LOCK (0).
6. 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 7.
NO - Repair the connector terminals, then go to step 7.
7. Connect the output shaft (countershaft) speed sensor connector.
8. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears. Then keep the engine speed 2,000 rpm or higher.
9. Monitor the OBD STATUS for P0723 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES - Go to step 10.
NO - If the HDS indicates PASSED, troubleshooting is complete. If the HDS indicates NOT COMPLETED, go to step 8.
10. Turn the ignition switch to LOCK (0).
11. Jump the SCS line with the HDS.
12. Disconnect PCM connector B (49P).
13. Disconnect the output shaft (countershaft) speed sensor connector.
14. Check for continuity between output shaft (countershaft) speed sensor connector terminal No. 2 and body ground.
Is there continuity?
YES - Repair short to body ground in the wire between PCM connector terminal B38 and the output shaft (countershaft) speed sensor, then go to step 21.
NO - Go to step 15.
15. Connect PCM connector B (49P).
16. Turn the ignition switch to ON (II).
17. Measure the 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 21.
NO - Go to step 18.
18. Turn the ignition switch to LOCK (0).
19. Disconnect PCM connector B (49P).
20. Check for continuity between PCM connector terminal B38 and output shaft (countershaft) speed sensor connector terminal No. 2.
Is there continuity?
YES - Go to step 27.
NO - Repair open in the wire between PCM connector terminal B38 and the output shaft (countershaft) speed sensor, then go to step 21.
21. Reconnect all connectors.
22. Turn the ignition switch to ON (II).
23. Clear the DTC with the HDS.
24. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears. Then keep the engine speed 2,000 rpm or higher.
25. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0723 indicated?
YES - Check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM, then go to step 1.
NO - Go to step 26.
26. Monitor the OBD STATUS for P0723 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 25, go to the indicated DTC's troubleshooting.
NO - Check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 24.
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
29. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears. Then keep the engine speed 2,000 rpm or higher.
30. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0723 indicated?
YES - Check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 29. If the PCM was substituted, go to step 1.
NO - Go to step 31.
31. Monitor the OBD STATUS for P0723 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. If any other Temporary DTCs or DTCs were indicated in step 30, go to the indicated DTC's troubleshooting.
NO - Check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 29. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 29.
comes on).