Automatic Transmission
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 with the shift lever in D, and let the transmission shift through all five gears at speeds over 12 mph (20 km/h) for several minutes. Slow down and stop the wheels.
3. Turn the ignition switch to LOCK (0). Repeat step 2, then go to step 4.
4. Monitor the OBD STATUS for P0723 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate FAILED?
3 5.
NO - 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 HDS indicates NOT COMPLETED, return to step 2 and recheck.
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 at speeds over 12 mph (20 km/h) for several minutes. Slow down and stop the wheels.
9. Turn the ignition switch to LOCK (0). Repeat step 8, then go to step 10.
10. Monitor the OBD STATUS for P0723 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate FAILED?
YES - Go to step 11.
NO - Troubleshooting is complete. If the HDS indicates NOT COMPLETED, return to step 8 and recheck.
11. Turn the ignition switch to LOCK (0).
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector C (44P).
14. Check for continuity between PCM connector terminals C40 and body ground, and between C44 and body ground.
Is there continuity?
YES - Go to step 15.
NO - Repair open in the wires between PCM connector terminals C40, C44 and ground (G101), or repair poor ground (G101), then go to step 37.
15. Connect PCM connector C (44P).
16. Disconnect the output shaft (countershaft) speed sensor connector.
17. Turn the ignition switch to ON (II).
18. Measure the voltage between output shaft (countershaft) speed sensor connector terminal No. 1 and body ground.
Is there about 5 V?
YES - Go to step 19.
NO - Go to step 28.
19. Turn the ignition switch to LOCK (0).
20. Disconnect PCM connector C (44P).
21. Check for continuity between output shaft (countershaft) speed sensor connector terminal No. 2 and body ground.
Is there continuity?
YES - Repair short in the wire between PCM connector terminal C43 and the output shaft (countershaft) speed sensor connector, then go to step 37.
NO - Go to step 22.
22. Connect PCM connector C (44P).
23. Turn the ignition switch to ON (II).
24. 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 37.
NO - Go to step 25.
25. Turn the ignition switch to LOCK (0).
26. Disconnect PCM connector C (44P).
27. Check for continuity between PCM connector terminal C43 and output shaft (countershaft) speed sensor connector terminal No. 2.
Is there continuity?
YES - Reconnect all connectors, then go to step 32.
NO - Repair open in the wire between PCM connector terminal C43 and the output shaft (countershaft) speed sensor, then go to step 37.
28. Turn the ignition switch to LOCK (0).
29. Disconnect PCM connector B (44P).
30. Check for continuity between PCM connector terminal B18 and output shaft (countershaft) speed sensor connector terminal No. 1.
Is there continuity?
YES - Go to step 31.
NO - Repair open in the wire between PCM connector terminal B18 and the output shaft (countershaft) speed sensor, then go to step 37.
31. Check for continuity between PCM connector terminal B18 and body ground.
Is there continuity?
YES - Repair short in the wire between PCM connector terminal B18 and the output shaft (countershaft) speed sensor, then go to step 37.
NO - Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and the PCM. If the connections are OK, reconnect all connectors, then go to step 32.
32. Update the A/T software in the PCM if it does not have the latest software, or substitute a known-good PCM.
33. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears at speeds over 12 mph (20 km/h) for several minutes.
Slow down and stop the wheels.
34. Turn the ignition switch to LOCK (0). Repeat step 33, then go to step 35.
35. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.
Is DTC P0723 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 36.
36. Monitor the OBD STATUS for P0723 in the DTCs/Freeze Data in Mode Menu for a pass/fail.
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 DTCs were indicated on step 35, go to the indicated DTC's troubleshooting.
NO - Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor 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 33 and recheck.
37. Reconnect all connectors.
38. Clear the DTC with the HDS.
39. Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears at speeds over 12 mph (20 km/h) for several minutes. Slow down and stop the wheels.
40. Turn the ignition switch to LOCK (0). Repeat step 39, then go to step 41.
41. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.
Is DTC P0723 indicated?
YES - Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to step 1.
NO - Go to step 42.
42. Monitor the OBD STATUS for P0723 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate PASSED?
YES - Troubleshooting is complete. If any other DTCs were indicated on step 41, go to the indicated DTC's troubleshooting.
NO - Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, return to step 39 and recheck.