P0718
DTC P0718: Input Shaft (Mainshaft) Speed Sensor Intermittent FailureNOTE:
^ Before you troubleshoot, record 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 at speeds over 12 mph (20 km/h).
4. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 3, then go to step 5.
5. Monitor the OBD STATUS for P0718 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES - Go to step 6.
NO - If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the input shaft (mainshaft) speed sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 3.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the input shaft (mainshaft) 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 8.
NO - Repair the connector terminals, then go to step 8.
8. Connect the input shaft (mainshaft) speed sensor connector.
9. 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).
10. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 9, then go to step 11.
11. Monitor the OBD STATUS for P0718 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES - Go to step 12.
NO - If the HDS indicates PASSED, troubleshooting is complete. If the HDS indicates NOT COMPLETED, go to step 9.
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector C (44P).
15. Check for continuity between PCM connector terminal C40 and body ground, and between terminal C44 and body ground.
Is there continuity?
YES - Go to step 16.
NO - Repair open in the wires between PCM connector terminals C40, C44, and ground (G 101), or repair poor ground (G 101), then go to step 32.
16. Connect PCM connector C (44P).
17. Disconnect the input shaft (mainshaft) speed sensor connector.
18. Turn the ignition switch to ON (II).
19. Measure the voltage between input shaft (mainshaft) speed sensor connector terminal No. 1 and body ground.
Is thereabout 5 V?
YES - Go to step 20.
NO - Go to step 29.
20. Turn the ignition switch to LOCK (0).
21. Disconnect PCM connector B (44P),
22. Check for continuity between input shaft (mainshaft) 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 B17 and the input shaft (mainshaft) speed sensor, then go to step 32.
NO - Go to step 23.
23. Connect PCM connector B (44P).
24. Turn the ignition switch to ON (II).
25. Measure the voltage between input shaft (mainshaft) speed sensor connector terminal No. 2 and body ground.
Is thereabout 5 V?
YES - Replace the input shaft (mainshaft) speed sensor, then go to step 32.
NO - Go to step 26.
26. Turn the ignition switch to LOCK (0).
27. Disconnect PCM connector B (44P).
28. Check for continuity between PCM connector terminal B17 and input shaft (mainshaft) speed sensor connector terminal No. 2.
Is there continuity?
YES - Go to step 39.
NO - Repair open in the wire between PCM connector terminal B17 and the input shaft (mainshaft) speed sensor, then go to step 32.
29. Turn the ignition switch to LOCK (0).
30. Disconnect PCM connector B (44P).
31. Check for continuity between PCM connector terminal B18 and input shaft (mainshaft) speed sensor connector terminal No. 1.
Is there continuity?
YES - Go to step 32.
NO - Repair open in the wire between PCM connector terminal B18 and the input shaft (mainshaft) speed sensor, then go to step 32.
32. Reconnect all connectors.
33. Turn the ignition switch to ON (II).
34. Clear the DTC with the HDS.
35. Test-drive the vehicle with the shift ]ever in D, and let the transmission shift through all five gears at speeds over 12 mph (20 km/h).
36. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 35, then go to step 37.
37. Check for DTCs with the HDS.
Is DTC P0718 indicated?
YES - Check for poor connections or loose terminals between the input shaft (mainshaft) speed sensor and the PCM, then go to step 1.
NO - Go to step 38.
38. Monitor the OBD STATUS for P0718 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES - Troubleshooting is complete. If any other DTCs were indicated in step 37, go to the indicated DTC's troubleshooting.
NO - If the HDS indicates FAILED, check for poor connections or loose terminals between the input shaft (mainshaft) speed sensor and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 35.
39. Update the PCM if it does not have the latest software, or substitute a known good PCM.
40. 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).
41. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 40, then go to step 42.
42. Check for DTCs with the HDS.
Is DTC P0718 indicated?
YES - Check for poor connections or loose terminals between the input shaft (mainshaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 40. If the PCM was substituted, go to step 1.
NO - Go to step 43.
43. Monitor the OBD STATUS for P0718 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 DTCs were indicated in step 42, go to the indicated DTC's troubleshooting.
NO - If the HDS indicates FAILED, check for poor connections or loose terminals between the input shaft (mainshaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 40. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 40.