DTC Troubleshooting
DTC P0715: Input Shaft (Mainshaft) Speed Sensor Circuit MalfunctionNOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
1. Start the engine, and let it idle.
2. Check the M SHAFT SPD in the DATA LIST with the HDS.
Is any input shaft (mainshaft) speed indicated?
YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM.
NO - Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect the input shaft (mainshaft) speed sensor 3P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminal No. 1 and body ground.
Is there about 5 V?
YES - Go to step 7.
NO - Repair open in the wire between the ECM (C14) and the input shaft (mainshaft) speed sensor, then go to step 16.
7. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminal No. 2 and body ground.
Is there about 5 V?
YES - Go to step 8
NO - Go to step 9.
8. Measure voltage between input shaft (mainshaft) speed sensor 3P connector terminals No. 1 and No. 3.
Is there about 5 V?
YES - Go to step 14.
NO - Repair open in the wire between the ECM (C12) and the input shaft (mainshaft) speed sensor, then go to step 16.
9. Measure voltage between ECM connector terminal D8 and body ground.
Is there about 5 V?
YES - Repair open in the wire between the ECM (D8) and the input shaft (mainshaft) speed sensor, then go to step 16.
NO - Go to step 10.
10. Turn the ignition switch OFF.
11. Jump the SCS line with the HDS.
12. Disconnect ECM connector D (17P).
13. Check for continuity between ECM connector terminal D8 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (D8) and the input shaft (mainshaft) speed sensor, then go to step 16.
NO - Go to step 22.
14. Turn the ignition switch OFF.
15. Replace the input shaft (mainshaft) speed sensor.
16. Reconnect all connectors.
17. Turn the ignition switch ON (II).
18. Reset the ECM with the HDS.
19. Do the ECM idle learn procedure.
20. Test-drive under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
- Transmission in 3rd gear
- Engine speed at 2,000 - 3,000 rpm
- Drive for several minutes
21. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0715 indicated?
YES - Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM, then go to step 1.
NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
22. Reconnect all connectors.
23. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
24. Test-drive under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
- Transmission in 3rd gear
- Engine speed at 2,000 - 3,000 rpm
- Drive for several minutes
25. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0715 indicated?
YES - Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM. If the ECM was updated, substitute a known-good ECM, then go to step 24. If the ECM was substituted, go to step 1.
NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.