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P0715

DTC P0715: A Problem in Mainshaft Speed Sensor Circuit

NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot.

Code P0715 (15) doesn't always mean there's an electrical problem in the mainshaft or countershaft speed sensor circuit; code P0715 (15) may also indicate a mechanical problem in the transmission. Any problem causing irregular countershaft-to-mainshaft speed difference can cause this code.
1. Turn the ignition switch ON (II).
2. Check whether the OBD II scan tool indicates the code for the throttle position (TP) sensor.
Does the OBD II scan tool indicate the code for the TP sensor?
YES - Perform the troubleshooting for the TP sensor. Recheck for code P0715 after troubleshooting.
NO - Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect the battery negative terminal.
5. Disconnect PCM connector A (31P).





6. Check for continuity between PCM connector terminals A23 and body ground, and between A24 and body ground.
Is there continuity?
YES - Go to step 7.
NO - Repair open in the wires between PCM connector terminals A23 and ground (G101), between A24 and ground (G101), and repair poor ground (G101).
7. Connect PCM connector A (31P).
8. Connect the battery negative terminal.
9. Disconnect the mainshaft speed sensor connector.
10. Turn the ignition switch ON (II).





11. Measure the voltage between the No. 1 terminal of the mainshaft speed sensor connector and body ground.
Is there about 5 V?
YES - Go to step 12.
NO - Go to step 23.
12. Turn the ignition switch OFF.
13. Disconnect PCM connector C (22P).





14. Check for continuity between the No. 2 terminal of the mainshaft speed sensor connector and body ground.
Is there continuity?
YES - Repair short to ground in the wire between PCM connector terminal C7 and mainshaft speed sensor connector.
NO - Go to step 15.





15. Check for continuity between the No. 3 terminal of the mainshaft speed sensor connector and body ground.
Is there continuity?
YES - Go to step 16.
NO - Repair open in the wire between the mainshaft speed sensor connector and ground (G101).
16. Connect the PCM connector C (22P).
17. Turn the ignition switch ON (II).





18. Measure the voltage between the No. 2 and No. 3 terminals of the mainshaft speed sensor connector.
Is there about 5 V?
YES - Go to step 19.
NO - Go to step 28.
19. Connect the mainshaft speed sensor connector.





20. Measure the voltage between PCM connector terminals C7 and A23 or A24.
Is the voltage 0 V or about 5 V?
YES - Go to step 21.
NO - Replace the mainshaft speed sensor.
21. Shift to the 1 position. Start the engine, and let it idle.





22. With engine idling, measure the voltage between PCM connector terminals C7 and A23 or A24.
Is there 1.5 V 3.5 V?
YES - Update the PCM if it does not have the latest software or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.
NO - Replace the mainshaft speed sensor.





23. Measure the voltage between PCM connector terminal A20 and A23 or A24.
Is there 4.75 V - 5.25 V?
YES - Repair open in the wire between PCM connector terminal A20 and the mainshaft speed sensor connector.
NO - Go to step 24.
24. Turn the ignition switch OFF.
25. Disconnect the battery negative terminal.
26. Disconnect PCM connector A (31P).





27. Check for continuity between PCM connector A20 and body ground.
Is there continuity?
YES - Repair short to ground in the wire between PCM connector terminal A20 and the mainshaft speed sensor connector.

NOTE: A short to ground on this circuit will damage the PCM cause a TP sensor DTC.

NO - Check the terminal fit at PCM connector terminal A20. If the connection is OK, update the PCM if it does not have the latest software or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.





28. Measure the voltage between PCM connector terminal C7 and A23 or A24.
Is there about 5 V?
YES - Repair open in the wire between PCM connector C7 and the mainshaft speed sensor connector.
NO - Check the terminal fit at PCM connector terminal C7. If the connection is OK, update the PCM if it does not have the latest software or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.


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