P0715
DTC P0715: A Problem in Mainshaft Speed Sensor CircuitNOTE: Record all freeze data 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 Flowchart for the TP sensor. Recheck for code P07 15 after troubleshooting.
NO - Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect PCM connector A (31P).
5. Check for continuity between PCM connector terminals A23 and body ground, and between A24 and body ground.
Is there continuity?
YES - Go to step 6.
NO - Repair open in the wires between PCM connector terminals A23 and ground (G101), between A24 and ground (G101), and repair poor ground (G101).
6. Connect PCM connector A (31P).
7. Disconnect the mainshaft speed sensor connector.
8. Turn the ignition switch ON (II).
9. 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 10.
NO - Go to step 19.
10. Turn the ignition switch OFF.
11. 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 12.
12. Check for continuity between the No. 3 terminal of the mainshaft speed sensor connector and body ground.
Is there continuity?
YES - Go to step 13.
NO - Repair open in the wire between the mainshaft speed sensor connector and ground (G101).
13. Turn the ignition switch ON (II).
14. Measure the voltage between the No. 2 and No. 3 terminals of the mainshaft speed sensor connector.
Is there 5 V?
YES - Go to step 15.
NO - Go to step 23.
15. Connect the mainshaft speed sensor connector.
16. 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 17.
NO - Replace the mainshaft speed sensor.
17. Shift to P position. Start the engine, and let it idle.
18. 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.
19. 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 20.
20. Turn the ignition switch OFF.
21. Disconnect PCM connector A (31P).
22. 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.
NO - 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.
23. 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 - 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.