P0715

DTC P0715: Problem in mainshaft Speed Sensor Circuit

NOTE:
- Record all freeze data before you troubleshoot.
- Code P0715 (15) on the PCM 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. Check the mainshaft and countershaft speed sensor installation.
Are the mainshaft and countershaft speed sensor installed properly?
YES - Go to step 2.
NO - Reinstall and rechecks
2. Disconnect the mainshaft speed sensor 2P connector.





3. Measure mainshaft speed sensor resistance at the sensor connector.
Is the resistance 400 - 600 ohms?
YES - Go to step 4.
NO - Replace the mainshaft speed sensor.
4. Disconnect PCM connector D (16P).





5. Check for continuity between body ground and the D11 terminal and D12 terminal individually.
Is there continuity?
YES - Repair short to ground in the wires between the D11 and D12 terminals and the mainshaft speed sensor.
NO - Go to step 6.
6. Connect the mainshaft speed sensor connector.





7. Measure the resistance between the D11 and D12 terminals.
Is the resistance 400 - 600 ohms?
YES - Run the Electrical Troubleshooting Flowchart for code P0720 (code 9). Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck.
NO - Go to step 8.
8. Disconnect the mainshaft speed sensor 2P connector.





9. Check for continuity between the D11 terminal and the No. 1 terminal of the mainshaft speed sensor connector.
Is there continuity?
YES - Go to step 10.
NO - Repair open in the wire between the D11 terminal and the mainshaft speed sensor.





10. Check for continuity between the D12 terminal and the No. 2 terminal of the mainshaft speed sensor connector.
Is there continuity?
YES - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and rechecked
NO - Repair open in the wire between the D12 terminal and the mainshaft speed sensor.