Problem in Mainshaft Speed Sensor Circuit - M/T Model

DTC P0715: Problem in Mainshaft Speed Sensor Circuit - M/T Model

1. Turn the ignition switch OFF.




2. Check for continuity between ECM connector terminal A25 and body ground.

Is there continuity?

YES - Go to step 3.

NO - Repair open in the wire between ECM connector terminal A25 and body ground (G101).

3. Disconnect the mainshaft speed sensor connector.
4. Turn the ignition switch ON (II).




5. Measure voltage between mainshaft speed sensor 3P connector terminal No.1 and body ground.

Is there about 5 V?

YES - Go to step 6.

NO - Go to step 15.

6. Turn the ignition switch OFF.




7. Check for continuity between mainshaft speed sensor 3P connector terminal No.2 and body ground.

Is there continuity?

YES - Repair short in the wire between ECM connector terminal B7 and the mainshaft speed sensor connector.

NO - Go to step 8.




8. Check for continuity between mainshaft speed sensor 3P connector terminal No.3 and body ground.

Is there continuity?

YES - Go to step 9.

NO - Repair open in the wire between the mainshaft speed sensor connector and the ECM (A25).

9. Turn the ignition switch ON (II).




10. Measure voltage between mainshaft speed sensor 3P connector terminals No.2 and No.3.

Is there about 5 V?

YES - Go to step 11.

NO - Go to step 19.

11. Connect the mainshaft speed sensor 3P connector.




12. Measure voltage between ECM connector terminals B7 and A25.

Is there 0 V to about 5 V?

YES - Go to step 13.

NO - Replace the mainshaft speed sensor.

13. Start the engine, and let it idle.




14. Measure voltage between ECM connector terminals B7 and A25.

Is there 1.5 - 3.5 V?

YES - Check for loose terminal fit in the ECM connectors. If necessary, substitute a known-good ECM and recheck.

NO - Replace the mainshaft speed sensor.




15. Measure voltage between ECM connector terminals A25 and A31.

Is there 4.75 - 5.25 V?

YES - Repair open in the wire between ECM connector terminal A31 and the mainshaft speed sensor connector.

NO - Go to step 16.

16. Tune the ignition switch OFF.
17. Disconnect ECM connector A (31P).




18. Check for continuity between ECM connector terminal A31 and body ground.

Is there continuity?

YES - Repair short to ground in the wire between ECM connector terminal A31 and the mainshaft speed sensor connector.

NO - Check for loose terminal fit in the ECM connectors. If necessary, substitute a known-good ECM and recheck.





19. Measure voltage between ECM connector terminals B7 and A25.

Is there about 5 V?

YES - Repair open in the wire between ECM connector B7 and the mainshaft speed sensor connector.

NO - Check for loose terminal fit in a ECM connectors. If necessary, substitute a known-good ECM and recheck.