P0725

DTC P0725 (43): Engine Speed Input Circuit Malfunction
1. Turn the ignition switch ON (II).
2. Check for Temporary DTCs or DTCs of PGM-FI system with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - Go to the indicated DTC's troubleshooting.
NO - Go to step 3.

3. Reset the MCM.
4. Start the engine, and hold it at 2,000 rpm for 5 seconds.
5. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0725 indicated?
YES - Go to step 6.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the PCM and the MCM.

6. Turn the ignition switch OFF.
7. Turn the battery module switch OFF.
8. Remove the IPU lid.
9. Disconnect MCM connector B (24P).
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector B (24P).
12. Check for continuity between MCM connector terminal B21 and body ground,





Is there continuity?
YES - Repair short in the wire between the PCM (B14) and the MCM (B211), then go to step 15.
NO - Go to step 13.

13. Connect PCM connector terminal B14 to body ground with a jumper wire.





14. Check for continuity between MCM connector terminal B21 and body ground.





Is there continuity?
YES - Go to step 22.
NO - Repair open in the wire between the PCM (B14) and the MCM (B21), then go to step 15.

15. Turn the ignition switch OFF.
16. Reconnect all connectors.
17. Reinstall the IPU lid, then turn the battery module switch ON.
18. Turn the ignition switch ON (II).
19. Reset the MCM.
20. Start the engine, and hold it at 2,000 rpm for 5 seconds.
21. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0725 is indicated, check for poor connections or loose terminals at the PCM and the MCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.

22. Reinstall the IPU lid, then turn the battery module switch ON.
23. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
24. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0725 is indicated, check for poor connections or loose terminals at the MCM, then update the PCM if it does not have the latest software, or substitute a known-good PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM.