DTC 01

DTC Troubleshooting
DTC 1: Power Command Signal Circuit Low Input
1. Reset the MCM.
2. Turn the ignition switch ON (II).
Is DTC 1 indicated?
YES- Go to step 3.
NO- Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECM and at the MCM.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF.
5. Remove the IPU lid.





6. Check for continuity between body ground and MCM connector terminal C2.
Is there continuity?
YES- Go to step 7.
NO- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
7. Disconnect MCM connector C (31P).





8. Check for continuity between body ground and MCM connector terminal C2.
Is there continuity?
YES- Go to step 9.
NO- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
9. Disconnect ECM connector D (16P).





10. Check for continuity between body ground and MCM connector terminal C2.
Is there continuity?
YES- Repair short in the wire between the MCM (C2) and the ECM (D8).
NO- Substitute a known-good ECM and recheck. If the symptom/indication goes away, replace the original ECM.