P1673

DTC P1673 (22): Motor Control Module (MCM) Relay Stays Activated
1. Turn the ignition switch ON (II).
2. Reset the MCM
3. Turn the ignition switch ON (II) and then OFF. Then wait at least 30 seconds, and turn the ignition switch ON (II) again.
4. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1673 indicated?
YES - Go to step 5.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MCM relay and the MCM.

5. Turn the ignition switch OFF.
6. Turn the battery module switch OFF.
7. Remove the IPU lid.
8. Disconnect MCM connector B (24P).
9. Check for continuity between body ground and MCM connector terminal B15.





Is there continuity?
YES - Repair short in the wire between MCM relay 1 and the MCM (B15), then go to step 11
NO - Go to step 10.

10. Check the MCM relay.
Is the relay OK?
YES - Go to step 18.
NO - Replace the MCM relay, then go to step 11.

11. Turn the ignition switch OFF.
12. Reconnect all connectors.
13. Reinstall the IPU lid, then turn the battery module switch ON.
14. Turn the ignition switch ON (II).
15. Reset the MCM.
16. Turn the ignition switch ON (II) and then OFF. Then wait at least 30 seconds, and turn the ignition switch ON (II) again.
17. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1673 is indicated, check for poor connections or loose terminals at the MCM relay 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.

18. Reinstall the IPU lid, then turn the battery module switch ON.
19. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
20. Turn the ignition switch ON (II) and then OFF. Then wait at least 30 seconds, and turn the ignition switch ON (II) again.
21. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1673 is indicated, check for poor connections or loose terminals at the MCM relay 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 - If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM.