P1673

DTC P1673 (22): MCM Relay Stays Activated
1. Reset the MCM.
2. Turn the ignition switch ON (II) then OFF, and wait at least 1 minute. Turn the ignition switch ON (II) again.
Is DTC P1673 indicated?
YES - Go to step 3.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MCM relay and at the MCM.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF.
5. Remove the IPU lid.
6. Make sure there is less than 30 V at the junction terminals.





7. Measure voltage between MCM relay 14P connector terminal No. 3 and body ground.
Is there battery voltage?
YES - Go to step 8.
NO - Repair short in the wire between the MCM relay 1 and the MCM (A7).
8. Check the MCM relay.
Is the relay OK?
YES - Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck. If the symptom/indication goes away with a known-good MCM, replace the original MCM.
NO - Replace the MCM relayed