DTC 38

DTC 38: Motor Driver Module (MDM) Overheating Signal Circuit Problem
1. Reset the MCM.
2. Turn the ignition switch ON (II).
Is DTC 33 indicated?
YES- Go to step 3.
NO- Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the voltage converter module and at the MCM.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF.
5. Remove the IPU lid.
6. Turn the ignition switch ON (II).





7. Measure voltage between MCM connector terminals A13 and A24.
Is there about 5 V?
YES- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
NO- Go to step 8.
8. Turn the ignition switch OFF.





9. Check for continuity between MCM connector terminal A13 and the body ground.
Is there continuity?
YES- Go to step 10.
NO- Go to step 14.
10. Disconnect the power converter wire harness 24P connector.





11. Check for continuity between MCM connector terminal A13 and body ground.
Is there continuity?
YES- Go to step 12.
NO- Check for short in the wire between the power converter harness 24P connector and the voltage converter module. If the wire is OK, replace the voltage converter module.
12. Disconnect MCM connector A (32P).





13. Check for continuity between MCM connector terminal A13 and body ground.
Is there continuity?
YES- Repair short in the wire between the power converter wire harness 24P connector and the MCM (A13).
NO- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
14. Disconnect the power converter wire harness 24P connector.





15. Connect power converter wire harness 24P connector terminal No. 23 to body ground with a jumper wire.





16. Check for continuity between MCM connector terminal A13 and body ground.
Is there continuity?
YES- Check for an open in the wire between the power converter wire harness 24P connector and the voltage converter module. If the wire is OK, replace the voltage converter module.
NO- Repair open in the wire between the power converter wire harness 24P connector and the MCM (A13).