MPI Module Fan Keeps Running, or Always Runs at High Speed

NOTE: Information marked with an asterisk (*) applies to PDUFANH line.

1. Turn the ignition switch OFF.
2. Remove the cargo floor mat.
3. Turn the battery module switch OFF.
4. Remove the IPU lid.
5. Disconnect MCM connector A (32P).
Does the MPI module fan run?

YES - Go to step 6.
NO - Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.

6. Disconnect the low speed motor power inverter module fan control relay 4P connector and high speed motor power inverter module fan control relay 4P connector.





7. Check for continuity between body ground and MCM connector terminals A6 and A7 *.
Is there continuity?

YES - Repair short in the wire between the MCM (A6, A7 * ) and the low (high) * speed motor power inverter module fan control relay.
NO - Go to step 8.

8. Check the low (high) * speed motor inverter module fan control relay.
Is the relay OK?

YES - Repair short in the wire between the MPI module fan and high speed motor power inverter module fan control relay.

NO - Replace the low (high) * speed motor inverter module fan control relay.