Test M: DTC B1143 - Excessive Battery Contactor Close Requests

PINPOINT TEST M: DTC B1143 - EXCESSIVE BATTERY CONTACTOR CLOSE REQUESTS

M1:

M1 Cont'd:

M2 - M4:

Normal Operation

When the key is turned to the ON position the PCM sends a request to the battery control module (BCM) over the controller area network (CAN) communication link to close the high-voltage traction battery (HVTB) contactors. If the PCM sends multiple requests (100 requests in 4 minutes or less) to the BCM DTC B1143 is set in the BCM.


Possible Causes
- Rapid key cycling/excessive contactor close requests
- CAN communication link
- PCM
- TBCM