DTC U0073/86: Control Module Communication Bus OFF; DTC U0100/85: Lost Communication with ECM / PCM "A"; DTC U0129/83: Lost Communication with Brake System Control Module: Procedure

1. Check for DTC. Refer to DTC CHECK / CLEAR .
2. Record the output DTC (4WD control system).

   HINT: 

   When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

NEXT → See step   2