DTC U0100/41: Lost Communication with ECM/PCM "A"; DTC U0129/42: Lost Communication with Brake System Control Module: Procedure

RECONFIRM DTC
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check for DTCs. Refer to DTC CHECK / CLEAR .
  OK
  
  DTC U0100/41 or U0129/43 is not output.
NG → See step 3

OK → See step 2
CHECK FOR INTERMITTENT PROBLEMS. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE
GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING