Control Module Communication Bus Off - Electronic Power Steering System

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: U0073/49: Control Module Communication Bus Off

DTC U0073/49 - Control Module Communication Bus Off

DTC U0105/41 - Lost Communication with Fuel Injector Control Module

DTC U0121/42 - Lost Communication with Anti-Lock Brake System (ABS) Control Module

DESCRIPTION

The power steering ECU receives signals from the ECM and the skid control ECU via the CAN communication system.





HINT:
- When 2 or more DTCs starting with [U] are output simultaneously, inspect the connectors and wire harness of each ECU.
- If DTC U0105/41 is output, first erase the DTCs. Then turn the ignition switch from OFF to ON. If DTC U0105/41 is not output again, there is no malfunction.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. RECONFIRM DTC
(a) Check for DTC.
OK:
DTC is not output.
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- GO TO CAN COMMUNICATION SYSTEM