Electronic Power Steering System

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: U0073: Control Module Communication Bus OFF

DTC U0073 - Control Module Communication Bus OFF

DTC U0105 - Lost Communication with ECM

DTC U0121 - Lost Communication with Anti-lock Brake System (ABS) Control Module

DTC U0122 - Lost Communication with Vehicle Dynamics Control Module

DTC U0130 - Lost Communication with VGRS

DESCRIPTION

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





HINT:
- When two or more DTCs starting with "U" are output simultaneously, inspect the connectors and wire harness of each ECU.
- If the power steering ECU assembly detects DTC U0121 only, it adjusts the amount of power assistance for a speed of 100 km/h (62 mph) and continues system control.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC
(a) Using the Techstream, check for DTCs.
NEXT -- GO TO CAN COMMUNICATION SYSTEM TROUBLESHOOTING