Power Steering System

POWER STEERING: POWER STEERING SYSTEM: U0073,U0100,U0129: Control Module Communication Bus OFF

DTC U0073 - Control Module Communication Bus OFF

DTC U0100 - Lost Communication with ECM / PCM "A"

DTC U0129 - Lost Communication with Brake System 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 U0100 is output, first erase the DTCs. Then turn the ignition switch from off to on (IG). If DTC U0100 is not output again, there is no malfunction.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.
NG -- GO TO CAN COMMUNICATION SYSTEM
OK -- CHECK INTERMITTENT PROBLEMS