Dtc U0073 Control Module Communication Bus Off

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Power Steering. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC

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.

DTC No.
DTC Detection Item
Inspection Area
U0073
CAN communication error (CAN bus is off)
CAN communication system
U0105
ECM communication error
  1. CAN communication system
  2. ECM (when only U0105 is output)
U0121
Skid control ECU communication error
  1. CAN communication system
  2. Skid control ECU (when only U0121 is output)
U0122
Skid control ECU communication error.
  1. Skid control ECU
  2. CAN communication system
U130
Steering control ECU communication error.
  1. Steering control ECU
  2. CAN communication system
HINT:
  1. When two or more DTCs starting with "U" are output simultaneously, inspect the connectors and wire harness of each ECU.
  2. 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.

INSPECTION PROCEDURE

1.CHECK DTC

  1. Using the intelligent tester, check for DTCs.


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