Lexus LX - Page 209

DTC U0100/56 Lost Communication with ECM / PCM "A"
DTC U0122/56 Lost Communication with Vehicle Dynamics Control Module
DTC U0126/56 Lost Communication with Steering Angle Sensor Module
for Preparation Click here
DESCRIPTION
The steering control ECU receives signals from the skid control ECU, ECM and steering angle sensor via CAN communication. When DTCs indicating a
CAN communication system malfunction are output, repair the CAN communication system first.
DTC Code DTC Detection Condition Trouble Area
U0100/56
The steering control ECU detects an error in reception (from ECM)
via CAN communication.
CAN communication system
ECM
U0122/56
The steering control ECU detects an error in reception (from skid
control ECU) via CAN communication.
CAN communication system
Skid control ECU
U0126/56
The steering control ECU detects an error in reception (from steering
angle sensor) via CAN communication.
CAN communication system
Steering angle sensor
INSPECTION PROCEDURE
1.CHECK DTC
a. Using the intelligent tester, check if the CAN communication system is functioning normally ( Click here for LHD, Click here for RHD).
Result
Result Proceed to
DTC is not output A
DTC is output (for LHD) B
DTC is output (for RHD) C
B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED
WITH TROUBLESHOOTING) (Click here)
C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED
WITH TROUBLESHOOTING) (Click here)
A
USE SIMULATION METHOD TO CHECK ( Click here)