DTC U0100-85: Lost Communication with ECM / PCM "A"; DTC U0126-84: Lost Communication with Steering Angle Sensor Module; DTC U0129-83: Lost Communication with Brake System Control Module [10/2014 - 05/2019]: Description

The 4WD ECU assembly inputs the signals sent from the ECM and skid control ECU (brake actuator assembly), and steering sensor via the CAN communication system.
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U0100/85	Lost Communication with ECM / PCM "A"	When both of the following continue for 2 seconds or more: The voltage of the IG1 terminal is 10 V or more. At a vehicle speed of 60 km/h (38 mph) or more, communication with the ECM cannot be performed.	CAN communication system 4WD ECU assembly ECM
U0126/84	Lost Communication with Steering Angle Sensor Module	When both of the following continue for 1 second or more: The voltage of the IG1 terminal is 10 V or more. Communication with the steering sensor cannot be performed. When all of the following occur 10 times consecutively: The voltage of the IG1 terminal is 10 V or more. The condition that controls communication with the steering sensor cannot be performed occurs once within 5 seconds. Occurs 10 times or more within 60 seconds.	CAN communication system 4WD ECU assembly Steering sensor
U0129/83	Lost Communication with Brake System Control Module	When the following continues for 3 seconds or more: The voltage of the IG1 terminal is 10 V or more. Communication with the skid control ECU (brake actuator assembly) cannot be performed.	CAN communication system 4WD ECU assembly Skid control ECU (Brake actuator assembly)