DTC U0073/86, U0100/85, U0126/84, U0129/83; Control Module Communication Bus OFF [12/2012 - ]: Description

The 4WD ECU assembly inputs the signals sent from the ECM and skid control ECU (brake actuator assembly), and steering angle sensor (spiral with sensor cable sub-assembly) 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
U0073/86	Control Module Communication Bus OFF	When the following continues for 5 seconds or more: Signals from the 4WD ECU assembly are not received. When the following occurs 10 times consecutively: A communication malfunction (bus off) occurs one or more times within 0.1 seconds.	CAN communication system 4WD ECU assembly
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 angle sensor (spiral with sensor cable sub-assembly) 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 communication with the steering angle sensor (spiral with sensor cable sub-assembly) cannot be performed occurs once within 5 seconds. Occurs 10 times or more within 60 seconds.	CAN communication system 4WD ECU assembly Steering angle sensor (Spiral with sensor cable sub-assembly)
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)