DTC U0073/86: Control Module Communication Bus OFF; 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: Description

The 4WD control ECU inputs the signals sent from the ECM, skid control ECU, and steering angle 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.	DTC Detecting Condition	Trouble Area
U0073/86	When the following continues for 5 seconds or more: Signals from the 4WD control ECU are not received. When the following occurs 10 times consecutively: A communication malfunction (bus off) occurs one or more times within 0.1 second.	Wire harness (CANL, CANH circuit) 4WD control ECU
U0100/85	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 38 mph (60 km/h) or more, communication with the ECM cannot be performed continue for 2 seconds or more.	Wire harness (CANL, CANH circuit) 4WD control ECU ECM
U0126/84	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 cannot be performed. When both 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 cannot be performed occurs once within 5 seconds.	Wire harness (CANL, CANH circuit) 4WD control ECU Steering angle sensor
U0129/83	When both of the following continue for 3 seconds or more: The voltage of the IG1 terminal is 10 V or more. Communication with the skid control ECU cannot be performed.	Wire harness (CANL, CANH circuit) 4WD control ECU Skid control ECU