ACTIVE TORQUE CONTROL 4WD SYSTEM, Diagnostic DTC:U0073, U0100, U0129

DTC Code	DTC Name
U0073	Control Module Communication Bus Off
U0100	Lost Communication with ECM / PCM "A"
U0129	Lost Communication with Brake System Control Module

DESCRIPTION

The 4WD ECU inputs the signals sent from the ECM and skid control ECU 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 Detection Condition	Trouble Area
U0073	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 seconds.	CAN communication system
U0100	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
U0129	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 cannot be performed.	CAN communication system

INSPECTION PROCEDURE

PROCEDURE

CHECK FOR DTC
1. Check for DTCs Click here.
2. Record the output DTCs (4WD control system).
  
  Tech Tips
  
  When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.
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GO TO CAN COMMUNICATION SYSTEM Click here