DTC U0073/86 Control Module Communication Bus OFF; DTC U0100/85 Lost Communication with ECM / PCM "A"; DTC U0129/83 Lost Communication with Brake System Control Module: Description

The AWD control 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 DETECTION CONDITION CHART

DTC No.

DTC Detection Condition

Trouble Area

U0073/86

When the following continues for 5 seconds or more:
- Signals from the AWD 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

U0100/85

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 60 km/h (38 mph) or more, communication with the ECM cannot be performed.

CAN communication system

U0129/83

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