B -- REPLACE TCM See: Powertrain Management/Transmission Control Systems/Relays and Modules - Transmission and
Drivetrain/Relays and Modules - A/T/Control Module/Service and Repair/U660F Automatic Transaxle/Removal
A -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal
Up to 08/2009
MF1A TRANSFER / 4WD / AWD: ACTIVE TORQUE CONTROL 4WD SYSTEM: U0073,U0100,U0129: Control Module
Communication Bus Off
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.
INSPECTION PROCEDURE
PROCEDURE
1. CHECK FOR DTC
(a) Check for DTCs See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Reading and Clearing Diagnostic Trouble
Codes.
(b) Record the output DTCs (4WD control system).
HINT
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before
repairing each corresponding sensor.
NEXT -- GO TO CAN COMMUNICATION SYSTEM See: Diagnostic Trouble Code Descriptions/CAN Communication System
From 08/2009
MF1A TRANSFER / 4WD / AWD: ACTIVE TORQUE CONTROL 4WD SYSTEM: U0073,U0100,U0129: Control Module
Communication Bus Off
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
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