Control Module Communication Bus OFF - Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: U0073/94: Control Module Communication Bus OFF

DTC U0073/94 - Control Module Communication Bus OFF

DTC U0100/65 - Lost Communication with ECM / PCM

DTC U0123/62 - Lost Communication with Yaw Rate Sensor Module

DTC U0124/95 - Lost Communication with Lateral Acceleration Sensor Module

DTC U0126/63 - Lost Communication with Steering Angle Sensor Module

DESCRIPTION





INSPECTION PROCEDURE

The skid control ECU inputs the signals from the ECM, steering angle sensor, and yaw rate and acceleration sensor via CAN communication system.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
(a) Using the Data List of Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC .

ABS / VSC / TRAC:





Result:





HINT: Perform the above inspection before removing the sensor and connector.

C -- REPAIR OR REPLACE HARNESS AND CONNECTOR
B -- RECONFIRM DTC
A -- Continue to next step.
2. CHECK IF EACH SENSOR AND ECM CONNECTOR IS SECURELY CONNECTED
(a) Check if each sensor or ECM connector is securely connected.
OK:
The connector should be securely connected.
NG -- CONNECT CONNECTOR TO EACH SENSOR OR ECM CORRECTLY
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Record the output DTCs (for ABS, VSC and CAN communication) .
HINT: If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS and VSC) after the CAN communication system returns to normal.

Result





C -- USE SIMULATION METHOD TO CHECK
B -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A -- INSPECT CAN COMMUNICATION SYSTEM
4. REPAIR OR REPLACE HARNESS AND CONNECTOR
(a) Repair or replace the harness or connector.
(b) Check for any momentary interruption between the skid control ECU and each sensor or ECM .
(c) Check that there is no momentary interruption.
NEXT -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTC .
(b) Turn the ignition switch ON.
(c) Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 mph) or more.
(d) Check that no CAN communication system DTC is output .
(e) If ABS and/or VSC DTCs are output, record them.

Result





HINT: The CAN communication system must be normal when repairing the sensor DTCs (for ABS and VSC).

C -- END
B -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A -- INSPECT CAN COMMUNICATION SYSTEM