Control Module Communication Bus OFF - Vehicle Stability Control System (for ADVICS Made)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for ADVICS Made): U0073/94,U0100/65,U0123/62,U0124/95,U0126/63: Control Module Communication Bus OFF
U0126/63 - Lost Communication with Steering Angle Sensor Module

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC Check For Intermittent Problems.

ABS / VSC / TRAC





Result:





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

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

B -- RECONFIRM DTC
A -- Continue to next step.

2. CHECK IF EACH SENSOR AND ECM CONNECTOR IS SECURELY CONNECTED

(a) Turn the ignition switch off.

(b) 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) Turn the ignition switch off.

(b) Record the output DTCs (for ABS, VSC, and CAN communication) Vehicle Stability Control System (for ADVICS Made).

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 DTC Vehicle Stability Control System (for ADVICS Made)

A -- INSPECT CAN COMMUNICATION SYSTEM

4. REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Turn the ignition switch off.

(b) Repair or replace the harness or connector.

(c) Check for any momentary interruption between the skid control ECU and each sensor or ECM Check For Intermittent Problems.

(d) Check that there is no momentary interruption.

NEXT -- Continue to next step.

5. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTC Vehicle Stability Control System (for ADVICS Made).

(c) Start the engine.

(d) Drive the vehicle and turn the steering wheel to the right and left at a speed of 9 mph (15 km/h) or more.

(e) Check that no CAN communication system DTC is output.

(f) If ABS and VSC DTCs are output, record them.

Result:





HINT
The CAN communication system must be normal when repairing each sensor DTC (for ABS and VSC).

C -- END

B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC Vehicle Stability Control System (for ADVICS Made)

A -- INSPECT CAN COMMUNICATION SYSTEM