Vehicle Stability Control System (Hydraulic Brake Booster)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): 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 exchanges signals with the ECM, steering angle sensor, yaw rate and deceleration sensor, power steering ECU, main body ECU and combination meter via CAN communication.





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.

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:

Each connector is securely connected.

NG -- CONNECT CONNECTOR TO EACH SENSOR
OR ECM CORRECTLY
OK -- Continue to next step.

3. RECONFIRM DTC

(a) Clear the DTC(s) Vehicle Stability Control System (for Hydraulic Brake Booster).

(b) Record the output DTCs (for ABS, VSC, and CAN communication) ( Vehicle Stability Control System (for Hydraulic Brake Booster).

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 -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting

B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC Vehicle Stability Control System (for Hydraulic Brake Booster)

A -- CHECK CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting

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 How To Proceed With Troubleshooting.

(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 Hydraulic Brake Booster).

(c) Start the engine.

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

(e) Check that no CAN communication system DTC is output Vehicle Stability Control System (for Hydraulic Brake Booster).

(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 Hydraulic Brake Booster)

A -- CHECK CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting