U0126

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: U0073,U0100,U0123,U0124,U0126: Control Module Communication Bus OFF

DTC U0073 - Control Module Communication Bus OFF

DTC U0100 - Lost Communication with ECM / PCM

DTC U0123 - Lost Communication with Yaw Rate Sensor Module

DTC U0124 - Lost Communication with Lateral Acceleration Sensor Module

DTC U0126 - Lost Communication with Steering Angle Sensor Module

DESCRIPTION

The skid control ECU receives 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 Techstream, check for any momentary interruption in the wire harness and connector corresponding to the 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:
Each connector is 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 system and/or CAN communication system) Reading and Clearing Diagnostic Trouble Codes for ABS and VSC system, or Diagnosis System for CAN communication system).
HINT: If CAN communication system DTCs and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS and/or VSC system) after the CAN communication system returns to normal.

Result:






C -- INSPECT CAN COMMUNICATION SYSTEM
B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)
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 are no momentary interruptions.
NEXT -- Continue to next step.
5. RECONFIRM DTC
(a) Turn the ignition switch off.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(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 Diagnosis System.
(f) If ABS and/or VSC system DTCs are output, record them.
Result:





HINT: The CAN communication system must be normal when performing troubleshooting for each sensor DTC (for ABS and/or VSC system).

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