Anti-Lock Brake System for Hatchback (from 07/2011)

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ANTI-LOCK BRAKE SYSTEM (for Hatchback): U0073, U0142: Control Module Communication Bus OFF
U0142 - Lost Communication with Main Body ECU

DESCRIPTION

The skid control ECU (brake actuator assembly) receives the signals from the ECM, steering angle sensor (spiral cable sub-assembly), and yaw rate sensor (airbag sensor assembly) via the CAN communication system.





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 Anti-Lock Brake System for Hatchback (from 07/2011).

ABS/VSC/TRAC





Result





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

B -- RECONFIRM DTC

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
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, and CAN communication) Anti-Lock Brake System (for Hatchback).

HINT
If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS) after the CAN communication system returns to normal.

Result





B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC Anti-Lock Brake System (for Hatchback)

C -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Anti-Lock Brake System for Hatchback (from 07/2011)

A -- CHECK CAN COMMUNICATION SYSTEM How To Proceed With Troubleshooting (from 07/2011)

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 (brake actuator assembly) and each sensor or ECM Anti-Lock Brake System for Hatchback (from 07/2011).

(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 Anti-Lock Brake System (for Hatchback).

(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 (from 07/2011).

(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).

B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC Anti-Lock Brake System (for Hatchback)

C -- CHECK CAN COMMUNICATION SYSTEM How To Proceed With Troubleshooting (from 07/2011)

A -- END