U0123
U0073, U0123, U0124, U0126, U0293Description
The brake ECU receives the signals from the HV ECU, steering angle sensor, and yaw rate/side/decel G sensor via the CAN communication system.
DTC Logic (Part 1):
DTC Logic (Part 2):
Diagnosis Procedure
1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
Using the "DATA MONITOR" of CONSULT-III, check for any momentary interruption in the wire harness and connector corresponding to a DTC.
Result:
A >> GO TO 2.
B >> GO TO 3.
C >> GO TO 4.
2.CHECK IF EACH SENSOR AND ECU CONNECTOR IS SECURELY CONNECTED
1. Turn the ignition switch OFF.
2. Check if each sensor and ECU connector is securely connected.
NOTE:
The connector should be securely connected.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Connect connector to each sensor or ECU correctly.
3.RECONFIRM DTC
1. Turn the ignition switch OFF.
2. Record the output DTCs (for ABS, VDC, Electronically Controlled Brake, and CAN communication).
NOTE:
If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS, VDC and Electronically Controlled Brake) after the CAN communication system returns to normal.
Result:
A >> Inspect CAN communication system.
B >> Repair circuit indicated by output DTC.
C >> Check for intermittent problems (symptom simulation).
4.REPAIR OR REPLACE HARNESS OR CONNECTOR
1. Turn the ignition switch OFF.
2. Repair or replace the harness or connector.
3. Check for any momentary interruption between the brake ECU and each sensor or ECU.
4. Check that there is no momentary interruption.
>> GO TO 5.
5.RECONFIRM DTC
1. Turn the ignition switch OFF.
2. Clear the DTC.
3. Turn the ignition switch ON (READY).
4. Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 MPH) or more.
5. Check that no CAN communication system DTC is output.
6. If ABS, VDC and Electronically Controlled Brake DTCs are output, record them.
Result:
NOTE:
The CAN communication system must be normal when repairing each sensor DTC (for ABS, VDC and Electronically Controlled Brake).
A >> Inspect CAN communication system.
B >> Repair circuit indicated by output DTC.
C >> INSPECTION END