ELECTRONICALLY CONTROLLED BRAKE SYSTEM > ABS Warning Light Remains ON

for Preparation Click here


DESCRIPTION

The skid control ECU is connected to the combination meter via CAN and multiplex communications.
If any of the following is detected, the ABS warning light remains on.
  1. The skid control ECU connectors are disconnected from the skid control ECU.
  2. There is a malfunction in the skid control ECU internal circuit.
  3. There is an open in the harness between the combination meter and the skid control ECU.

HINT:
There is a case that the intelligent tester cannot be used when the skid control ECU is abnormal.


WIRING DIAGRAM


C112007E03


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (Click here).

1.INSPECT CAN COMMUNICATION SYSTEM

  1. Check if the CAN communication system DTC is output (Click here for LHD, Click here for RHD).

    Result:

    Condition
    		Proceed To
    DTC is not output
    		A
    DTC is output
    		B



B
REPAIR CAN COMMUNICATION SYSTEM
A


2.INSPECT MULTIPLEX COMMUNICATION SYSTEM

  1. Check if the multiplex communication system DTC is output (Click here).

    Result:

    Condition
    		Proceed To
    DTC is not output
    		A
    DTC is output
    		B



B
REPAIR MULTIPLEX COMMUNICATION SYSTEM
A


3.INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

  1. Check the skid control ECU connector's connecting condition.

    OK:
    The connector should be securely connected.



NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


4.INSPECT BATTERY

  1. Check the battery voltage.

    Voltage:
    10 to 14 V



NG
INSPECT CHARGING SYSTEM
OK


5.INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    F047485E33

  1. Turn the ignition switch on.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    S40-7 (IG1) - Body ground
    		Ignition switch on
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK


6.INSPECT SKID CONTROL ECU (GND TERMINAL)


    F047485E34

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		Specified Condition
    S41-1 (GND1) - Body ground
    		Below 1 Ω
    S40-2 (GND2) - Body ground
    		Below 1 Ω
    S40-1 (GND3) - Body ground
    		Below 1 Ω
    S39-2 (GND4) - Body ground
    		Below 1 Ω
    S39-1 (GND5) - Body ground
    		Below 1 Ω
    S38-4 (GND6) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK


7.INSPECT COMBINATION METER ASSEMBLY

  1. Check the combination meter assembly (Click here).

    HINT:
    If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE, refer back to the table and proceed to the next step before replacing the part (Click here).



NG
REPLACE COMBINATION METER ASSEMBLY
OK

REPLACE SKID CONTROL ECU