Vehicle Stability Control System (For Vacuum Brake Booster) Abs Warning Light Remains On


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK TERMINAL VOLTAGE (IG1)

CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

READ VALUE USING INTELLIGENT TESTER (ABS WARNING LIGHT)

VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster) - ABS Warning Light Remains ON


DESCRIPTION

The skid control ECU is connected to the combination meter via CAN communication.
If any of the following is detected, the ABS warning light remains on:
  1. The skid control ECU connector is 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.
  4. The anti-lock brake system is defective.
  5. The voltage at terminal IG1 is high.
HINT:
In some cases, the intelligent tester cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Vehicle Stability Control System (For Vacuum Brake Booster) Abs Warning Light Remains On


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform calibration (LandCruiser RM000000XHR0BKX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if CAN communication system DTCs are output (for LHD without Entry and Start System: LandCruiser RM000000WIB0EDX.html, for LHD with Entry and Start System: LandCruiser RM000000WIB0ECX.html).

    Result
    Result
    		Proceed to
    DTC not output
    		A
    DTC output
    		for LHD without Entry and Start System
    		B
    DTC output
    		for LHD with Entry and Start System
    		C


B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0BYX.html)

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0C5X.html)
A


2.CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

  1. Check if the skid control ECU connector is securely connected.

    OK:
    The connector is securely connected.


NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


3.CHECK TERMINAL VOLTAGE (IG1)

  1. Disconnect the A6 skid control ECU connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Vehicle Stability Control System (For Vacuum Brake Booster) Abs Warning Light Remains On

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A6-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU)


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


4.CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

  1. Disconnect the A6 skid control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A6-1 (GND1) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)
OK


5.READ VALUE USING INTELLIGENT TESTER (ABS WARNING LIGHT)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.


ABS/VSC/TRC
Tester Display
Measurement Item/Range
Normal Condition
Diagnostic Note
ABS Warning Light
ABS warning light / ON or OFF
OFF
-

  1. When performing the ABS Warning Light Active Test, check ABS Warning Light in the Data List (LandCruiser RM000000XHW0GKX.html).


ABS/VSC/TRC
Tester Display
Test Part
Control Range
Diagnostic Note
ABS Warning Light
ABS warning light
Warning light ON/OFF
Observe the combination meter.

Result
Result
Proceed to
Data List Display
Data List Display when Performing Active Test ON/OFF Operation
ON
Does not change between ON and OFF
A
Changes between ON and OFF
B
OFF
Does not change between ON and OFF
A
Changes between ON and OFF
B


B
GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000002Z4L055X.html)
A

REPLACE BRAKE ACTUATOR ASSEMBLY (LandCruiser RM0000034UX02TX.html)