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


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK DTC

CHECK CAN COMMUNICATION LINE

READ VALUE USING INTELLIGENT TESTER (IG1 VOLTAGE VALUE)

CHECK TERMINAL VOLTAGE (EXI3)

READ VALUE USING INTELLIGENT TESTER (ABS WARNING LIGHT)

CHECK TERMINAL VOLTAGE (IG1)

CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI3 CIRCUIT)

CHECK TERMINAL VOLTAGE (EXI3)

INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (DIFFERENTIAL LOCK INDICATOR SWITCH)

CHECK TERMINAL VOLTAGE (EXI3)

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


DESCRIPTION

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 skid control ECU.
  4. The anti-lock brake system is defective.
  5. The voltage at terminal IG1 is high.
  6. The rear differential is locked.*
  1. *: w/ Rear Differential Lock
HINT:
It may not be possible to use the intelligent tester 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 Hydraulic Brake Booster) Abs Warning Light Remains On


INSPECTION PROCEDURE

NOTICE:
When replacing the master cylinder solenoid, perform calibration (LandCruiser RM00000452J00ZX.html).
1.CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

  1. Check the skid control ECU connector connection.

    OK:
    The 2 connectors are securely connected.


NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


2.CHECK DTC

  1. Check for DTCs (LandCruiser RM0000046KV016X.html).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (LandCruiser RM0000045Z601DX.html)
A


3.CHECK CAN COMMUNICATION LINE

  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. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (for LHD: LandCruiser RM000000WIB0ECX.html, for RHD: LandCruiser RM000000WIB0EEX.html).

    OK:
    CAN Bus Check indicates no malfunctions in CAN communication.
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


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

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (LandCruiser RM000001RSO0BZX.html)
A


4.READ VALUE USING INTELLIGENT TESTER (IG1 VOLTAGE VALUE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Start the engine.

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

    ABS/VSC/TRC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    IG1 Voltage Value
    		IG1 voltage value/ Min.: 0.00 V, Max.: 20.00 V
    		Ignition switch ON: 11 to 14 V
    		-

  1. Check the voltage output from the skid control ECU displayed on the intelligent tester.

    OK:
    The output voltage displayed on the intelligent tester is within 11 to 14 V.


NG
Go to step 7
OK


5.CHECK TERMINAL VOLTAGE (EXI3)

  1. Disconnect the A7 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 Hydraulic 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
    A7-40 (EXI3) - Body ground
    		Ignition switch ON
    w/ Rear Differential Lock: Rear differential free
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU)


NG
Go to step 9
OK


6.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 RM000001DWY02VX.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
    		Changes between ON and OFF
    		A
    Does not change between ON and OFF (for LHD)
    		B
    Does not change between ON and OFF (for RHD)
    		C
    OFF
    		Changes between ON and OFF
    		A
    Does not change between ON and OFF (for LHD)
    		B
    Does not change between ON and OFF (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

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

7.CHECK TERMINAL VOLTAGE (IG1)

  1. Disconnect the A7 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 Hydraulic 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
    A7-46 (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
OK


8.CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)

  1. Disconnect the A7 and A8 skid control ECU connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A7-1 (GND1) - Body ground
    		Always
    		Below 1 Ω
    A7-32 (GND2) - Body ground
    		Always
    		Below 1 Ω
    A8-4 (GND3) - Body ground
    		Always
    		Below 1 Ω
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for LHD)
    		B
    OK (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI3 CIRCUIT)

  1. Disconnect the A7 skid control ECU connector.

  1. Disconnect the G53 four wheel drive control ECU connector.

  1. w/ Rear Differential Lock:
    Disconnect the E2 rear differential lock detection switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A7-40 (EXI3) - Body ground
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    OK (w/o Rear Differential Lock)
    		A
    OK (w/ Rear Differential Lock)
    		B
    NG
    		C


B
Go to step 11

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A


10.CHECK TERMINAL VOLTAGE (EXI3)

  1. Disconnect the A7 skid control ECU connector.

  1. Connect the G53 four wheel drive 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 Hydraulic 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
    A7-40 (EXI3) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU)
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for LHD)
    		B
    OK (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

REPLACE 4 WHEEL DRIVE CONTROL ECU (LandCruiser RM00000479S00VX.html)

11.INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (DIFFERENTIAL LOCK INDICATOR SWITCH)

  1. Remove the rear differential lock detection switch (LandCruiser RM000003PYI00GX.html).



    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 Hydraulic Brake Booster) Abs Warning Light Remains On

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 (GND) - 2 (+B)
    		Pushed in
    		Below 1 Ω
    Not pushed in
    		10 kΩ or higher
    Text in Illustration
    *a
    		Component without harness connected
    (Rear Differential Lock Detection Switch)


NG
REPLACE REAR DIFFERENTIAL LOCK DETECTION SWITCH (DIFFERENTIAL LOCK INDICATOR SWITCH) (LandCruiser RM000003PYI00GX.html)
OK


12.CHECK TERMINAL VOLTAGE (EXI3)

  1. Disconnect the A7 skid control ECU connector.

  1. Connect the G53 four wheel drive 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 Hydraulic 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
    A7-40 (EXI3) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU)
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for LHD)
    		B
    OK (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

REPLACE 4 WHEEL DRIVE CONTROL ECU (LandCruiser RM00000479S00VX.html)