Anti-Lock Brake System Abs Warning Light Remains On

Brake. Land Cruiser. Urj200, 202 Grj200 Vdj200
Brake Control Dynamic Control Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK DTC

CHECK CAN COMMUNICATION LINE

READ VALUE USING GTS (IG1 VOLTAGE VALUE)

CHECK HARNESS AND CONNECTOR (P TERMINAL)

PERFORM ACTIVE TEST USING GTS (ABS WARNING LIGHT)

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

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

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU P CIRCUIT)

CHECK HARNESS AND CONNECTOR (P TERMINAL)

INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (NO. 1 TRANSFER INDICATOR SWITCH)

CHECK HARNESS AND CONNECTOR (P TERMINAL)

ANTI-LOCK BRAKE SYSTEM - ABS Warning Light Remains ON


DESCRIPTION

If any of the following is detected, the ABS warning light remains on.
  1. The skid control ECU (master cylinder solenoid) connector is disconnected from the skid control ECU (master cylinder solenoid).
  2. There is a malfunction in the skid control ECU (master cylinder solenoid) internal circuit.
  3. There is an open in the harness between the combination meter and skid control ECU (master cylinder solenoid).
  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 GTS when the skid control ECU (master cylinder solenoid) is abnormal.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On


INSPECTION PROCEDURE

NOTICE:
After replacing the master cylinder solenoid, perform calibration (Click here).
1.CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

  1. Check the skid control ECU (master cylinder solenoid) connector connection.

    OK:
    The 2 connectors are securely connected.


NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


2.CHECK DTC

  1. Check for DTCs (Click here).

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


B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (Click here)
A


3.CHECK CAN COMMUNICATION LINE

  1. Turn the ignition switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus.

    OK:
    CAN Bus Check indicates no malfunctions in CAN communication.

    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD (with Central Gateway ECU))
    		B
    NG (for LHD (without Central Gateway ECU))
    		C
    NG (for RHD (with Central Gateway ECU))
    		D
    NG (for RHD (without Central Gateway ECU))
    		E


B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)

D
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)

E
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)
A


4.READ VALUE USING GTS (IG1 VOLTAGE VALUE)

  1. Turn the ignition switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS 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 (master cylinder solenoid) displayed on the GTS.

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


NG
Go to step 7
OK


5.CHECK HARNESS AND CONNECTOR (P TERMINAL)

  1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Anti-Lock Brake System 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
    A24-14 (P) - 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 [Master Cylinder Solenoid])


NG
Go to step 9
OK


6.PERFORM ACTIVE TEST USING GTS (ABS WARNING LIGHT)

  1. Turn the ignition switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

    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.

  1. When performing the ABS Warning Light Active Test, check ABS Warning Light in the Data List (Click here).

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

    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 (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)

7.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

  1. Disconnect the skid control ECU (master cylinder solenoid) connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Anti-Lock Brake System 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
    A24-46 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU (Master Cylinder Solenoid))


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Turn the ignition switch off.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Disconnect the A24 and A25 skid control ECU (master cylinder solenoid) connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A24-1 (GND1) - Body ground
    		Always
    		Below 1 Ω
    A24-32 (GND2) - Body ground
    		Always
    		Below 1 Ω
    A25-4 (GND3) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Master Cylinder Solenoid])
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for LHD)
    		B
    OK (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

  1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

  1. Disconnect the A27 4 wheel drive control ECU connector.

  1. w/ Rear Differential Lock:
    Disconnect the f2 rear differential lock detection switch (No. 1 transfer indicator switch) connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    A24-14 (P) - 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 HARNESS AND CONNECTOR (P TERMINAL)

  1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

  1. Connect the A27 4 wheel drive control ECU connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Anti-Lock Brake System 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
    A24-14 (P) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Master Cylinder Solenoid])
    Result
    Result
    		Proceed to
    NG (for LHD)
    		A
    NG (for RHD)
    		B
    OK (for LHD)
    		C
    OK (for RHD)
    		D


B
REPLACE 4 WHEEL DRIVE CONTROL ECU (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)

D
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

REPLACE 4 WHEEL DRIVE CONTROL ECU (Click here)

11.INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (NO. 1 TRANSFER INDICATOR SWITCH)

  1. Remove the rear differential lock detection switch (No. 1 transfer indicator switch) (Click here).

  1. Inspect the rear differential lock detection switch (No. 1 transfer indicator switch) (Click here).



NG
REPLACE NO. 1 TRANSFER INDICATOR SWITCH (Click here)
OK


12.CHECK HARNESS AND CONNECTOR (P TERMINAL)

  1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

  1. Connect the A27 4 wheel drive control ECU connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Anti-Lock Brake System 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
    A24-14 (P) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Master Cylinder Solenoid])
    Result
    Result
    		Proceed to
    NG (for LHD)
    		A
    NG (for RHD)
    		B
    OK (for LHD)
    		C
    OK (for RHD)
    		D


B
REPLACE 4 WHEEL DRIVE CONTROL ECU (Click here)

C
REPLACE MASTER CYLINDER SOLENOID (Click here)

D
REPLACE MASTER CYLINDER SOLENOID (Click here)
A

REPLACE 4 WHEEL DRIVE CONTROL ECU (Click here)