Anti-Lock Brake System Abs Warning Light Remains On


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

INSPECT SKID CONTROL ECU CONNECTOR

READ VALUE USING INTELLIGENT TESTER (ECU IG POWER VOLTAGE)

CHECK BRAKE ACTUATOR ASSEMBLY (EXI2 VOLTAGE OF SKID CONTROL ECU)

INSPECT TRANSFER INDICATOR SWITCH (REAR DIFFERENTIAL LOCK)

CHECK WIRE HARNESS (TRANSFER INDICATOR SWITCH - SKID CONTROL ECU AND BODY GROUND)

CHECK ABS WARNING LIGHT

CHECK WIRE HARNESS (SKID CONTROL ECU - COMBINATION METER AND BODY GROUND)

INSPECT SKID CONTROL ECU CONNECTOR

CHECK BRAKE ACTUATOR ASSEMBLY (EXI2 VOLTAGE OF SKID CONTROL ECU)

CHECK TRANSFER INDICATOR SWITCH (REAR DIFFERENTIAL LOCK)

CHECK WIRE HARNESS (TRANSFER INDICATOR SWITCH - SKID CONTROL ECU AND BODY GROUND)

CHECK ABS WARNING LIGHT

CHECK WIRE HARNESS (SKID CONTROL ECU - COMBINATION METER AND BODY GROUND)

CHECK WIRE HARNESS (SKID CONTROL ECU - BODY GROUND)

ANTI-LOCK BRAKE SYSTEM - ABS Warning Light Remains ON


DESCRIPTION

When checking for a 2 digit DTC, the ABS warning light may remain on.

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Turn the ignition switch ON.

  1. Check that the ABS warning light illuminates.

  1. Check if the same DTCs are recorded.

    Result
    Result
    		Proceed to
    DTC is not output (when using intelligent tester)
    		A
    DTC is not output (when not using intelligent tester)
    		B
    DTC is output
    		C


B
Go to step 9

C
REPAIR CIRCUIT INDICATED BY OUTPUT DTC
A


2.INSPECT SKID CONTROL ECU CONNECTOR

  1. Check that each ECU connector is properly installed.

    OK:
    Each ECU connector is properly installed.


NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


3.READ VALUE USING INTELLIGENT TESTER (ECU IG POWER VOLTAGE)

  1. Using the Data List, check for proper functioning of the ECU IG power voltage.

    Skid control ECU
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    ECU IG Power Voltage
    		ECU power supply voltage / too Low, Normal or too High
    		Normal
    		-
    Result
    Result
    		Proceed to
    Display is Normal (w/ Rear Differential Lock)
    		A
    Display is Normal (w/o Rear Differential Lock)
    		B
    Display is not Normal
    		C


B
Go to step 7

C
Go to step 15
A


4.CHECK BRAKE ACTUATOR ASSEMBLY (EXI2 VOLTAGE OF SKID CONTROL ECU)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Measure the voltage of the ECU.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    S2-22 (EXI2) - Body ground
    		Ignition switch ON
    Rear differential lock switch OFF
    		8 to 14 V
    S2-22 (EXI2) - Body ground
    		Ignition switch ON
    Rear differential lock switch ON
    		Below 1.5 V


NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


5.INSPECT TRANSFER INDICATOR SWITCH (REAR DIFFERENTIAL LOCK)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Pushed
    		Below 1 Ω
    1 - 2
    		Not pushed
    		10 kΩ or higher


NG
REPLACE TRANSFER INDICATOR SWITCH (REAR DIFFERENTIAL LOCK)
OK


6.CHECK WIRE HARNESS (TRANSFER INDICATOR SWITCH - SKID CONTROL ECU AND BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Disconnect the S2 ECU connector.

  1. Disconnect the T29 switch connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    T29-2 -S2-22 (EXI2)
    		Below 1 Ω
    T29-2 - Body ground
    		10 kΩ or higher
    T29-1 - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


7.CHECK ABS WARNING LIGHT
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Disconnect the S2 ECU connector.

  1. Turn the ignition switch ON.

  1. Using a service wire, connect terminal WA to GND1 or GND2 of the S2 ECU connector. Check the ABS warning light.

    OK:
    ABS warning light turns off.

  1. Turn the ignition switch OFF.

  1. Remove the service wire.

  1. Turn the ignition switch ON. Check the ABS warning light.

    OK:
    ABS warning light illuminates.


NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


8.CHECK WIRE HARNESS (SKID CONTROL ECU - COMBINATION METER AND BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Disconnect the S2 ECU connector.

  1. Disconnect the C27 meter connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    S2-13 (WA) - C27-38
    		Below 1 Ω
    S2-13 (WA) - Body ground
    		10 kΩ or higher
    S2-2 (GND1) - Body ground
    		Below 1 Ω
    S2-24 (GND2) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY

9.INSPECT SKID CONTROL ECU CONNECTOR

  1. Check that each ECU connector is properly installed.

    OK:
    Each ECU connector is properly installed.
    Result
    Result
    		Proceed to
    OK (w/ Rear Differential Lock)
    		A
    OK (w/o Rear Differential Lock)
    		B
    NG
    		C


B
Go to step 13

C
CONNECT CONNECTOR TO ECU CORRECTLY
A


10.CHECK BRAKE ACTUATOR ASSEMBLY (EXI2 VOLTAGE OF SKID CONTROL ECU)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Measure the voltage of the ECU.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    S2-22 (EXI2) - Body ground
    		Ignition switch ON
    Rear differential lock switch OFF
    		8 to 14 V
    S2-22 (EXI2) - Body ground
    		Ignition switch ON
    Rear differential lock switch ON
    		Below 1.5 V


NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


11.CHECK TRANSFER INDICATOR SWITCH (REAR DIFFERENTIAL LOCK)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Pushed
    		Below 1 Ω
    1 - 2
    		Not pushed
    		10 kΩ or higher


NG
REPLACE TRANSFER INDICATOR SWITCH (REAR DIFFERENTIAL LOCK)
OK


12.CHECK WIRE HARNESS (TRANSFER INDICATOR SWITCH - SKID CONTROL ECU AND BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Disconnect the S2 ECU connector.

  1. Disconnect the T29 switch connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    T29-2 - S2-22 (EXI2)
    		Below 1 Ω
    T29-2 - Body ground
    		10 kΩ or higher
    T29-1 - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


13.CHECK ABS WARNING LIGHT
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Disconnect the S2 ECU connector.

  1. Turn the ignition switch ON.

  1. Using a service wire, connect terminal WA to GND1 or GND2 of the S2 ECU connector. Check the ABS warning light.

    OK:
    ABS warning light turns off.

  1. Turn the ignition switch OFF.

  1. Remove the service wire.

  1. Turn the ignition switch ON. Check the ABS warning light.

    OK:
    ABS warning light illuminates.


NG
REPLACE BRAKE ACTUATOR ASSEMBLY
OK


14.CHECK WIRE HARNESS (SKID CONTROL ECU - COMBINATION METER AND BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Disconnect the S2 ECU connector.

  1. Disconnect the C27 meter connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    S2-13 (WA) - C27-38
    		Below 1 Ω
    S2-13 (WA) - Body ground
    		10 kΩ or higher
    S2-2 (GND1) - Body ground
    		Below 1 Ω
    S2-24 (GND2) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY

15.CHECK WIRE HARNESS (SKID CONTROL ECU - BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Anti-Lock Brake System.Anti-Lock Brake System Abs Warning Light Remains On

  1. Disconnect the S2 ECU connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    S2-25 (IG1) - Body ground
    		Ignition switch ON
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY