ANTI-LOCK BRAKE SYSTEM (w/ Rear Differential Lock) ABS Warning Light Remains ON

DESCRIPTION

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

WIRING DIAGRAM

A01DWUDE01
A01DW0DE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Turn the ignition switch ON.

    2. Check that the ABS warning light illuminates.

    3. 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

    INSPECT SKID CONTROL ECU CONNECTOR Click here

    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
      Item Measurement Item / Range (Display) Normal Condition Diagnostic Note
      ECU IG Power Voltage ECU power supply voltage / TOO LOW / NORMAL / TOO HIGH

      TOO HIGH: more than 14.0 V

      NORMAL: 10 to 14 V

      TOO LOW: Below 10 V

      		 -
      Result
      Result Proceed to
      Display is NORMAL A
      Display is not NORMAL B

    B

    CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY) Click here

    A

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


    1. A01E2FWE01

      Measure the voltage of 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)


    1. A01E1XCE03

      Measure the resistance of the switch.

      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)

    A01DZM8E09

    1. Disconnect the S2 ECU connector.

    2. Disconnect the T31 switch connector.

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

      Standard resistance
      Tester Connection Specified Condition
      T31-2 -S2-22 (EXI2) Below 1 Ω
      T31-2 - Body ground 10 kΩ or higher
      T31-1 - Body ground Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  7. CHECK ABS WARNING LIGHT

    A01DV4SE08

    1. Disconnect the S2 ECU connector.

    2. Turn the ignition switch ON.

    3. 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.

    4. Turn the ignition switch OFF.

    5. Remove the service wire.

    6. 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 ASSEMBLY AND BODY GROUN)

    A01E0HWE29

    1. Disconnect the S2 ECU connector.

    2. Disconnect the C25 meter connector.

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

      Standard resistance
      Tester Connection Specified Condition
      S2-13 (WA) - C25-38 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.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

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


    1. A01E2FWE01

      Measure the voltage of 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)


    1. A01E1XCE03

      Measure the resistance of the switch.

      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)

    A01DZM8E09

    1. Disconnect the S2 ECU connector.

    2. Disconnect the T31 switch connector.

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

      Standard resistance
      Tester Connection Specified Condition
      T31-2 -S2-22 (EXI2) Below 1 Ω
      T31-2 - Body ground 10 kΩ or higher
      T31-1 - Body ground Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  13. CHECK ABS WARNING LIGHT

    A01DV4SE10

    1. Disconnect the S2 ECU connector.

    2. Turn the ignition switch ON.

    3. 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.

    4. Turn the ignition switch OFF.

    5. Remove the service wire.

    6. 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)

    A01E0HWE29

    1. Disconnect the S2 ECU connector.

    2. Disconnect the C25 meter connector.

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

      Standard resistance
      Tester Connection Specified Condition
      S2-13 (WA) - C25-38 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 - BATTERY)

    A01DV4SE09

    1. Disconnect the S2 ECU connector.

    2. 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