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Home >> Toyota >> 2021 >> 4Runner Limited, AWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Vehicle Stability Control System (For Hydraulic Brake Booster) - Diagnostic Codes (C1422-U0073) & Symptom Tests >> VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster) >> ABS Warning Light Remains ON [08/2015 - 08/2019] >> Procedure

ABS Warning Light Remains ON [08/2015 - 08/2019]: Procedure

  1. CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED 
    1. Check the skid control ECU connector connection.

      OK

      The connector is securely connected.

    Result: 

    NG 

    CONNECT CONNECTOR TO ECU CORRECTLY 

    Result: 

    OK 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
      RESULT

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

    Result: 

    B 

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 08/2019] )

    Result: 

    A 

    See step  3

  3. CHECK CAN COMMUNICATION LINE 
    1. Turn the ignition switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] ).

      OK

      CAN Bus Check indicates no malfunctions in CAN communication.

    Result: 

    NG 

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (IG1 VOLTAGE VALUE) 

    Refer to PROCEDURE - Step 1

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. CHECK TERMINAL VOLTAGE (EXI3) 
    1. Disconnect the A6 skid control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY710232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A6-40 (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)
      RESULT

      Result Proceed to
      OK A
      NG (for 4WD) B
      NG (for 2WD) C

    Result: 

    B 

    See step  9

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  6

  6. READ VALUE USING TECHSTREAM (ABS WARNING LIGHT) 
    1. Turn the ignition switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ABS Warning Light ABS warning light/ ON or OFF OFF -
    6. When performing the ABS Warning Light Active Test, check ABS Warning Light in the Data List (Refer to DATA LIST / ACTIVE TEST [08/2015 - 08/2019] ).
      ABS/VSC/TRAC

      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

    Result: 

    A 

    REPLACE MASTER CYLINDER SOLENOID 

    (Refer to DISASSEMBLY [08/2015 - ] )

    Result: 

    B 

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

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] )

  7. CHECK TERMINAL VOLTAGE (IG1) 

    Refer to PROCEDURE - Step 3

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

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

    Refer to PROCEDURE - Step 2

    Result: 

    OK 

    REPLACE MASTER CYLINDER SOLENOID 

    (Refer to DISASSEMBLY [08/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI3 CIRCUIT) 
    1. Disconnect the A6 skid control ECU connector.
    2. Disconnect the F47 four wheel drive control ECU connector.
    3. w/ Rear Differential Lock:

      Disconnect the D3 rear differential lock detection switch connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A6-40 (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

    Result: 

    B 

    See step  11

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  10

  10. CHECK TERMINAL VOLTAGE (EXI3) 
    1. Disconnect the A6 skid control ECU connector.
    2. Connect the F47 four wheel drive control ECU connector.
    3. Measure the voltage according to the value(s) in the table below.
      GTY710232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A6-40 (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: 

    OK 

    REPLACE MASTER CYLINDER SOLENOID 

    (Refer to DISASSEMBLY [08/2015 - ] )

    Result: 

    NG 

    REPLACE FOUR WHEEL DRIVE CONTROL ECU 

    (Refer to REMOVAL [08/2015 - ] )

  11. INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (REAR DIFFERENTIAL LOCK POSITION SWITCH) 
    1. Remove the rear differential lock detection switch (Refer to REMOVAL [08/2015 - ] ).
    2. Measure the resistance according to the value(s) in the table below.
      GTY702267Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      2 (+B) - 1 (GND) Pushed in Below 1 Ω
      Not pushed in 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Differential Lock Detection Switch (Differential Lock Position Switch))

    Result: 

    NG 

    REPLACE REAR DIFFERENTIAL LOCK DETECTION SWITCH (REAR DIFFERENTIAL LOCK POSITION SWITCH) 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    OK 

    See step  12

  12. INSPECT TERMINAL VOLTAGE (EXI3) 
    1. Disconnect the A6 skid control ECU connector.
    2. Connect the F47 four wheel drive control ECU connector.
    3. Measure the voltage according to the value(s) in the table below.
      GTY710232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A6-40 (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: 

    OK 

    REPLACE MASTER CYLINDER SOLENOID 

    (Refer to DISASSEMBLY [08/2015 - ] )

    Result: 

    NG 

    REPLACE FOUR WHEEL DRIVE CONTROL ECU 

    (Refer to REMOVAL [08/2015 - ] )

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