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Home >> Toyota >> 2021 >> 4Runner TRD Pro >> 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) >> TRAC OFF Indicator Light Remains ON [08/2015 - 08/2019] >> Procedure

TRAC OFF Indicator Light Remains ON [08/2015 - 08/2019]: Procedure

  1. CHECK DTC (ENGINE CONTROL SYSTEM) 
    1. Check if any DTC is recorded for the engine control system (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
      RESULT

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

    Result: 

    B 

    GO TO ENGINE CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) 

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

    Result: 

    A 

    See step  2

  2. 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  3

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU CSW CIRCUIT) 
    1. Disconnect the A6 skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      A6-9 (CSW) - Body ground VSC OFF switch not pushed in 10 kΩ or higher
      VSC OFF switch pushed in Below 1 Ω

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. 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.
      GTY688846Courtesy 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  8

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  5

  5. READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE) 
    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
      TRAC/VSC Off Mode TRAC/VSC off mode/ Normal, TRC OFF or VSC OFF Normal: Normal mode
      TRC OFF: TRAC OFF mode
      VSC OFF: VSC OFF mode      		 -
    6. Check that the mode display changes according to VSC OFF switch operation.

      OK

      Display changes according to switch operation.

    Result: 

    OK 

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

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

    Result: 

    NG 

    REPLACE MASTER CYLINDER SOLENOID 

    (Refer to DISASSEMBLY [08/2015 - ] )

  6. INSPECT VSC OFF SWITCH 
    1. Remove the VSC OFF switch (Refer to REMOVAL [08/2015 - ] ).
    2. Measure the resistance according to the value(s) in the table below.
      GTY702798Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      6 (OFF) - 3 (VSC) Switch is not pushed 10 kΩ or higher
      Switch is pushed Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (VSC OFF Switch)

    Result: 

    NG 

    REPLACE VSC OFF SWITCH 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH) 
    1. Disconnect the A6 skid control ECU connector.
    2. Disconnect the U6 VSC OFF switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A6-9 (CSW) - U6-6 (OFF) Always Below 1 Ω
      A6-9 (CSW) - Body ground Always 10 kΩ or higher
      U6-3 (VSC) - Body ground Always Below 1 Ω

    Result: 

    OK 

    REPLACE MASTER CYLINDER SOLENOID 

    (Refer to DISASSEMBLY [08/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK TERMINAL VOLTAGE (EXI3) 
    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.
      GTY688846Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A6-40 (EXI3) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Skid Control ECU)
      RESULT

      Result Proceed to
      OK (w/o Rear Differential Lock) A
      OK (w/ Rear Differential Lock) B
      NG C

    Result: 

    B 

    See step  10

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  9

  9. 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.
      GTY688846Courtesy 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 - ] )

  10. 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  11

  11. 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.
      GTY721184Courtesy 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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