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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) >> VSC OFF Indicator Light Remains ON [08/2019 - ] >> Procedure

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

  1. CHECK CAN COMMUNICATION LINE 

    See step  2

    Result: 

    NG 

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU CSW CIRCUIT) 

    See step  3

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. CHECK TERMINAL VOLTAGE (EXI3) 

    See step  4

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  4

  4. READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE) 

    See step  5

    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 - ] 

  5. INSPECT VSC OFF SWITCH 

    See step  6

    Result: 

    NG 

    REPLACE VSC OFF SWITCH. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH) 

    See step  7

    Result: 

    OK 

    REPLACE MASTER CYLINDER SOLENOID. Refer to  DISASSEMBLY [08/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK TERMINAL VOLTAGE (EXI3) 

    See step  4

    Result: 

    B 

    See step  9

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  8

  8. CHECK TERMINAL VOLTAGE (EXI3) 

    See step  4

    Result: 

    OK 

    REPLACE MASTER CYLINDER SOLENOID. Refer to  DISASSEMBLY [08/2015 - ] 

    Result: 

    NG 

    REPLACE NO. 2 4 WHEEL DRIVE CONTROL ECU. Refer to  REMOVAL [08/2015 - ] 

  9. INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (REAR DIFFERENTIAL LOCK POSITION SWITCH) 

    See step  10

    Result: 

    NG 

    REPLACE REAR DIFFERENTIAL LOCK DETECTION SWITCH (REAR DIFFERENTIAL LOCK POSITION SWITCH). Refer to  REMOVAL [08/2015 - ] 

    Result: 

    OK 

    See step  10

  10. CHECK TERMINAL VOLTAGE (EXI3) 

    See step  4

    Result: 

    OK 

    REPLACE MASTER CYLINDER SOLENOID. Refer to  DISASSEMBLY [08/2015 - ] 

    Result: 

    NG 

    REPLACE NO. 2 4 WHEEL DRIVE CONTROL ECU. Refer to  REMOVAL [08/2015 - ]