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Home >> Toyota >> 2016 >> 4Runner Limited, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Touch Select 2-4 And High-Low System (VF2CM) - Diagnostic Codes & Circuit Tests) >> Touch Select 2-4 And High-Low System >> DTC P17A4: Automatic Disconnecting Differential Motor Limit Switch Circuit [08/2019 - ] >> Procedure

DTC P17A4: Automatic Disconnecting Differential Motor Limit Switch Circuit [08/2019 - ]: Procedure

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  1. CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - A.D.D. ACTUATOR (DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY)) 
    1. Disconnect the F47 4 wheel drive control ECU connector.
    2. Disconnect the D1 A.D.D. actuator (differential vacuum actuator assembly) connector.
    3. Disconnect the A6 skid control ECU (master cylinder solenoid) connector.
    4. Disconnect the F51 ECM connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F47-8 (DL1) - D1-6 (DL1) Always Below 1 Ω
      F47-7 (DL2) - D1-5 (DL2) Always Below 1 Ω
      F47-2 (ADD) - D1-3 (ADD) Always Below 1 Ω
      D1-4 (GND) - Body ground Always Below 1 Ω
      F47-8 (DL1) or D1-6 (DL1) - Body ground Always 10 kΩ or higher
      F47-7 (DL2) or D1-5 (DL2) - Body ground Always 10 kΩ or higher
      F47-2 (ADD) or D1-3 (ADD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK 4 WHEEL DRIVE CONTROL ECU (ECU OUTPUT VOLTAGE) 
    1. Disconnect the D1 A.D.D. actuator (differential vacuum actuator assembly) connector.
      GTY854706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to A.D.D. Actuator (Differential Vacuum Actuator Assembly))
    2. Disconnect the A6 skid control ECU (master cylinder solenoid) connector.
    3. Disconnect the F51 ECM connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D1-6 (DL1) - Body ground Ignition switch ON 10 to 14 V
      D1-5 (DL2) - Body ground Ignition switch ON 10 to 14 V
      D1-3 (ADD) - Body ground Ignition switch ON 10 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE A.D.D. ACTUATOR (DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY). Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    REPLACE 4 WHEEL DRIVE CONTROL ECU. Refer to  REMOVAL [08/2019 - ] 

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