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Home >> Toyota >> 2021 >> 4Runner TRD Off-Road >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Touch Select 2-4 And High-Low System (VF2CM) - Diagnostic Codes & Circuit Tests) >> Touch Select 2-4 And High-Low System >> DTC P163B: 4WD ECU Malfunction [08/2019 - ] >> Procedure

DTC P163B: 4WD ECU Malfunction [08/2019 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU AND TRANSFER SHIFT ACTUATOR ASSEMBLY - BODY GROUND) 
    1. Disconnect the F46 4 wheel drive control ECU connector.
    2. Disconnect the B62 transfer shift actuator assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F46-8 (TM1) or B62-2 (TM1) - Body ground Always 10 kΩ or higher
      F46-7 (TM2) or B62-1 (TM2) - 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. INSPECT TRANSFER SHIFT ACTUATOR ASSEMBLY (TRANSFER SHIFT MOTOR) 
    1. Disconnect the B62 transfer shift actuator assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY859623Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transfer Shift Actuator Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (TM1) - 1 (TM2) Always 1.5 to 10 Ω
      2 (TM1) or 1 (TM2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY. Refer to  DISASSEMBLY [08/2019 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU AND A.D.D. ACTUATOR (DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY) - BODY GROUND) 
    1. Disconnect the F46 4 wheel drive control ECU connector.
    2. Disconnect the D1 A.D.D. actuator (differential vacuum actuator assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F46-2 (DM1) or D1-1 (DM1) - Body ground Always 10 kΩ or higher
      F46-6 (DM2) or D1-2 (DM2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. INSPECT A.D.D. ACTUATOR (DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY) 
    1. Disconnect the D1 A.D.D. actuator (differential vacuum actuator assembly) connector.
      GTY910801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (A.D.D. Actuator (Differential Vacuum Actuator Assembly))
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (DM1) - 2 (DM2) Always 1.5 to 10 Ω
      1 (DM1) or 2 (DM2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

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

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