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HOMESERVICE MANUALSTOYOTA20254RUNNER SR5, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONTRANSFER CASETOUCH SELECT 2-4 AND HIGH-LOW SYSTEM (VF2DM) - DIAGNOSTIC CODES & CIRCUIT TESTSTOUCH SELECT 2-4 AND HIGH-LOW SYSTEMDTC P17A8-13: 4WD/AWD TRANSFER CASE SHIFT MOTOR CONTROL CIRCUIT OPEN [12/2024 - ]PROCEDURE
2025 Toyota 4Runner SR5, 4WD

DTC P17A8-13: 4WD/AWD Transfer Case Shift Motor Control Circuit Open [12/2024 - ]: Procedure

2025 Toyota 4Runner SR5, 4WDSECTION Procedure
  1. CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - TRANSFER SHIFT ACTUATOR ASSEMBLY) 

    Pre-procedure1

    1. Disconnect the A28 4 wheel drive control ECU connector.
    2. Disconnect the F37 transfer shift actuator assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A28-1 (TM1) - F37-2 (TM1) Always Below 1 Ω
      A28-2 (TM2) - F37-1 (TM2) Always Below 1 Ω
      A28-1 (TM1) or F37-2 (TM1) - Body ground Always 10 kΩ or higher
      A28-2 (TM2) or F37-1 (TM2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Connect the F37 transfer shift actuator assembly connector.
    5. Connect the A28 4 wheel drive control ECU connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. INSPECT TRANSFER SHIFT ACTUATOR ASSEMBLY 

    Refer to PROCEDURE - Step 7

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE 4 WHEEL DRIVE CONTROL ECU 

    Refer to REMOVAL [12/2024 - ]

    Result: 

    NG 

    REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY 

    Refer to DISASSEMBLY [12/2024 - ]

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.