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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 910 (Transfer Case) >> DTC/Circuit Diagnosis >> DTC P1813: 4WD Shift Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

  1. CHECK 4WD SHIFT SWITCH SIGNAL 

    With CONSULT 

    1. Turn ignition switch ON. (Do not start engine.)
    2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT.
    3. Read out ON/OFF switching action of the 2WD SWITCH, AUTO SWITCH, LOCK SWITCH, 4L SW with operating 4WD shift switch.

    Without CONSULT 

    1. Turn ignition switch ON. (Do not start engine.)
    2. Check voltage between transfer control unit harness connector terminals and ground.
      Connector Terminal Condition Voltage (Approx.)
      E142 9 - ground 4WD shift switch: 2WD Battery voltage
      4WD shift switch: AUTO, 4H or 4LO 0V
      18 - ground 4WD shift switch: 4H Battery voltage
      4WD shift switch: 2WD, AUTO or 4LO 0V
      23 - ground 4WD shift switch: 4LO Battery voltage
      4WD shift switch: 2WD, AUTO or 4H 0V
      24 - ground 4WD shift switch: AUTO Battery voltage
      4WD shift switch: 2WD, 4H or 4LO 0V
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminals E142 And Ground
      G04901477Courtesy of NISSAN NORTH AMERICA, INC.

      Are inspection results normal? 

      YES: GO TO  5.

      NO: GO TO 2.

  2. CHECK 4WD SHIFT SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
    2. Disconnect 4WD shift switch harness connector.
    3. Check voltage between 4WD shift switch harness connector terminal 1 and ground.
      Connector Terminal Voltage (Approx.)
      M141 1 - Ground 0V
      Fig 2: Checking Voltage Between 4WD Shift Switch Harness Connector Terminal 1 And Ground
      G04901478Courtesy of NISSAN NORTH AMERICA, INC.
    4. Turn ignition switch ON. (Do not start engine.)
    5. Check voltage between 4WD shift switch harness connector terminal 1 and ground.
      Connector Terminal Voltage (Approx.)
      M141 1 - Ground Battery voltage
      Fig 3: Checking Voltage Between 4WD Shift Switch Harness Connector Terminal 1 And Ground
      G04901479Courtesy of NISSAN NORTH AMERICA, INC.

      Are inspection results normal? 

      YES: GO TO 3.

      NO: Refer to "DIAGNOSIS PROCEDURE ".

  3. CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER CONTROL UNIT 
    1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and the 4WD shift switch harness connector.
    3. Check continuity between the following terminals.
      • Transfer control unit harness connector E142 terminal 9 and 4WD shift switch harness connector M141 terminal 2.
      • Transfer control unit harness connector E142 terminal 18 and 4WD shift switch harness connector M141 terminal 5.
      • Transfer control unit harness connector E142 terminal 23 and 4WD shift switch harness connector M141 terminal 6.
      • Transfer control unit harness connector E142 terminal 24 and 4WD shift switch harness connector M141 terminal 3.

        Continuity should exist. 

      Also check harness for short to ground and short to power.

      Fig 4: Checking Harness Between 4WD Shift Switch And Transfer Control Unit
      G04901480Courtesy of NISSAN NORTH AMERICA, INC.

      Are inspection results normal? 

      YES: GO TO 4.

      NO: Check the following. If any items are damaged, repair or replace damaged parts.

      • Harness for short or open between battery and transfer shut off relay harness connector E69 terminal 5.
      • Power supply circuit for transfer control unit. Refer to "DIAGNOSIS PROCEDURE ".
  4. CHECK 4WD SHIFT SWITCH 
    1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
    2. Disconnect 4WD shift switch harness connector.
    3. Operate 4WD shift switch and check continuity between 4WD shift switch terminals.
      Terminal Condition Continuity
      1 - 2 4WD shift switch: 2WD Yes
      4WD shift switch: AUTO, 4H and 4LO No
      1 - 3 4WD shift switch: AUTO Yes
      4WD shift switch: 2WD, 4H and 4LO No
      1 - 4 4WD shift switch: 2WD No
      4WD shift switch: AUTO, 4H and 4LO Yes
      1 - 5 4WD shift switch: 4H Yes
      4WD shift switch: 2WD, AUTO, and 4LO No
      1 - 6 4WD shift switch: 4LO Yes
      4WD shift switch: 2WD, AUTO and 4H No
      Fig 5: Checking Continuity Between 4WD Shift Switch Terminals
      G04901481Courtesy of NISSAN NORTH AMERICA, INC.

      Are inspection results normal? 

      YES: GO TO 5.

      NO: Replace 4WD shift switch.

  5. CHECK TRANSFER CONTROL UNIT 

    Check transfer control unit input/output signal. Refer to "REFERENCE VALUE ".

    Are inspection results normal? 

    YES: GO TO 6.

    NO: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

  6. CHECK DTC 

    Drive the vehicle and then perform self-diagnosis.

    Are inspection results normal? 

    YES: Inspection End.

    NO: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".

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