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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2239 (Transfer Case (ATX14B)) >> DTC/Circuit Diagnosis >> DTC P1813: 4WD Shift Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. 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" and "4L SWITCH" while 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.)
      M152 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 And Ground
      G08165819Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  5.

      NG: 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
      G08165820Courtesy 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
      G08165821Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 3.

      NG: Check the following. If any items are damaged, repair or replace damaged parts.

      • Harness for short or open between transfer shut off relay harness connector E155 terminal 5.
      • Power supply circuit for transfer control unit. 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 M152 terminal 9 and 4WD shift switch harness connector M141 terminal 2.
      • Transfer control unit harness connector M152 terminal 18 and 4WD shift switch harness connector M141 terminal 5.
      • Transfer control unit harness connector M152 terminal 23 and 4WD shift switch harness connector M141 terminal 6.
      • Transfer control unit harness connector M152 terminal 24 and 4WD shift switch harness connector M141 terminal 3.

        Continuity should exist  .

        Fig 4: Checking Continuity Between Transfer Control Unit Connector Terminals And 4WD Shift Switch Connector Terminals
        G08165822Courtesy of NISSAN NORTH AMERICA, INC.

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

      OK or NG 

      OK: GO TO 4.

      NG: Repair or replace damaged parts.

  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.
      Connector Terminal Condition Continuity
      M141 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
      G08165823Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 5.

      NG: Replace 4WD shift switch.

  5. CHECK TRANSFER CONTROL UNIT

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

    OK or NG 

    OK: GO TO 6.

    NG: 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

    Perform the self-diagnosis, after driving a vehicle for a while.

    OK or NG 

    OK: Inspection End.

    NG: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".

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