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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2256 (Transfer Case (TX15B)) >> 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".
    2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT.
    3. Read out ON/OFF switching action of the "2WD SWITCH", "4H SWITCH", "4L SWITCH" with operating 4WD shift switch.

    Without CONSULT 

    1. Turn ignition switch "ON".
    2. Check voltage between transfer control unit harness connector terminals and ground.
      Connector Terminal Condition Voltage (Approx.)
      M165 14 - Ground 4WD shift switch: 2WD Battery voltage
      4WD shift switch: 4H and 4LO 0V
      15 - Ground 4WD shift switch: 4H Battery voltage
      4WD shift switch: 2WD and 4LO 0V
      16 - Ground 4WD shift switch: 4LO Battery voltage
      4WD shift switch: 2WD and 4H 0V

      Are the inspection results normal? 

      YES: GO TO  5.

      Fig 1: Checking Voltage Between Transfer Control Unit Connector Terminals And Ground
      G04898425Courtesy of NISSAN NORTH AMERICA, INC.

      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.)
      M138 1 - Ground 0V
      Fig 2: Checking Voltage Between 4WD Shift Switch Connector Terminal 1 And Ground
      G04898426Courtesy 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.)
      M138 1 - Ground Battery voltage
      Fig 3: Checking Voltage Between 4WD Shift Switch Connector Terminal 1 And Ground
      G04898427Courtesy of NISSAN NORTH AMERICA, INC.

      Is there voltage? 

      YES: GO TO 3.

      NO >>

      1. Check harness for short or open between 4WD shift switch harness connector terminal 1 and transfer shut off relay 2 harness connector E157 terminal 5 and 10A fuse (No. 61 located in the fuse block). If any items are damaged, repair or replace damaged parts.
      2. Perform trouble diagnosis for power supply circuit. 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 M165 terminal 14 and 4WD shift switch harness connector M138 terminal 3.
      • Transfer control unit harness connector M165 terminal 15 and 4WD shift switch harness connector M138 terminal 5.
      • Transfer control unit harness connector M165 terminal 16 and 4WD shift switch harness connector M138 terminal 6.

      Continuity should exist  .

      Fig 4: Checking Continuity Between 4WD Shift Switch And Transfer Control Unit Connector Terminals
      G04898428Courtesy of NISSAN NORTH AMERICA, INC.

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

      Is there continuity? 

      YES: GO TO 4.

      NO: Repair or replace damaged parts.

  4. CHECK 4WD SHIFT SWITCH
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Remove 4WD shift switch harness connector.
    3. Operate 4WD shift switch and check continuity between 4WD shift switch terminals.
      Terminal Condition Continuity
      1 - 3 4WD shift switch: 2WD Yes
      4WD shift switch: 4H and 4LO No
      1 - 5 4WD shift switch: 4H Yes
      4WD shift switch: 2WD and 4LO No
      1 - 6 4WD shift switch: 4LO Yes
      4WD shift switch: 2WD and 4H No
      Fig 5: Checking Continuity Between 4WD Shift Switch Terminals
      G04898429Courtesy of NISSAN NORTH AMERICA, INC.

      Are the 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 the 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.

    Is DTC P1813 displayed? 

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

    NO: Inspection End.

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