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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1875 (Transfer Case) >> Trouble Diagnosis For System >> 4WD Shift Switch >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK 4WD SHIFT SWITCH SIGNAL 

    With CONSULT-II

    1. Turn ignition switch "ON".
    2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
    3. Read out ON/OFF switching action of the "2WD SWITCH", "4H SWITCH", "4L SWITCH" with operating 4WD shift switch.
    Fig 1: CONSULT II DATA MONITOR Screen
    G04204201Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II

    1. Turn ignition switch "ON".
    2. Check voltage between transfer control unit harness connector terminals and ground.
    TRANSFER CONTROL UNIT CONNECTOR TERMINALS AND GROUND VOLTAGE

    Connector Terminal Condition Voltage (Approx.)
    M152 14 - Ground 4WD shift switch: 2WD Battery voltage
    4WD shift switch: 4H and 4LO OV
    15 - Ground 4WD shift switch: 4H Battery voltage
    4WD shift switch: 2WD and 4LO OV
    16 - Ground 4WD shift switch: 4LO Battery voltage
    4WD shift switch: 2WD and 4H OV
    Fig 2: Identifying Voltage Between Transfer Control Unit Connector Terminals And Ground
    G04204202Courtesy of NISSAN MOTOR CO., U.S.A.

    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.
      4WD SHIFT SWITCH CONNECTOR TERMINAL 1 AND GROUND VOLTAGE

      Connector Terminal Voltage (Approx.)
      M141 1 - Ground OV
      Fig 3: Identifying Voltage Between 4WD Shift Switch Connector Terminal 1 And Ground
      G04204203Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between 4WD shift switch harness connector terminal 1 and ground.
    4WD SHIFT SWITCH CONNECTOR TERMINAL 1 AND GROUND VOLTAGE

    Connector Terminal Voltage (Approx.)
    M141 1 - Ground Battery voltage
    Fig 4: Identifying Voltage Between 4WD Shift Switch Connector Terminal 1 And Ground
    G04204204Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG:

    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. 58 located in the fuse and relay box). If any items are damaged, repair or replace damaged parts.
    2. Perform trouble diagnosis for power supply circuit. Refer to "POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ".
  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 14 and 4WD shift switch harness connector M141 terminal 3.
    • Transfer control unit harness connector M152 terminal 15 and 4WD shift switch harness connector M141 terminal 5.
    • Transfer control unit harness connector M152 terminal 16 and 4WD shift switch harness connector M141 terminal 6.

    Continuity should exist  .

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

    OK or NG 

    OK: GO TO 4.

    NG: Repair or replace damaged parts.

    Fig 5: Identifying Continuity Between 4WD Shift Switch And Transfer Control Unit Connector Terminals
    G04204205Courtesy of NISSAN MOTOR CO., U.S.A.
  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.
    4WD SHIFT SWITCH CONTINUITY

    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 6: Identifying Continuity Between 4WD Shift Switch Terminals
    G04204206Courtesy of NISSAN MOTOR CO., U.S.A.

    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 "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

    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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