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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 P1819: Transfer Control Device >> 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 POWER SUPPLY
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector.
    3. Check voltage between transfer control unit harness connector terminal and ground.
      Connector Terminal Voltage (Approx.)
      M165 25 - Ground 0V
      M166 27 - Ground
      Fig 1: Checking Voltage Between Transfer Control Unit Connector Terminal And Ground
      G04898455Courtesy of NISSAN NORTH AMERICA, INC.
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer control unit harness connector terminals and ground.
      Connector Terminal Voltage (Approx.)
      M165 25 - Ground Battery voltage
      M166 27 - Ground
      Fig 2: Checking Voltage Between Transfer Control Unit Connector Terminals And Ground
      G04898456Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 2.

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

      • 10A fuse (No. 57, located in the fuse and relay box).
      • 40A fuse (No. J, located in the fuse and fusible link box).
      • Harness for short or open between battery and transfer shut off relay 1 harness connector E156 terminal 3.
      • Harness for short or open between transfer control unit harness connector M166 terminal 27 and transfer shut off relay 1 harness connector E156 terminal 5.
      • Harness for short or open between ignition switch and transfer shut off relay 1 harness connector E156 terminal 1.
      • Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 2 and ground.
      • Harness for short or open between ignition switch and transfer control unit harness connector M165 terminal 25.
      • Battery and ignition switch.
      • Transfer shut off relay 1. Refer to "COMPONENT INSPECTION ".
  2. CHECK GROUND CIRCUIT
    1. Turn ignition switch "OFF".
    2. Disconnect transfer control unit harness connector.
    3. Check continuity between transfer control unit harness connector M166 terminal 32 and ground.

      Continuity should exist  .

      Fig 3: Checking Continuity Between Transfer Control Unit Connector M166 Terminal 32 And Ground
      G04898457Courtesy of NISSAN NORTH AMERICA, INC.

      Also check harness for short to power.

      Is there continuity? 

      YES: GO TO 3.

      NO: Repair open circuit or short to power in harness or connectors.

  3. CHECK POWER SUPPLY SIGNAL
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Connect transfer control unit harness connector.
    3. Check voltage between transfer control unit harness connector terminal and ground.
      Connector Terminal Voltage (Approx.)
      M166 40 - Ground Battery voltage
      Fig 4: Checking Voltage Between Transfer Control Unit Connector Terminal And Ground
      G04898458Courtesy of NISSAN NORTH AMERICA, INC.
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer control unit harness connector terminal and ground.
      Connector Terminal Voltage (Approx.)
      M166 40 - Ground 0V
      Fig 5: Checking Voltage Between Transfer Control Unit Connector Terminal And Ground
      G04898459Courtesy of NISSAN NORTH AMERICA, INC.

      Are the 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 2 harness connector E157 terminal 1.
      • Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2 and transfer control unit harness connector M166 terminal 40.
      • Transfer shut off relay 2.
  4. CHECK TRANSFER CONTROL UNIT

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

    Are the inspection results normal? 

    YES: GO TO 5 (With CONSULT) or GO TO  6 (Without CONSULT).

    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.

  5. PERFORM SELF-DIAGNOSIS (WITH CONSULT)

    With CONSULT 

    1. Turn ignition switch "ON". (Do not start engine.)
    2. Select "SELF-DIAG RESULTS" mode for "ALL MODE AWD/4WD" with CONSULT.
    3. Touch "ERASE".
    4. Turn ignition switch "OFF" and wait at least 10 seconds.
    5. Perform the self-diagnosis again.

      Is the "SHIFT ACT CIR [P1819]" displayed? 

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

      NO: Inspection End.

  6. PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT)

    Without CONSULT 

    1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to "CONSULT FUNCTION (ALL MODE AWD/4WD) ".
    2. Perform the self-diagnosis again.

      Do the self-diagnostic results indicate transfer control device? 

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

      NO: Inspection End.

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