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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 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. Connect transfer control unit harness connector.
    3. Check voltage between transfer control unit harness connector terminal and ground.
      Connector Terminal Voltage (Approx.)
      M152 16 - Ground 0V
      22 - Ground
      M153 30 - Ground Battery voltage
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground (Ignition Switch Off)
      G08165848Courtesy 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.)
      M152 16 - Ground Battery voltage
      22 - Ground
      M153 30 - Ground 0V
      Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground (Ignition Switch On)
      G08165849Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 2.

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

      • 10A fuse (No. 59, located in the fuse and relay box).
      • Harness for short or open between battery and transfer shut off relay harness connector E155 terminal 1.
      • Harness for short or open between transfer shut off relay harness connector E155 terminal 2 and transfer control unit harness connector terminal 30.
      • Harness for short or open between battery and transfer shut off relay harness connector E155 terminal 3.
      • Harness for short or open between transfer shut off relay harness connector E155 terminal 5 and transfer control unit harness connector 22.
      • Transfer shut off relay. Refer to "COMPONENT INSPECTION ".
  2. CHECK GROUND CIRCUIT
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector.
    3. Check continuity between transfer control unit harness connector M152 terminals 3, 6 and M153 terminal 45 and ground.

      Continuity should exist  .

      Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector M152 Terminals 3, 6 And M153 Terminal 45 And Ground
      G08165850Courtesy of NISSAN NORTH AMERICA, INC.

      Also check harness for short to power.

      OK or NG 

      OK: GO TO 3.

      NG: Repair open circuit or short to power in harness or connectors.

  3. CHECK ACTUATOR MOTOR POWER SUPPLY CIRCUIT
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Remove transfer shift high relay and transfer shift low relay. Refer to "COMPONENT PARTS LOCATION ".
    3. Check voltage between transfer shift high relay harness connector E46 terminal 5, transfer shift low relay harness connector E47 terminal 5 and ground.
      Connector Terminal Voltage (Approx.)
      E46 5 - Ground Battery voltage
      E47 5 - Ground
      Fig 4: Checking Actuator Motor Power Supply Circuit (Ignition Switch Off)
      G08165851Courtesy of NISSAN NORTH AMERICA, INC.
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer shift high relay harness connector E46 terminal 5, transfer shift low relay harness connector E47 terminal 5 and ground.
      Connector Terminal Voltage (Approx.)
      E46 5 - Ground Battery voltage
      E47 5 - Ground
      Fig 5: Checking Actuator Motor Power Supply Circuit (Ignition Switch On)
      G08165852Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 4.

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

      • 20A fuse [No. 58, located in the fuse and relay box].
      • Harness for short or open between battery, transfer shift high harness connector E46 terminal 5 and transfer shift low harness connector E47 terminal 5.
  4. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT RELAY
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and transfer control device (actuator motor) harness connector.
    3. Remove transfer shift high relay and transfer shift low relay.
    4. Check continuity between the following terminals.
      • Transfer control unit harness connector M153 terminal 33 and transfer shift high relay harness connector E46 terminal 3.
      • Transfer control unit harness connector M153 terminal 42 and transfer shift low relay harness connector E47 terminal 3.

        Continuity should exist  .

        Fig 6: Checking Continuity Between Transfer Control Unit Connector Terminal And Transfer Shift High And Low Relay Connector Terminal
        G08165853Courtesy of NISSAN NORTH AMERICA, INC.

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

      OK or NG 

      OK: GO TO 5.

      NG: Repair or replace damaged parts.

  5. CHECK TRANSFER SHIFT RELAY GROUND CIRCUIT
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Remove transfer shift high relay and transfer shift low relay.
    3. Check continuity between transfer shift high relay harness connector E46 (A) terminals 1 and 4 and transfer shift low relay harness connector E47 (B) terminals 1 and 4 and ground.

      Continuity should exist  .

      Fig 7: Checking Voltage Between Transfer Shift High And Low Relay Connector Terminals And Ground
      G08165854Courtesy of NISSAN NORTH AMERICA, INC.

      Also check harness for short to power.

      OK or NG 

      OK: GO TO 6.

      NG: Repair open circuit or short to power in harness or connectors.

  6. CHECK TRANSFER CONTROL UNIT

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

    OK or NG 

    OK-1 >> With CONSULT: GO TO 7.

    OK-2 >> Without CONSULT: GO TO  8.

    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.

  7. 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.

  8. 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.

      NO: Inspection End.

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