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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1063 (Transfer Case (ATX14B)) >> DTC/Circuit Diagnosis >> DTC P1811: Power Supply Circuit For Transfer Control Unit >> 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 terminals and ground.
      Connector Terminal Voltage (Approx.)
      M152 16 - Ground 0V
      22 - Ground
      M153 29 - Ground
      30 - Ground Battery voltage
      47 - Ground
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground (Ignition Switch OFF)
      G08165810Courtesy 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 29 - Ground
      30 - Ground 0V
      47 - Ground Battery voltage
      Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground (Ignition Switch ON)
      G08165811Courtesy 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.

      • 40A fusible link (No. j, located in the fuse and fusible link box).
      • 10A fuses [No. 18 located in fuse block (J/B)] and No. 59 (located in the fuse and relay box).
      • Harness for short or open between battery and transfer control unit harness connector M153 terminals 47.
      • Harness for short or open between ignition switch and transfer control unit harness connector M153 terminal 29.
      • Harness for short or open between battery and transfer shut off relay harness connector E155 terminal 1 and 3.
      • Harness for short or open between transfer shut off relay harness connector E155 terminal 2 and transfer control unit harness connector M153 terminal 30.
      • Harness for short or open between transfer shut off relay harness connector E155 terminal 5 and transfer control unit harness connector M152 terminals 16 and 22.
      • Battery and ignition switch.
      • 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, M153 terminal 45 and ground.

      Continuity should exist  .

      Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector M152 Terminals 3, 6, M153 Terminal 45 And Ground
      G08165812Courtesy 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 TRANSFER CONTROL UNIT

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

    OK or NG 

    OK: GO TO 4.

    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.

  4. 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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