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Home >> Infiniti >> 2011 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Transfer Case (ATX90A)) >> DTC/Circuit Diagnosis >> DTC P1811: Power Supply Circuit For Transfer Control Unit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY (1)
    1. Turn the ignition switch OFF.
    2. Disconnect transfer control unit harness connector.
    3. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E59 20 Ground Battery voltage
    4. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    5. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E59 20 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#34).
    3. Check the harness for open or short between transfer control unit harness connector No. 0 terminal and 10A (#34).

      Is the inspection result normal? 

      YES: Perform the trouble diagnosis for power supply circuit. Refer to "WIRING DIAGRAM - BATTERY POWER SUPPLY - ".

      NO: Repair or replace error-detected parts.

  3. CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)
    1. Turn the ignition switch OFF.
    2. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E59 32 Ground 0 V
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E59 32 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#56).
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
      CONTINUITY SPECIFICATION

      IPDM E/R Transfer control unit Continuity
      Connector Terminal Connector Terminal
      E15 58 E59 32 Existed
    5. Check the continuity between transfer control unit harness connector and the ground.
      CONTINUITY SPECIFICATION

      Transfer control unit - Continuity
      Connector Terminal
      E59 32 Ground Not existed

      Is the inspection result normal? 

      YES: Perform the trouble diagnosis for ignition power supply circuit. Refer to "WIRING DIAGRAM - IGNITION POWER SUPPLY - ".

      NO: Repair or replace error-detected parts.

  5. CHECK TRANSFER CONTROL UNIT GROUND
    1. Turn the ignition switch OFF.
    2. Check the continuity between transfer control unit harness connector and ground.
      CONTINUITY SPECIFICATION

      Transfer control unit - Continuity
      Connector Terminal
      E60 46 Ground Existed
      44

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Repair or replace error-detected parts.

  6. CHECK TERMINALS AND HARNESS CONNECTORS

    Check the transfer control unit pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal? 

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

    NO: Repair or replace error-detected parts.

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