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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 P180C: Sensor Power Supply (5V) >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK TRANSFER LOCK POSITION SENSOR POWER SUPPLY (1)
    1. Turn the ignition switch OFF.
    2. Disconnect transfer lock position sensor harness connector and transfer rotary position sensor harness connector.
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between transfer lock position sensor harness connector terminals.
      VOLTAGE SPECIFICATION

      + - Voltage
      Transfer lock position sensor
      Connector Terminal
      F40 1 2 Approx. 5 V

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. CHECK TRANSFER LOCK POSITION SENSOR CIRCUIT
    1. Turn the ignition switch OFF.
    2. Disconnect transfer control unit harness connector.
    3. Check the continuity between transfer control unit harness connector and transfer lock position sensor harness connector.
      CONTINUITY SPECIFICATION

      Transfer control unit Transfer lock position sensor Continuity
      Connector Terminal Connector Terminal
      E59 17 F40 1 Existed
      30 2
    4. Check the continuity between transfer lock position sensor harness connector and ground.
      CONTINUITY SPECIFICATION

      Transfer lock position sensor - Continuity
      Connector Terminal
      F40 1 Ground Not existed

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: Repair or replace error-detected parts.

  3. CHECK TRANSFER LOCK POSITION SENSOR POWER SUPPLY (2)
    1. Turn the ignition switch OFF.
    2. Connect transfer lock position sensor harness connector.
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between transfer lock position sensor harness connector terminals.
      VOLTAGE SPECIFICATION

      + - Voltage
      Transfer lock position sensor
      Connector Terminal
      F40 1 2 Approx. 5 V

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: Replace transfer lock position sensor. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK TRANSFER ROTARY POSITION SENSOR POWER SUPPLY (1)
    1. Turn the ignition switch OFF.
    2. Connect transfer control unit harness connector.
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between transfer rotary position sensor harness connector terminals.
      VOLTAGE SPECIFICATION

      + - Voltage
      Transfer rotary position sensor
      Connector Terminal
      F41 1 2 Approx. 5 V

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. CHECK TRANSFER ROTARY POSITION SENSOR CIRCUIT
    1. Turn the ignition switch OFF.
    2. Disconnect transfer control unit harness connector.
    3. Check the continuity between transfer control unit harness connector and transfer rotary position sensor harness connector.
      CONTINUITY SPECIFICATION

      Transfer control unit Transfer rotary position sensor Continuity
      Connector Terminal Connector Terminal
      E59 18 F41 1 Existed
      16 2
    4. Check the continuity between transfer rotary position sensor harness connector and ground.
      CONTINUITY SPECIFICATION

      Transfer rotary position sensor - Continuity
      Connector Terminal
      F41 1 Ground Not existed

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: Repair or replace error-detected parts.

  6. CHECK TRANSFER ROTARY POSITION SENSOR POWER SUPPLY (2)
    1. Turn the ignition switch OFF.
    2. Connect transfer lock position sensor harness connector.
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between transfer rotary position sensor harness connector terminals.
      VOLTAGE SPECIFICATION

      + - Voltage
      Transfer rotary position sensor
      Connector Terminal
      F41 1 2 Approx. 5 V

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Replace transfer rotary position sensor. Refer to "REMOVAL AND INSTALLATION ".

  7. CHECK TERMINALS AND HARNESS CONNECTORS

    Check the pin terminals for damage or loose connection with each 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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