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Home >> Infiniti >> 2011 >> G37 IPL, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 66 (Transfer Case -- G37 Coupe) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

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

      AWD control unit - Voltage (Approx.)
      Connector Terminal
      F108 7 Ground 0 V
    4. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    5. Check the voltage between AWD control unit harness connector and ground.
    TERMINALS VOLTAGE REFERENCE CHART

    AWD control unit - Voltage
    Connector Terminal
    F108 7 Ground Battery voltage

    Is the inspection result normal? 

    YES: Go to  3.

    NO: Go to 2.

  2. CHECK AWD CONTROL UNIT POWER SUPPLY (2)
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#45).
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between AWD control unit harness connector and IPDM E/R harness connector.
      TERMINALS CONTINUITY REFERENCE CHART

      AWD control unit IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F108 7 E5 25 Existed
    5. Check the continuity between AWD control unit harness connector and the ground.
    TERMINALS CONTINUITY REFERENCE CHART

    AWD control unit - Continuity
    Connector Terminal
    F108 7 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.

  3. CHECK AWD CONTROL UNIT POWER SUPPLY (3)
    1. Turn the ignition switch OFF.
    2. Check the voltage between AWD control unit harness connector and ground.
      TERMINALS VOLTAGE REFERENCE CHART

      AWD control unit - Voltage (Approx.)
      Connector Terminal
      F108 15 Ground Battery voltage
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between AWD control unit harness connector and ground.
    TERMINALS VOLTAGE REFERENCE CHART

    AWD control unit - Voltage
    Connector Terminal
    F108 15 Ground Battery voltage

    Is the inspection result normal? 

    YES: Go to  5.

    NO: Go to 4.

  4. CHECK AWD CONTROL UNIT POWER SUPPLY (4)
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#11).
    3. Disconnect fuse block (J/B) harness connector.
    4. Check the continuity between AWD control unit harness connector and fuse block (J/B).
      TERMINALS CONTINUITY REFERENCE CHART

      AWD control unit Fuse block (J/B) Continuity
      Connector Terminal Connector Terminal
      F108 15 M1 1A Existed
    5. Check the continuity between AWD control unit harness connector and the ground.
    TERMINALS CONTINUITY REFERENCE CHART

    AWD control unit - Continuity
    Connector Terminal
    F108 15 Ground Not existed

    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.

  5. CHECK AWD SOLENOID POWER SUPPLY (1)
    1. Turn the ignition switch OFF.
    2. Disconnect AWD solenoid harness connector.
    3. Check the voltage between AWD control unit harness connector and ground.
      TERMINALS VOLTAGE REFERENCE CHART

      AWD control unit - Voltage
      Connector Terminal
      F108 9 Ground Battery voltage
    4. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    5. Check the voltage between AWD control unit harness connector and ground.
      TERMINALS VOLTAGE REFERENCE CHART

      AWD control unit - Voltage
      Connector Terminal
      F108 9 Ground Battery voltage

    Is the inspection result normal? 

    YES: Go to  7.

    NO: Go to 6.

  6. CHECK AWD SOLENOID POWER SUPPLY (2)
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#33).
    3. Check the harness for open or short between AWD control unit harness connector No. 9 terminal and fuse box.

    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.

  7. CHECK AWD CONTROL UNIT GROUND
    1. Turn the ignition switch OFF.
    2. Check the continuity between AWD control unit harness connector and ground.
    TERMINALS CONTINUITY REFERENCE CHART

    AWD control unit - Continuity
    Connector Terminal
    F108 10 Ground Existed
    11

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Repair or replace error-detected parts.

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