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Home >> Infiniti >> 2018 >> Q70 5.6 Luxe, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Transfer Case (DTC/Circuit Diagnosis) (Except Hybrid)) >> 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.

      AWD Control Unit

      --

      Voltage (Approx.)

      Connector

      Terminal

      B17

      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.

      AWD Control Unit

      --

      Voltage

      Connector

      Terminal

      B17

      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 10 A fuse (No. 46).
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between AWD Control Unit harness connector and IPDM E/R harness connector.

      AWD Control Unit

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B17

      7

      E5

      12

      Existed

    5. Check the continuity between AWD Control Unit harness connector and the ground.

      AWD Control Unit

      --

      Continuity

      Connector

      Terminal

      B17

      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.

      AWD Control Unit

      --

      Voltage (Approx.)

      Connector

      Terminal

      B17

      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.

      AWD Control Unit

      --

      Voltage

      Connector

      Terminal

      B17

      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 10 A fuse (No. 9).
    3. Disconnect fuse block (J/B) harness connector.
    4. Check the continuity between AWD Control Unit harness connector and fuse block (J/B).

      AWD Control Unit

      Fuse block (J/B)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B17

      15

      M1

      4A

      Existed

    5. Check the continuity between AWD Control Unit harness connector and the ground.

      AWD Control Unit

      --

      Continuity

      Connector

      Terminal

      B17

      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.

      AWD Control Unit

      --

      Voltage

      Connector

      Terminal

      B17

      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.

      AWD Control Unit

      --

      Voltage

      Connector

      Terminal

      B17

      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 10 A fuse (No. 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.

      AWD Control Unit

      --

      Continuity

      Connector

      Terminal

      B17

      10

      Ground

      Existed

      11

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Repair or replace error-detected parts.