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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Transfer Case (Exc Hybrid)) >> DTC/Circuit Diagnosis >> DTC C1204: AWD Solenoid >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.

  1. CHECK AWD SOLENOID 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
      Connector Terminal
      M42 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
      M42 9 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    GO TO STEP 2  .

  2. CHECK AWD SOLENOID POWER SUPPLY (2)

    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#70)
    3. Check the harness for open or short between AWD control unit harness connector No. 9 terminal and 10A (#70).

    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 AWD CONTROL UNIT GROUND

    Check the continuity between AWD control unit harness connector and ground.

    AWD control unit - Continuity
    Connector Terminal
    M42 10 Ground Existed
    11

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair or replace error-detected parts.

  4. CHECK AWD SOLENOID CIRCUIT (1)

    Check the resistance between AWD control unit terminals.

    AWD control unit Resistance (Approx.)
    Connector Terminal
    M42 1 2 2.45 Ω

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    GO TO STEP 5  .

  5. CHECK AWD SOLENOID CIRCUIT (2)

    1. Disconnect AWD solenoid harness connector.
    2. Check the continuity between AWD control unit harness connector and AWD solenoid harness connector.
      AWD control unit AWD solenoid Continuity
      Connector Terminal Connector Terminal
      M42 1 F48 1 Existed
      2 2
    3. Check the continuity between AWD control unit harness connector and the ground.
      AWD control unit - Continuity
      Connector Terminal
      M42 1 Ground Not existed
      2

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Repair or replace error-detected parts.

  6. CHECK AWD SOLENOID

    Check AWD solenoid. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    AWD solenoid is malfunctioning. Replace electric controlled coupling. Refer to DISASSEMBLY  and ASSEMBLY .

  7. CHECK TERMINALS AND HARNESS CONNECTORS

    • Check AWD control unit pin terminals for damage or loose connection with harness connector.
    • Check AWD solenoid pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES 

    Replace AWD control unit. Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair or replace error-detected parts.

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