2011 Infiniti QX56 RWDFACTORY OEM SERVICE PROCEDURE

Diagnosis Procedure

  1. CHECK DRIVE BELT
    1. Turn ignition switch OFF.
    2. Check that the drive belt is not broken.

      Is inspection result normal? 

      YES: GO TO 2.

      NO: Replace drive belt.

  2. CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING POWER SUPPLY
    1. Disconnect electrically-controlled cooling fan coupling harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.
      VOLTAGE SPECIFICATION

      + - Voltage (Approx.)
      Electrically-controlled cooling fan coupling
      Connector Terminal
      F39 1 Ground Battery voltage

      Is inspection result normal? 

      YES: GO TO 3.

      NO: Perform trouble diagnosis for power supply circuit.

  3. CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Check the continuity between electrically-controlled cooling fan coupling harness connector and ground.
      CONTINUITY SPECIFICATION

      + - Continuity
      Electrically-controlled cooling fan coupling
      Connector Terminal
      F39 6 Ground Existed

      Is inspection result normal? 

      YES: GO TO 4.

      NO: Repair or replace error-detected parts.

  4. CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING CONTROL SIGNAL

    WITH CONSULT-III

    1. Start the engine.
    2. Perform "FAN DUTY CONTROL" in "ACTIVE TEST" mode of "ECM" with CONSULT-III.
    3. Set the Duty value to 100%.
    4. Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.
      CAUTION: Wait for 1 minute or more to measure.
      VOLTAGE SPECIFICATION

      + - Voltage (Approx.)
      Electrically-controlled cooling fan coupling
      Connector Terminal
      F39 3 Ground
      G07024501Courtesy of NISSAN MOTOR CO., U.S.A.

    WITHOUT CONSULT-III

    1. Start the engine and warm up the engine until engine coolant temperature reaches at least 98°C (209°F).
    2. Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.
      CAUTION: Wait for 1 minute or more to measure.
      VOLTAGE SPECIFICATION

      + - Voltage (Approx.)
      Electrically-controlled cooling fan coupling
      Connector Terminal
      F39 3 Ground
      G07024501Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 5.

  5. CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING CONTROL CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between electrically-controlled cooling fan coupling harness connector and IPDM E/R harness connector.
      CONTINUITY SPECIFICATION

      + - Continuity
      Electrically-controlled cooling fan coupling IPDM E/R
      Connector Terminal Connector Terminal
      F39 3 E17 72 Existed
    4. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Repair or replace error-detected parts.

  6. CHECK CAN COMMUNICATION

    Refer to "TROUBLE DIAGNOSIS FLOW CHART ".

    Is inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Repair or Replace error-detected parts.

  7. CHECK COOLING FAN SPEED SENSOR

    Refer to "DIAGNOSIS PROCEDURE ".

    Is inspection result normal? 

    YES: Replace electrically-controlled cooling fan coupling. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace error-detected parts.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.