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HOMESERVICE MANUALSFORD2021EDGE SE, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 473 (ENGINE CONTROLS - PINPOINT TESTS (DIESEL))PINPOINT TESTS KN: VARIABLE SPEED ELECTRIC COOLING FAN MOTORTEST PROCEDURE
2021 Ford Edge SE, 4WD

Test Procedure

2021 Ford Edge SE, 4WDSECTION Test Procedure
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2019 Ford Transit-350 HD, 2019 Ford Transit-350, 2019 Ford Transit-250, 2019 Ford Transit-150, and 2019 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. KN1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 

    Is DTC P0480 present? 

    Yes No
    GO to  KN4. For symptoms without DTCs, GO to  KN2.
    For all others, RETURN to SYMPTOM CHARTS for further direction.
  2. KN2 VERIFY A/C STATUS 
    • Verify the A/C system is OFF.
    • Ignition ON, engine running.
    • Access the PCM and monitor the AC_REQ (MODE) PID.

    Is A/C being requested? 

    Yes No
    REFER to the Climate Control System article, to diagnose the A/C system. For electric cooling fan(s) always on, GO to  KN3.
    For all others, GO to  KN4.
  3. KN3 CHECK THE AIR CONDITIONING PRESSURE TRANSDUCER SENSOR 
    • Ignition OFF.
    • ACP Sensor connector disconnected.
    • Ignition ON, engine running.

    Does the cooling fan turn off? 

    Yes No
    REFER to the Climate Control System article, to diagnose the Air Conditioning Pressure (ACP) Sensor. GO to  KN4.
  4. KN4 COMMAND THE COOLING FAN ON TO CHECK OPERATION 
    NOTE: Some vehicles have more than one cooling fan. Make sure both cooling fans operate correctly.
    • Ignition ON, engine OFF.
    • Access the PCM and control the FAN_DSD (PER) PID.
    • Command the fan to full ON.

    Does the cooling fan operate when commanded ON? 

    Yes No
    The concern is elsewhere. RETURN to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for further direction. GO to  KN5.
  5. KN5 CHECK THE VOLTAGE TO THE COOLING FAN 
    • Ignition OFF.
    • CF Module connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) CF Module Connector, Harness Side (-)
      FANPWR - Pin 1 Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  KN7. GO to  KN6.
  6. KN6 CHECK THE RELAY GROUND CIRCUIT 
    • Ignition OFF.
    • BJB-A connector disconnected.
    • Measure the resistance between:
      (+) BJB-A Connector, Harness Side (-)
      GND - Pin 1 Ground

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  KN7. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  7. KN7 CHECK FOR AN OPEN 
    • Ignition OFF.
    • BJB-A connector disconnected.
    • Measure the resistance between:
      (+) CF Module Connector, Harness Side (-)
      GND - Pin 2 Ground
    • Measure the resistance between:
      (+) CF Module Connector, Harness Side (-) PCM-B Connector, Harness Side
      FCV - Pin 4 FCV - Pin 34
    • Measure the resistance between:
      (+) CF Module Connector, Harness Side (-) BJB-A Connector, Harness Side
      FANPWR - Pin 1 FANPWR - Pin 20

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  KN8. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  8. KN8 CHECK THE FCV FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) CF Module Connector, Harness Side (-)
      FCV - Pin 4 Ground

    Are the resistances greater than 10k ohms? 

    Yes No
    GO to  KN9. REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.
  9. KN9 CHECK THE FCV FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) CF Module Connector, Harness Side (-)
      FCV - Pin 4 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. GO to  KN10.
  10. KN10 CHECK THE FCV FOR INTERMITTENT CONCERNS 
    • Ignition OFF.
    • BJB-A connector disconnected.
    • CF Module connector disconnected.
    • Visually inspect all connectors for:
      • pushed out pins
      • corrosion
    • BJB-A connector connected.
    • CF Module connector connected.
    • Ignition RUN Engine RUN.
    • Access the PCM and control the FAN_DSD (PER) PID.
    • Command the fan to full ON.
    • While observing the fan, wiggle, shake, and bend small sections of the wiring harness while working from the cooling fan to the PCM.

    Is a concern present? 

    Yes No
    REPAIR as necessary. If a wiring concern is not present, INSTALL a new cooling fan. REFER to the Engine Cooling article.
    Clear the PCM DTCs. REPEAT the self-test.    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
RENDER: 1.0x

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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.