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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 669 (Fuel System - General Information - 3.5L V6 POWERBOOST (CN)) >> Diagnosis And Testing >> Fuel System >> Pinpoint Test(s) >> Pinpoint Test C: P04B4

Pinpoint Test C: P04B4

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  1. Normal Operation and Fault Conditions 

    REFER to: Fuel System - Overview .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P04B4:00 Refueling Vapor Control Valve Stuck Closed: No Sub Type Information Refueling Valve (RV) stuck closed

    Possible Sources 

    • Fuel filler pipe
    • FTP Sensor
    • Fuel Vapor Vent Valve

  2. C1 CHECK THE REFUELING VALVE STUCK CLOSED

    • Press the Refuel Door request button.

    • Confirm FTP_H20 PID

    Does the Tank Pressure drop to less than 0.25 PSI (6.92 In.H20)? 

    Yes  GO to  C3
    No  GO to  C2

  3. C2 CHECK THE FTP (FUEL TANK PRESSURE) SENSOR VOLTAGE WITH THE CAPLESS FUEL TANK FILLER PIPE OPENED

    • Gently release the fuel door using the mechanical release lever located in the trunk.

    • Install the supplemental refuelling adaptor provided with the vehicle to open the capless fuel tank filler pipe.

    • KOEO

    • Access the PCM and monitor the FTP (VOLT) PID.

      Access the PCM and monitor the FTP_V (V) PID

    Is FTP (Fuel Tank Pressure) Voltage reading between 1.4V -1.54 V? 

    Yes  GO to  C3
    No  INSTALL a new FTP sensor. REFER to: Fuel Tank Pressure Sensor and Tube .

  4. C3 CHECK THE FVVV CIRCUIT FOR AN OPEN

    • Using the diagnostic scan tool, perform a KOEO self test on the PCM.

    • Ignition OFF.

    • Disconnect the Fuel Vapor Vent Valve (FVVV) connector C4287.

    • Disconnect the PCM connector C175E. C4287.

    • Check for the resistance on the Fuel Vapor Vent Valve.

    • Measure the resistance as below:
      Positive Lead Measurement / Action Negative Lead
      C4287-1
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C4287-2

    Is Resistance between 7.5 - 9.5 ohms at 14v DC? 

    Yes  GO to  C4
    No  Replace the FVVV (Fuel Vapor Vent Valve).

  5. C4 CHECK FOR OPEN FVVV CIRCUIT TO TESTING FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect fuel tank vapor vent valve C4287.

    • KOEO

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Fuel vapor vent valve (FVVV) C4287-1
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C175E-24

    Is the resistance less than 5 ohms? 

    Yes  GO to  C5
    No  Repair the open circuit. Clear the PCMDTCs. REPEAT self-test.

  6. C5 CHECK FUEL VAPOR VENT VALVE (ALSO KNOWN AS THE REFUELING VALVE) CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Ignition starts or run condition.

    • Measure Voltage as below.
      Positive Lead Measurement / Action Negative Lead
      Fuel vapor vent valve (FVVV) C4287-2
      GFD559498Courtesy of FORD MOTOR COMPANY
      		 Ground
      Fuel vapor vent valve (FVVV) C4287-1
      GFD559498Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  Problem is intermittent. Look for signs of visual damage on the connector pins and FVVV pins. Clear Codes and Send Vehicle out.
    No  Look for wiring issues and repair as necessary.
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