SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD2021TRANSIT-350 HD BASE, VAN CARGO EXTENDED, 3.5L ENG VIN 8, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 13 (ENGINE CONTROLS - PINPOINT TESTS (DIESEL))PINPOINT TESTS MX: FUEL CONTROLTEST PROCEDURE
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWD

Test Procedure

2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWDSECTION Test Procedure
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. MX1 CHECK THE EGR VALVE POSITION VALUES 
    NOTE: DTC P0170 may be accompanied by other DTCs. Diagnose all other DTCs before entering this pinpoint test.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the EGRVP (VOLT) PID.
    • Monitor the EGRVP PID and compare the values to the EGR valve position sensor table.
    • Access the PCM and control the EGRVPDES (PER) PID.
    • Increase the EGRVPDES PID to 100%.
    EGR VALVE POSITION SENSOR (APPROXIMATE)

    EGR Command EGR V Minimum EGR V Maximum
    0% (F-150 and Transit) 5% (all others) 0.4 V (F-150) 0.71 V (Transit) 0.61 V (F-650/F-750) 0.68 V (all others) 0.6 V (F-150) 0.90 V (Transit) 1.14 V (F-650/F-750) 1.14 V (all others)
    60% (F-150) 100% (Transit) 70% (all others) 2.75 V (F-150) 3.60 V (Transit) 1.903 V (F-650/F-750) 2.72 V (all others) 3.05 V (F-150) 3.82 V (Transit) 3.082 V (F-650/F-750) 3.35 V (all others)

    Does the EGR position volts value approximately match the values in the EGR Valve Position Sensor (Approximate) table? 

    Yes No
    GO to  MX2. A concern is present in the EGR system. Follow the symptoms without DTCs direction in the pinpoint test.
    GO to PINPOINT TEST W .
  2. MX2 INTERMITTENT MAF SENSOR CHECK 
    NOTE: The MAF_HZ PID value fluctuates while the engine is running.
    • Ignition ON, engine running.
    • Access the PCM and control the EGRTP_CMD (PER) PID.
    • Decrease the EGRTP_CMD PID to 0%.
    • Access the PCM and control the VGTDC (PER) PID.
    • Decrease the VGTDC PID to 0%.
    • Access the PCM and control the EGRVPDES (PER) PID.
    • Decrease the EGRVPDES PID to 0%.
    • Access the PCM and monitor the MAF_HZ (FREQ) PID.
    • Record the MAF_HZ PID high and low values.
    • Set the scan tool MAF_HZ PID graph limits 0.2 kHz above and below the previously recorded high and low values.
    • While observing the PID, lightly tap on the MAF/IAT sensor and wiggle the harness from the MAF/IAT sensor to the PCM.

    Does the MAF_HZ PID value exceed the set limits range? 

    Yes No
    A concern is present in the MAF system. Follow the symptoms without DTCs direction in the pinpoint test.
    GO to PINPOINT TEST J .    		 GO to  MX3.
  3. MX3 CHECK THE MAF SYSTEM OPERATION 
    • Ignition ON, engine running.
    • Access the PCM and control the EGRTP_CMD (PER) PID.
    • Decrease the EGRTP_CMD PID to 0%.
    • Access the PCM and control the VGTDC (PER) PID.
    • Decrease the VGTDC PID to 0%.
    • Access the PCM and control the EGRVPDES (PER) PID.
    • Decrease the EGRVPDES PID to 0%.
    • Access the PCM and monitor the MAF_HZ (FREQ) PID.
    • Monitor the MAF_HZ PID at idle and record the value.
    • Access the PCM and control the RPMDSD (RPM) PID.
    • Increase the engine speed to 1, 200 RPM.
    • Record the MAF_HZ PID value.
    • Increase the engine speed to 2, 000 RPM.
    • Record the MAF_HZ PID value.

    Is the MAF_HZ PID value between 3.5-3.8 kHz (Transit) 3.5-3.9 kHz (all others) at idle, 4.1-4.4 kHz (Transit) 4.5-5.4 kHz (all others) at 1, 200 RPM and 5.0-5.4 kHz (Transit) 5.8-6.3 kHz (all others) at 2, 000 RPM? 

    Yes No
    GO to  MX4. A concern is present in the MAF system. Follow the symptoms without DTCs direction in the pinpoint test.
    GO to PINPOINT TEST J .
  4. MX4 TURBOCHARGER SYSTEM PERFORMANCE 
    NOTE: Visually inspect the vehicle for aftermarket accessories and performance modifications (air filter, exhaust system, intake system, performance chip, turbocharger). Refer to ENGINE CONTROL (EC) SYSTEM , Modifications to OBD Vehicles.
    • Check for modifications to the electronic engine control (EEC) system.
    • Visually inspect the intake air system for the following:
      • restricted or modified air filter or housing
      • water intrusion
      • worn gaskets between the mass air flow (MAF) sensor and the air cleaner assembly
      • exhaust gas recirculation (EGR) valve gasket leak to EGR cooler
      • verify the integrity of the crankcase ventilation system
      • incorrectly seated engine oil dipstick, tube or oil fill cap
      • leaks or restrictions in the charge air cooler (CAC)
      • low CAC coolant level
      • leaks, cracks, loose connections, punctures, or any other non-factory modifications
    • Visually inspect the exhaust system for the following:
      • tailpipe modifications that increase or decrease the exhaust restriction
      • leaks, cracks, loose connections, punctures, or any other non-factory modifications

        Is a concern present? 

        Yes No
        REPAIR as necessary.
        Clear the PCM DTCs. REPEAT the self-test.        		 GO to  MX5.
  5. MX5 CHECK THE CHARGE AIR COOLER, AIR INTAKE AND EXHAUST SYSTEMS FOR LEAKS AND RESTRICTIONS 
    NOTE: Strict observance of posted speed limits and attention to driving conditions are mandatory when carrying out the road test. Failure to follow these instructions may result in personal injury.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

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

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote 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.