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HOMESERVICE MANUALSFORD2021TRANSIT-350 HD BASE, VAN CARGO EXTENDED, 3.5L ENG VIN 8, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 500 (ENGINE CONTROLS - PINPOINT TESTS (DIESEL))PINPOINT TESTS RJ: REDUCTANT TANK LEVELTEST 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 2022 Ford F-550 Super Duty, 2022 Ford F-450 Super Duty, 2022 Ford F-350 Super Duty, 2022 Ford F-250 Super Duty, and 2021 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. RJ1 PRELIMINARY DIAGNOSIS 

    Are DTCs P203A, P203B, P203C, P203D, P203E, P206A, P206B, P206C, P206D, P21AA, P21AB, P21AF, P21B0, P21CD P2BA8, P2BA9 or U02A2 present? 

    Yes No
    For F-150, F-Series Superduty and F-650/F-750 with DTC P203A, P203B, P203C, P203D and P203E, GO to  RJ4.
    For Transit Connect with DTCs P203A, P203B, P203C, P203D or P203E, GO to  RJ4.
    For DTCs P21CD and U02A2, GO to  RJ4.
    For all others, GO to  RJ2.    		 RETURN to SYMPTOM CHARTS for further direction.
  2. RJ2 CARRY OUT A VISUAL INSPECTION 
    • Check the reductant sample for urea concentration and contamination using the appropriate test equipment, such as the Rotunda Urea Refractometer Central Tools CEN3R201 or equivalent for urea concentration, and the Rotunda Fluiddx Hydrocarbon In DEF And Antifreeze Test 328-480508 or equivalent for contamination. Refer to ENGINE CONTROL COMPONENTS , Selective Catalytic Reduction (SCR) Catalyst for additional information.
    • Visually inspect the reductant quality module, the sensor wiring and the ground connections for the following:
      • signs of excessive heat
      • damaged wiring harness or connectors
      • incorrect harness routing
      • incorrect connections
      • incorrect ground circuit connections to the frame
      • pushed out pins
      • corrosion
    • Inspect for radio frequency interference or electromagnetic interference.

    Is a concern present? 

    Yes No
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 For F-150, F-Series Superduty and F-650/F-750 with DTCs P21AA, P21AB, P21AF and P21B0, GO to  RJ4.
    For all others, GO to  RJ3.
  3. RJ3 CHECK REDUCTANT FOR PROPER CONCENTRATION 
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the DEF_CONC (PER) PID.

    Is the DEF sample within 2% of the PID reading? 

    Yes No
    The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
    Clear the PCM DTCs. REPEAT the self-test.    		 Remove the DEF tank and drain fluid. Refer to the appropriate Emission Control article. Replace fluid with known good DEF.
    Clear the PCM DTCs. REPEAT the self-test.
  4. RJ4 CHECK THE VOLTAGE TO THE REDUCTANT QUALITY MODULE 
    • Ignition OFF.
    • Reductant Quality Module connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
    (+) Reductant Quality Module Connector, Harness Side (-)
    VPWR Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  RJ5. REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  5. RJ5 CHECK THE REDUCTANT QUALITY MODULE CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • PCM-B connector disconnected.
    • Measure the resistance between:
      (+) Reductant Quality Module Connector, Harness Side (-)
      GND Ground
    • Measure the resistance between:
    (+) Reductant Quality Module Connector, Harness Side (-) PCM-B Connector, Harness Side
    CAN2+ CAN2+
    CAN2- CAN2-

    Are the resistances less than 5 ohms? 

    Yes No
    INSTALL a new Reductant Quality module. REFER to the appropriate Engine Emission Control article.
    Clear the PCM DTCs. REPEAT the self-test.    		 REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
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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.