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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 ZZ: INTERMITTENTTEST 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. ZZ1 DIRECTION FOR INTERMITTENT DIAGNOSTIC PATH 
    NOTE: Proceed with this step only if the PCM DTCs and the freeze frame data have not been cleared. Record freeze frame data prior to clearing the PCM DTCs. Clearing the DTCs clears any freeze frame data and eliminates FMEM. This helps to recreate the original conditions that set the DTCs or caused the symptom.
    • Ignition ON, engine OFF.
    • Clear the PCM DTCs.

    Are the PCM DTCs cleared? 

    Yes No
    GO to  ZZ2. CLEAR the PCM DTCs. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) . REPEAT the self-test.
  2. ZZ2 SELECT THE PIDS AND/OR SIGNALS RELATED TO THE SYSTEM 
    • A list of related PIDs and/or signals are needed for use with the scan tool to monitor the suspect areas. Obtain the customer symptom description. Use the Reference Value Symptom chart and proceed to the Reference Value PID/Signal Measurement chart located at the beginning of REFERENCE VALUES .
    • Highlight each available PID/signal recommended by the charts under the PID/signal selection menu on the scan tool.

    Are all available PIDs/signals related to the symptom selected? 

    Yes No
    GO to  ZZ3. REPEAT the test step. GO to  ZZ2.
  3. ZZ3 DECISION TO VERIFY THE SYMPTOM 
    NOTE: The path to symptom verification is optional but is recommended for several reasons. For example, the vehicle is back for a repeat repair, or there is no DTC present.

    Is a concern or symptom present? 

    Yes No
    GO to  ZZ10. GO to  ZZ4.
  4. ZZ4 COLLECT ANY SYMPTOM RELATED DATA TO AID IN VERIFICATION 
    NOTE: Only MIL codes trigger freeze frame data. Refer to the scan tool instruction manual to retrieve the freeze frame information.
    • Prepare the freeze frame data for use with information from the SYMPTOM CHARTS .
    • Check for continuous memory DTCs that should have been recorded from an earlier pinpoint test.
    • Access the information from the customer information worksheet and the customer if available. Access any other symptom related data available, such as TSBs and OASIS reports.

    Is all available data recorded? 

    Yes No
    GO to  ZZ5. GATHER as much data as possible to aid in isolating the intermittent concern area. REPEAT the test step. GO to  ZZ4.
  5. ZZ5 RECREATE THE SYMPTOM USING ALL AVAILABLE DATA 
    NOTE: To recreate the original conditions that set the DTC or caused the symptom, the vehicle may require driving.
    • With the scan tool, select and monitor the same PIDs as displayed in freeze frame along with any previously selected PIDs/signals from step ZZ2. Using the freeze frame data recorded earlier, recreate the conditions described by each freeze frame PID. Pay special attention to ECT, LOAD, RPM and VSS. Also, use any available data from the customer, TSBs, and other sources to aid in producing the correct conditions for recreating the symptom.
    • When the symptom occurs, press the trigger to begin recording. Refer to the scan tool instruction manual for information on the recorder function.

    Can the symptom be recreated? 

    Yes No
    GO to  ZZ10. GO to  ZZ6.
  6. ZZ6 RECREATE THE SYMPTOM 
    NOTE: PIDs for output in the Reference Value Charts represent command values only. Circuit measurements with a DMM indicate the actual output status. Therefore, in the case of a concern, the PID and circuit reading on the vehicle may not correspond with each other. PIDs for PCM circuits with a mismatch in the DMM measurement indicate a possible PCM concern.
    • The road test is the last attempt to locate the area of concern before physically disturbing vehicle circuits.
    • The Intermittent Road Test Procedure is a set of instructions for monitoring PIDs/signals with a scan tool and circuit measurements with a DMM. This is done under 4 different conditions - ignition ON and engine OFF, hot idle, 48 km/h (30 mph) and 88 km/h (55 mph). Use the typical diagnostic reference values from REFERENCE VALUES to compare with the actual vehicle.
    • Locate the correct reference value chart in REFERENCE VALUES .
    • Setup the vehicle to measure the circuits with a DMM and a scan tool.
    • Connect a scan tool to the DLC.
    • Ignition ON, engine OFF.
    • With the scan tool, select and monitor PIDs and measure the circuits shown in the reference value chart in REFERENCE VALUES .
    • Compare the scan tool PIDs and DMM values to the reference value charts.

    Are any values out of range? 

    Yes No
    GO to  ZZ10. GO to  ZZ7.
  7. ZZ7 RECREATE THE SYMPTOM USING THE HOT IDLE ROAD TEST 
    NOTE: The engine temperature should be at least 87°C (189°F).
    • Ignition ON, engine running.
    • Continue to monitor the PIDs and circuits as in the previous step.

    Are any values out of range? 

    Yes No
    GO to  ZZ10. GO to  ZZ8.
  8. ZZ8 RECREATE THE SYMPTOM DURING AN 48 KM/H (30 MPH) ROAD TEST 
    • Drive the vehicle on a preplanned route.
    • Continue to monitor the PIDs and circuits as in the previous step.

    Are any values out of range? 

    Yes No
    GO to  ZZ10. GO to  ZZ9.
  9. ZZ9 RECREATE THE SYMPTOM DURING AN 88 KM/H (55 MPH) ROAD TEST 
    • Continue to drive the vehicle on the preplanned route.
    • Continue to monitor the PIDs and circuits as in the previous step.

    Are any values out of range? 

    Yes No
    GO to  ZZ10. It is now necessary to physically disturb the selected vehicle circuits in an attempt to recreate the intermittent concern.
    GO to  ZZ10.
  10. ZZ10 SELECT THE CIRCUITS FROM THE PCM PIDS/SIGNALS CHART 
    NOTE: From the same chart, be sure to select and proceed with the appropriate test type.
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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.