Perform a diagnostic scan using an OBD-II scanner to retrieve stored trouble codes, freeze frame data, and monitor live sensor data on the vehicle's electronic control modules.

Warnings

Tools required

Preparation

1. Ensure the vehicle is parked on level ground in a well-ventilated area
2. Turn off all vehicle accessories (radio, climate control, lights)
3. Have the vehicle's VIN and current mileage available for documentation
4. Ensure the scan tool is updated with the latest software for 2015-2020 Ford F-150 compatibility

Procedure

1. 1

   Locate the OBD-II diagnostic port
   The OBD-II port is located under the driver's side dashboard, to the left of the steering column near the hood release lever. It is a 16-pin trapezoidal connector. Remove any covers or panels if necessary to access the port.
2. 2

   Connect the scan tool
   With the ignition off, firmly plug the OBD-II scan tool into the diagnostic port until it clicks into place. Ensure the connection is secure to prevent communication errors during the scan.
3. 3

   Turn ignition to ON position
   Turn the ignition key to the ON/RUN position without starting the engine, or press the start button twice without pressing the brake pedal. The scan tool should power on and establish communication with the vehicle's modules. Wait for the scan tool to initialize.
4. 4

   Enter vehicle information
   Select the correct vehicle make (Ford), year (2015-2020), model (F-150), and engine (5.0L V8) in the scan tool menu. Some advanced scanners may auto-detect this information via the VIN.
5. 5

   Perform global module scan
   Select 'Global Scan' or 'Scan All Modules' to check all electronic control modules in the vehicle, including PCM (Powertrain Control Module), ABS, TPMS, BCM (Body Control Module), RCM (Restraint Control Module), and HVAC. This provides a comprehensive view of all system faults.
6. 6

   Retrieve diagnostic trouble codes
   Record all stored DTCs (Diagnostic Trouble Codes) and pending codes from each module. Note the code number, description, and which module reported each code. Pay special attention to codes from the PCM related to engine, transmission, and emissions systems.
7. 7

   Review freeze frame data
   Access freeze frame data for each stored DTC. This data captures operating conditions (RPM, coolant temperature, vehicle speed, fuel trim, etc.) at the moment the fault was detected. Record this information as it helps diagnose intermittent problems.
8. 8

   Check readiness monitors
   Review the OBD-II readiness monitors (also called I/M monitors) to determine if all emission system self-tests have completed. The 5.0L V8 F-150 should show 'Ready' status for Catalyst, Heated Catalyst, Evaporative System, Secondary Air, Oxygen Sensor, and EGR monitors when all drive cycles are complete.
9. 9

   View live data stream
   Select 'Live Data' or 'Data Stream' to monitor real-time sensor values while the engine is running (if diagnosis requires it). Key parameters for the 5.0L Coyote V8 include MAF sensor readings, fuel trims (short and long term), oxygen sensor voltages, coolant temperature, intake air temperature, and ignition timing. Compare values against known good specifications.
10. 10

    Document all findings
    Write down or save all DTCs, freeze frame data, readiness monitor status, and any abnormal live data readings. Note the date, mileage, and any customer complaints or symptoms. This documentation is critical for proper diagnosis and repair planning.
11. 11

    Turn off ignition and disconnect scanner
    Turn the ignition key to the OFF position or press the start button to power down the vehicle. Wait for the scan tool to complete any data logging, then carefully disconnect the scan tool from the OBD-II port.

Reassembly

1. Reinstall any panels or covers that were removed to access the OBD-II port
2. Store the scan tool properly and ensure all diagnostic data has been saved or documented

Verification

• Review all documented codes and data to identify the root cause of any issues
• Cross-reference DTCs with Ford technical service bulletins (TSBs) for known issues on 2015-2020 F-150 5.0L V8 models
• If codes were cleared during diagnosis, verify that they do not immediately return after starting the engine
• Confirm readiness monitors are set appropriately for the diagnostic stage (all monitors should be 'Ready' for emissions testing after repair and drive cycles are complete)
• Use diagnostic information to create a repair plan addressing all identified faults in order of priority

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