This procedure covers performing a diagnostic scan on a 2015-2020 Ford F-150 with 3.5L EcoBoost engine to retrieve stored trouble codes and system data using an OBD-II scanner.

Warnings

Tools required

Preparation

1. Park vehicle on level surface and apply parking brake
2. Turn off all accessories (radio, climate control, lights)
3. Ensure vehicle battery is in good condition with at least 12.4V to prevent communication errors
4. Gather any customer complaint information or symptoms to correlate with scan results

Procedure

1. 1

   Locate 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 typically facing downward.
2. 2

   Connect scan tool
   Firmly plug the OBD-II scan tool connector into the diagnostic port until it clicks into place. Ensure the connection is secure to prevent communication interruptions during scanning.
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 depressing the brake pedal. Wait for all dashboard warning lights to illuminate and the scan tool to power on and establish communication.
4. 4

   Initialize scan tool communication
   Allow the scan tool to automatically detect the vehicle. Verify it displays '2015-2020 Ford F-150' and '3.5L V6 EcoBoost'. If manual selection is required, choose the correct year, make, model, and engine. Wait for the tool to establish communication with all vehicle modules.
5. 5

   Perform global module scan
   Select the option to scan all control modules (often labeled 'Global Scan' or 'Scan All Systems'). This will interrogate the PCM (Powertrain Control Module), TCM (Transmission Control Module), ABS, BCM (Body Control Module), RCM (Restraint Control Module), and other systems. Note the total number of modules detected and any communication failures.
6. 6

   Record all diagnostic trouble codes
   Document all DTCs (Diagnostic Trouble Codes) from every module, including code number, description, and status (current, pending, or history). Pay special attention to P-codes (powertrain), B-codes (body), C-codes (chassis), and U-codes (network communication). Note any codes related to the turbocharger system, direct fuel injection, or variable valve timing specific to the EcoBoost engine.
7. 7

   Capture freeze frame data
   For each current or pending DTC, access and record the freeze frame data showing operating conditions when the code was set (RPM, vehicle speed, coolant temperature, fuel trim values, etc.). This contextual information is critical for accurate diagnosis.
8. 8

   Review live data streams
   Access live data PIDs (Parameter IDs) to observe real-time sensor readings. For the 3.5L EcoBoost, monitor critical parameters including both turbocharger boost pressures, fuel rail pressure (should be 2000+ PSI at idle), oxygen sensor voltages, MAF sensor readings, coolant temperature, and transmission fluid temperature. Compare readings to known-good specifications.
9. 9

   Check readiness monitors
   Review emission monitor readiness status. Note any monitors showing 'Not Ready' or 'Incomplete', as this indicates the vehicle has not completed the required drive cycle after a recent code clear or battery disconnect. All monitors except EVAP may complete with normal driving; some may require specific conditions.
10. 10

    Document findings and save report
    Create a comprehensive report including all DTCs, freeze frame data, failed monitors, and any abnormal live data readings. If using a professional scan tool, save the scan session to the tool's memory or export to a file for future reference. Include the current mileage and date of the scan.
11. 11

    Disconnect scan tool
    Turn the ignition to the OFF position. Disconnect the scan tool from the OBD-II port by pressing any release tabs and pulling straight out. Store the scan tool properly.

Reassembly

1. No reassembly required for diagnostic scan procedure

Verification

• Verify all DTCs and freeze frame data have been accurately recorded before clearing any codes
• Confirm scan tool successfully communicated with all expected modules (typically 15-20 modules on F-150)
• If performing pre-repair diagnosis, use scan data to develop a diagnostic plan before proceeding with repairs
• If performing post-repair verification, confirm all related DTCs have cleared and monitors show ready status after appropriate drive cycle

More procedures for this vehicle