Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Section 504 (Engine Controls - Introduction (Diesel)): Introduction: Preface: Notes
This article provides a step-by-step approach for diagnosing driveability, emission, and powertrain control system symptoms. Before beginning diagnosis, it may be helpful to reference any Technical Service Bulletins (TSBs) or On-line Automotive Service Information System (OASIS) information when this is available. TSB and OASIS information is available on either the Professional Technician Society (PTS) or Motorcraft® website.
This article is used in conjunction with the Service Information and Wiring Diagrams articles. The Service Information articles are used to provide additional diagnostic or component removal and installation information. Refer to the Wiring Diagrams article for vehicle specific wiring information and component, connector, and splice locations.
The following is a description of the information contained in each article.
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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.