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.
Engine Controls - Introduction - (Hybrid): Introduction: Preface: Notes
This article provides a step-by-step approach for diagnosing driveability, emission, powertrain and hybridelectric 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. The TSB/OASIS information is available on the Professional Technician Society (PTS) or Motorcraft® website.
This article is used in conjunction with the Workshop and Wiring Diagrams articles. The Workshop article is used to provide additional diagnostics when directed by this article. The Workshop article is also used for component removal and installation information. Refer to the Wiring Diagrams for vehicle specific wiring information and component, connector and splice location.
The following is a description of the information contained in each part of this article.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.