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 955 (Engine Controls - Introduction - (Hybrid)): Preface: Notes
This service information provides a step-by-step approach for diagnosing driveability, emission, powertrain and hybrid-electric control system symptoms. Before beginning diagnosis, it may be helpful to reference any Technical Service Bulletins (TSBs).
This service information is used in conjunction with the SYSTEM WIRING DIAGRAMS. Refer to the appropriate SYSTEM WIRING DIAGRAMS for vehicle specific wiring information and component, connector and splice location.
The following is a description of the information contained in each of the ENGINE PERFORMANCE articles.
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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.