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 and Emission Control System Description
The engine and emission control system is divided into 4 major sub-systems: air intake system, fuel delivery system, electronic control system and emission control system.
The air intake system includes air cleaner, mass air flow sensor, throttle body, IMT (Intake Manifold turning) valve and intake manifold.
The fuel delivery system includes fuel pump, delivery pipe, fuel pressure regulator, fuel injectors, etc. The electronic control system includes ECM, various sensors and controlled devices.
The emission control system includes EVAP and PCV systems.
When hoses are disconnected and system components are removed for service, be sure to reinstall components properly and route and connect hoses correctly after service. Refer to the figure below for proper routing of hoses.
NO RELATED
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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.