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.
Fuel Injection System: Description
The Electronic Control Unit (ECU), (TCU) Turbocharger Control Unit (if equipped) or Electronic Control Module (ECM) controls the fuel injection system, ignition system, and turbocharger control system (if equipped). This lowers emissions while maintaining fuel economy and driveability.
The ECU governs fuel injection operation by reading data from the following sensors: oxygen sensor, crank angle sensor, vehicle speed sensor, coolant temperature sensor, airflow sensor, and throttle valve switch. Not all models use all sensors. The fuel delivery system consists of fuel tank, electric fuel pump, pressure regulator, and 4 fuel injectors.
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.
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