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.
Electronic Control Unit (Ecu): Notes
The ECU controls injection by signals received from sensors which detect exhaust gas oxygen content, coolant temperature, manifold absolute pressure, engine speed and air/fuel temperature. The ECU processes this information to determine engine operating conditions. It then provides output control signals to regulate air/fuel ratio, ignition, idle speed and emission control devices. This permits optimum engine performance with minimum emissions. The ECU adjusts automatically for changes in altitude. The ECU is located under the instrument panel on the passenger side of the vehicle. See Fig 1 .
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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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