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)
The ECU is mounted behind passenger's kick panel and controls all ECI functions. The ECU consists of a printed circuit board enclosed within a metal box. The ECU receives various signals from sensors and switches. These signals are processed by the ECU for controlling fuel delivery, EGR, solenoid valve for pressure sensor, idle speed and air injection system.
During closed loop operation, the ECU stores the mean values of feedback signals used to maintain 14.7:1 air fuel ratio. During open loop operation, the ECU uses these mean values to modify preprogrammed information. By doing this, the ECU can more closely control exhaust emissions even when engine is in open loop mode of operation.
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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.