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 33 (EEC IV Theory/Operation): Operation: Notes
The engine control system consists of the ECA, sensors and switches, and actuators. In order for the ECA to properly perform its function, it must be kept constantly informed of engine operating conditions.
It is the task of the engine sensors to supply the ECA, via electrical signal, with specific information required to determine engine operating conditions. The ECA can then send out electrical signals of its own to control air/fuel ratio, emission controls, idle speed, and ignition timing. Individual component operation is as follows:
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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.