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 System
The electronic control system monitors engine operating conditions, processes these conditions, and then controls the engine for optimum performance and minimum emissions.
Input signals are generated by the Engine Coolant Temperature (ECT) sensor, Mass Airflow (MAF) sensor, Exhaust Oxygen (O2) sensor, Throttle Position Sensor (TPS), Park and Neutral switch, and Vehicle Speed Sensor (VSS). Sunbird and Skyhawk 1.8L turbo and Fiero 2.8L use Manifold Air Temperature (MAT) sensor and Manifold Absolute Pressure (MAP) sensor instead of MAF sensor.
The ECM also receives signals from the starter solenoid, the air conditioner selector switch and the ignition distributor.
NO RELATED
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.