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 Module (ECM)
ECM receives signals from O2 sensor, thermosensor and engine speed sensor to adjust Air/fuel ratio to proper level.
Air/fuel ratio is judged to be rich when voltage produced by O2 sensor is higher than a set specified level. As a result, ECM signals duty solenoid to pass a greater quantity of air into carburetor. This additional air leans air/fuel mixture.
Air/fuel ratio is judged to be lean when voltage produced by O2 sensor is lower than a set specified level. As a result, ECM issues signals to duty solenoid to pass a less air into carburetor. The elimination of air enriches air/fuel mixture.
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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