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.
Fuel Control: Notes
ECM controls fuel system based upon sensor input signals. See FUEL CONTROL SYSTEM INPUT SIGNALS table. If feedback system does not function properly, check input signals before replacing ECM.
| Application | Model Usage | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A/C Clutch Signal | G20 & (1) Q45 | ||||||||||||||
| Mass Airflow Sensor | G20, J30 & Q45 | ||||||||||||||
| Battery Voltage | G20, J30 & Q45 | ||||||||||||||
| Crankshaft Position Sensor | G20, J30 & Q45 | ||||||||||||||
| Engine (Coolant) Temperature | G20, J30 & Q45 | ||||||||||||||
| EGR Temperature Sensor (2) | G20, J30 & Q45 | ||||||||||||||
| Fuel Temperature Sensor | J30 | ||||||||||||||
| Ignition (START) Signal | G20, J30 & Q45 | ||||||||||||||
| Neutral Switch | (3) G20 | ||||||||||||||
| Heated Oxygen Sensor | G20, (4) J30 & (4) Q45 | ||||||||||||||
| Park/Neutral (Inhibitor) Switch | G20, (5) J30 & (6) Q45 | ||||||||||||||
| Power Steering Pressure Switch | G20, J30 & Q45 | ||||||||||||||
| Secondary Throttle Sensor | (7) Q45 | ||||||||||||||
| Sub-Crankshaft Position Sensor | Q45 | ||||||||||||||
| Throttle Position Sensor | G20, J30 & Q45 | ||||||||||||||
| Closed Throttle Position Switch | J30 & Q45 | ||||||||||||||
| Vehicle Speed Sensor | G20, J30 & (5) Q45 | ||||||||||||||
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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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