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. If feedback system does not function properly, check input signals before replacing ECM.
| Application | Model Usage | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| A/C Clutch Signal | (1) Q45 | ||||||||
| Battery Voltage | Q45 | ||||||||
| Closed Throttle Position Switch | Q45 | ||||||||
| Crankshaft Position Sensor | Q45 | ||||||||
| EGR Temperature Sensor | Q45 | ||||||||
| Engine Coolant Temperature | Q45 | ||||||||
| Heated Oxygen Sensor | Q45 | ||||||||
| Ignition (START) Signal | Q45 | ||||||||
| Mass Airflow Sensor | Q45 | ||||||||
| Park/Neutral Switch | (3) Q45 | ||||||||
| Power Steering Pressure Switch | Q45 | ||||||||
| Secondary Throttle Sensor | (4) Q45 | ||||||||
| Sub-Crankshaft Position Sensor | Q45 | ||||||||
| Throttle Position Sensor | Q45 | ||||||||
| Vehicle Speed Sensor | (2) Q45 | ||||||||
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Use the Manual With the Right Hardware
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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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