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
PCM controls fuel system by varying fuel injector pulse width and duration based upon sensor input signals. If feedback system does not function properly, check A/C clutch signal, battery voltage, closed throttle position switch, Crankshaft Position Sensor (CKP), EGR temperature sensor, Engine Coolant Temperature (ECT), Heated Oxygen Sensors (HO2S), ignition (START) signal, Mass Airflow (MAF) sensor, park/neutral switch, power steering pressure switch, secondary throttle sensor, sub-crankshaft position sensor, Throttle Position (TP) sensor, Vehicle Speed Sensor (VSS) input signals before replacing PCM.
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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