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.
Alternative Fuel Control Module
AFCM allows communication between compuvalve components and PCM. AFCM communicates desired ALT or GAS operating mode to PCM. AFCM shares information with PCM and assists in trouble shooting the bi-fuel system. If operating conditions are satisfactory and ALT/GAS fuel switch on dash is in ALT mode position, the compuvalve will signal PCM to turn gasoline fuel injectors off. If operating vehicle in ALT mode and alternative fuel source drops below a specified amount, AFCM will signal PCM to turn gasoline fuel injectors on. When this occurs, compuvalve will shut off alternative fuel supply, allowing alternative fuel and gasoline fuel systems to switch smoothly.
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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.