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 Mode Operation
The PCM opens the AF enable circuit when operating on CNG. When the AF enable circuit is open the FICM will operate the CNG injectors based upon the PCM pulse width signals. The FICM will convert the FRT, FTP and FTT sensors voltage signals to PWM signals that the PCM monitors for fuel trim and fuel gage adjustment. The PCM also monitors the FICM status signal circuit for proper FICM operation.
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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.