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.
Sensor PWM Circuit
The FRT sensor information is required by the PCM for fuel trim adjustment. The FTP and FTT sensors information is required by the PCM for fuel gage operation. The PCM does not have the ability to supply and monitor the FRT, FTP and FTT sensors. The FICM performs this task by supplying the sensors a 5-volt reference, low reference and signal circuit. The signal voltage of the sensors are converted into a PWM signal. The PWM signal is sent to the PCM through a dedicated circuit. The PCM converts the PWM signal into pressure and temperature values.
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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.