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Circuit/System Description: Notes

The FTP sensor is used to detect any unexpected pressure in the EVAP system. The PCM supplies a 5-volt reference, an electrical ground, and a signal return circuit that has a 5-volt bias. The FTP sensor contains a silicon based chip that changes electrical resistance when pressure is applied. The sensor converts the positive or the negative pressure into an electrical signal and sends the signal to the PCM.

Fuel Tank Vapor Space FTP mmHg FTP Signal Voltage
Pressure Positive Value High
No Pressure Near Zero 3.0-3.6V
Vacuum Negative Value Low
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