DTC P1432: Fuel Tank Pressure Sensor Signal Low: Description
WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
The Fuel Tank Pressure (FTP) sensor is a pressure transducer. The Alternative Fuels Engine Control Module (AF ECM) supplies about 5 volts on the FTP sensor reference voltage circuit. The AF ECM also supplies a ground circuit to the FTP sensor. When fuel level/tank pressure is full the FTP signal voltage rises to 4.1 volts. As fuel level/tank pressure decreases to empty, the FTP signal voltage drops to around 0.5 volt. The AF ECM monitors the FTP signal circuit voltage and the Fuel Tank Temperature (FTT) sensor and determines the amount of fuel within the fuel tank.
This DTC is used to indicate a FTP sensor signal voltage that is below the normal operating range of the sensor.