DTC P1432: Fuel Tank Pressure Sensor Signal Low: Description
WARNING: This page is about a different car, the 2003 GMC Savana and 2003 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 Powertrain Control Module (PCM) supplies about 5 volts on the FTP sensor reference voltage circuit. The PCM also supplies a signal 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 volts. The PCM 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 sets when the FTP sensor signal voltage is below the normal operating range of the sensor.