DTC P0452: FUEL TANK PRESSURE SENSOR CIRCUIT - LOW VOLTAGE Chevrolet Venture I

Note. For circuit reference, see WIRING DIAGRAMS article.

Circuit Description

PCM monitors fuel tank pressure sensor signal to detect vacuum decay and excess vacuum during the enhanced EVAP diagnostic. Fuel tank pressure sensor measures the difference between air pressure (or vacuum) in the tank and the outside air pressure. PCM applies 5-volt reference and ground to the sensor. Sensor will return a signal voltage between 0.1-4.9 volts. If PCM detects a fuel tank pressure sensor signal that is excessively low, DTC will set.

Conditions for setting DTC

1. Ignition on.
2. Fuel tank pressure sensor signal is less than 0.3 volt.
3. Conditions present for one second.