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Home >> Chevrolet >> 2005 >> Venture Base, Van Cargo Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.4L DTC P0446 To P1640 >> DTC Tests >> DTC P0453 >> Circuit Description

Circuit Description

The fuel tank pressure (FTP) sensor measures the difference between the air pressure or vacuum in the evaporative emission (EVAP) system, and the outside air pressure. The control module supplies a 5-volt reference and a low reference circuit to the FTP sensor. The FTP sensor signal circuit voltage varies depending on EVAP system pressure or vacuum. If the FTP sensor signal voltage increases above a calibrated value, this DTC sets.

The following table illustrates the relationship between FTP sensor signal voltage and the EVAP system pressure/vacuum.

DTC P0453

FTP Sensor Signal Voltage Fuel Tank Pressure
High, Approximately 1.5 Volts or More Negative Pressure/Vacuum
Low, Approximately 1.5 Volts or Less Positive Pressure
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