General Information

P0450 Evaporative Emission System Pressure Sensor/Switch

General Information

Component Location





General Description

The evaporative emissions system prevents hydrocarbon (HC) vapors from the fuel tank from escaping into the atmosphere where they could form photochemical smog. The fuel tank pressure sensor is a component of the evaporative emission system.
The Tank Pressure Sensor converts fuel tank pressure to a proportional analog voltage signal which is read by the engine controller for evaluation during execution of the Evaporative System Diagnostic. The Tank Pressure may be below atmospheric pressure (ie. a vacuum) or above atmospheric pressure. The fuel tank pressure is used to measure the difference between the air pressure (or vacuum) in the fuel tank and the ambient air pressure. PCM supplies a 5-volt reference and a ground to the sensor, which allows the sensor's output voltage to range from 0.1 to 4.9 volts.

DTC Description

If the differential tank pressure change is over 17 lbf/ft2 during 25.5 sec under low speed condition, PCM sets DTC P0450.

DTC Detecting Condition





Specification





Schematic Diagram