General Information

Component Location





General Description

The purpose of the Evaporative Emission Control System is to capture the fuel vapors (HC) that would escape from the fuel system. Gasoline vapors from the fuel tank and throttle body are collected in a charcoal canister. When the engine is running, the ECM can command the purge valve open which allows the fuel vapors to be pulled into the intake manifold from the canister. To test the system, the ECM will close off the Canister Close Valve and then open the Purge valve. The Purge valve is then closed, trapping a vacuum in the Evaporative Emission Control. If this vacuum decays too quickly it indicates a leak in the system and the ECM will set a code. The FTPS is used for monitoring pressure and vacuum levels in the fuel tank during the purge cycle and leak checking.

DTC Description

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

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram