Leak Detection

The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring vacuum decay.

The fuel level sensor input to the PCM is used to determine if the fuel level in the tank is correct to run the [1][2]EVAP diagnostic tests. To ensure sufficient volume in the tank to begin the various diagnostic tests, the fuel level must be between 15% and 85%.

The PCM monitors system vacuum level via the fuel tank pressure sensor input.
^ Purge Lines
The purge lines carry the fuel vapors to the various EVAP system components.
^ Enhanced Evaporative Emission ([1][2]EVAP) Service Port
The Enhanced Evaporative Emission (EVAP) Service Port is located between the purge valve solenoid and the EVAP emission canister. The service port is identified by a green color cap. The port contains a schrader valve and fittings in order to allow the connection of the service tool kit Enhanced EVAP Pressure Purge Diagnostic Car J 41413.