System Description

The Evaporative Emission (EVAP) system includes the following components:

• Fuel tank
• EVAP vent solenoid.
• Fuel tank pressure sensor.
• Fuel pipes and hoses.
• Fuel vapor lines.
• Fuel cap
• EVAP canister.
• Purge lines.
• EVAP emission canister purge valve.
• EVAP service port.

The EVAP purge canister solenoid is controlled by the Engine Control Module (ECM). The ECM applies a ground to the EVAP purge canister solenoid. The ECM determines when to activate the EVAP canister purge solenoid depending on operating conditions, including Throttle Position (TP), engine speed, Engine Coolant Temperature (ECT) and ambient temperature.

The Diagnostic Trouble Code will detect an open or short circuit.