Vibe FWD L4-1.8L VIN L (2005)
Canister Purge Solenoid: Description and Operation
EVAP CANISTER PURGE SOLENOID VALVE
The EVAP canister purge valve controls the flow of fuel vapors from the EVAP system to the intake manifold. The purge solenoid valve is low side
controlled by the PCM, using a pulse width modulated (PWM) or duty cycle circuit. The purge solenoid valve is also opened during some portions of the
EVAP system testing.
EVAP Vacuum Leak Pump Assembly
The EVAP vacuum leak pump assembly contains the fuel tank pressure (FTP) sensor, the canister vent solenoid, and an electric motor driven vacuum
pump. The vacuum pump provides pressure for leak testing when the engine has been OFF for approximately five hours. The pump assembly also has
several internal filters and a 0.5 mm (0.020 inch) reference orifice. The reference orifice provides controlled movement of the pressure within the
system, enabling the FTP sensor to accurately monitor system performance. The complete pump assembly is mounted on the EVAP canister, eliminating
the need for additional hoses or lines for connections.
