Evaporative Emission Control Canister: Description and Operation

EVAP CANISTER AND LEAK DETECTION PUMP

Fig. 1 EVAP Canister And Leak Detection Pump:

All vehicles use a sealed, maintenance free, charcoal filled EVAP canister. The canister mounts to the radiator support behind the front fascia.

Fuel tank pressure vents into the canister. The canister temporarily holds the fuel vapors until intake manifold vacuum draws them into the induction system. The PCM regulates vapor flow by switching the EVAP purge solenoid ON and OFF. The EVAP purge solenoid supplies the vacuum signal to the EVAP canister. The PCM purges the canister at predetermined intervals and engine conditions.