Charcoal Canister Purging Control (EVAP)

The fuel vapors stored in the charcoal canister are purged at temperatures above 70 °C (158 °F) via the purge switch-over valves (Y58/2 and Y58/3). The vapors then get burned in the combustion process. In order to control the purge quantity, the LH control units activate the switch-over valves at a frequency of 7.5 Hz (cycles). The purge quantity is determined by the duration of each cycle.