Evaporative Emission Controls: Notes
The evaporative controls are designed to minimize the amount of fuel vapor escaping to the atmosphere. The system consists of a charcoal canister, A canister for the temporary storage of fuel vapor until the fuel vapor can be purged from the canister into the engine and burned, a vapor purge control system canister purging is accomplished by drawing fresh air through the canister and into a port on the throttle body.
The purging vacuum is controlled by the purge control diaphragm valve and the purge cut-off solenoid valve and a fuel tank vapor control system. When fuel vapor pressure in the fuel tank is higher than the set value of the two-way valve, the valve opens and regulates the flow of fuel vapor to the canister. See Fig 1 . For troubleshooting of the EEC, see Figure -Figure .