Fuel Evaporative Emission Control (Evap) System - Toyota MR2 1988 Repair Manual

EC-6 EMISSION CONTROL SYSTEMS - Fuel Evaporative Emission Control (EVAP) System
FUEL EVAPORATIVE EMISSION CONTROL (EVAP) SYSTEM
Check Valve
BVSV Purge Port
Fuel Tank
EC1461
To reduce HC emissions, evaporated fuel from the fuel tank is routed through the charcoal canister to the intake
manifold for combustion in the cylinders.
Coolant Temp.
Below
35°C (95°F)
Above
54°C (1 29°F)
High pressure
in tank
High vacuum
in tank
Throttle Valve
BVSV
Opening
CLOSED
-
Positioned below
OPEN
purge port
Positioned above
purge port
-
-
-
-
EC1462
Check Valve
(Vacuum Valve)
EC3070
Canister Check Valve Check
Valve in
Evaporated Fuel (HC)
(1) (2)
(3)
Cap
-
-
- -
HC from tank is absorbed
into the canister.
CLOSED
-
-
-
HC from canister is led into
OPEN
- - -
air intake manifold.
OPEN CLOSED CLOSED
HC from tank is absorbed
-
into the canister.
-
CLOSED
OPEN OPEN Air is led into the fuel tank.
INSPECTION OF FUEL VAPOR LINES,
FUEL TANK AND TANK CAP
1. VISUALLY INSPECT LINES AND CONNECTIONS
Look for loose connections, kinks or damage.
2. VISUALLY INSPECT FUEL TANK
Look for deformation, cracks or fuel leakage.
3. VISUALLY INSPECT FUEL TANK CAP
Look for a damaged or deformed gasket and cap.
If necessary, repair or replace the cap.