Evaporative Emission Control (Eec) System; Component Descriptions - Mazda 626 MX-6 Workshop Manual

EVAPORATIVE EMISSION CONTROL (EEC) SYSTEM

This system stores fuel vapor generated in the fuel tank in the canister when the engine is not running.
The fuel vapor is stored in the canister until it is drawn into the dynamic chamber and burned when
the engine is started.

COMPONENT DESCRIPTIONS

Component
Air flow meter Detects amount of intake air;
sends signal to control unit
Charcoal canister Stores gas tank fumes when engine
stopped
Check and cut valve Releases excessive pressure or vacuum
in fuel tank to atmosphere
Engine control unit Detects signals from input sensors and
switches; controls solenoid valve (Purge
control)
Ignition coil (-) Detects engine speed; sends signal to
control unit
terminal
Separator Prevents fuel from flowing into charcoal
canister
Solenoid valve Controls vacuum line to vacuum switch
(Purge control) valve
Three-way check Controls pressure in fuel tank
valve
Vacuum switch valve Regulates evaporative fumes from canis­
ter to intake manifold
Water thermo sensor Detects coolant temperature;
sends signal to control unit
Water thermo valve Controls vacuum applied to No.1 purge
control valve and solenoid valve (Purge)
Function
Intake air temp sensor and
fuel pump switch are in­
tegrated
Opens vacuum line above
54°C (129°F)
4A
EEC SYSTEM
Application
New Previous
Remarks
model
O
O
0
o
o
o
o
O'
o
o
o
86U04A-137
4 A -7 3
model
0
O
X
0
o
X
0
o
0
o
0