Evaporative Emission Control System; Charcoal Canister; Description - Mazda MX-5 1990 Workshop Manual

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F
EVAPORATIVE EMISSION CONTROL SYSTEM
EVAPORATIVE EMISSION CONTROL SYSTEM
DESCRIPTION
The evaporative emission control system consists of the fuel vapor valve, the two-way check valve, the char-
coal canister, the solenoid valve (purge control), the engine control unit, and the input devices. The amount
of evaporative fumes introduced into the engine and burned is controlled by the solenoid valve in relation
to the engine's operating conditions. To maintain the best engine performance, the solenoid valve is con-
trolled by the engine control unit.
THROTTLE SENSOR
(IDLE TERMINAL)
8&-------,
OXYGEN SENSOR
ATMOSPHERIC
PRESSURE
SENSOR
~
WATER THERMOSENSOR
ENGINE
..------.1
CONTROL
,-
NEUTRAL/CLUTCH SWITCH
~:r-------'
AIRFLOW METER
~------'
CRANK ANGLE SENSOR
(NE-SIGNAL)
i;J
Operation
UNIT
TWO-WAY
CHECK VALVE
I-
~1
z
:J
0
::s
:2
«
rn
«
(!J
ill
(!J
.....I
a:
- I
:J
«
n..
~J
CHARCOAL
CANISTER
-
LOW
DUTY
HIGH
SOLENOID VALVE
(PURGE CONTROL)
05UOr:X-182
The solenoid valve (purge control) is controlled by duty signals from the engine control unit to perform purg-
ing of the charcoal canister. Purging is done when these conditions are met:
(1) After warm-up.
(2) Driving in gear.
(3) Accelerator pedal depressed (idle switch OFF).
(4) Oxygen sensor functioning normally.
F-118
-.

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