Evaporative Emission Control System Description - Mazda 121 Workshop Manual

F
EVAPORATIVE E]IIISSION CONTROL SYSTEi'
EVAPORATIVE EM]SSION CONTROL SYSTEM
DESCRIPTION
INHIBITOH SWITCH (ATX)
THFoTTLE SENSoF
)\M
\ l h -
s!q.t
OXYGEN SENSOB
WATEF TH€RMOSE
q_l
rnrrori sersoa
CANISTEF
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CHECK VALVE
FIJEL VAPOFI VALVE
The evaporative emission control system consists of the fuel vapor valve' the-ch€ck valve (two'way)' the
chircoai canister, the solenoid valva (purge control), the engine control unit (ECU)' and the input devices'
The evaporative lumes drawn into the engine and burned is controlled by purge control solenoid valve The
ibU a.G"is fne enqine's operating coniitions by the various input devices and controlsthe solenoid valve
operation by electrical signals according to these values.
Operation
ilie solenoid valve lpurge control) is controlled by signals from the ECU to periorm purging of the charcoal
canister. Purging is done when these conditions are met:
(1) After warm-up
(2) Driving in gear
(3) Accelerator pedal depressed
(4) Oxygen sensor functioning normally
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