Evaporative Emission (Evap) Control System Outline [Lf]; Features; Evaporative Emission (Evap) Control System Operation - Mazda 2006 MX-5 Service Highlights

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM OUTLINE [LF]

Features

• With the adoption of the charcoal canister, release of evaporative gas into the atmosphere has been prevented.
• A duty solenoid valve (purge control valve) has been adopted for optimum control according to engine
operation conditions.
• For control of evaporative purge, refer to CONTROL SYSTEM, EVAPORATIVE PURGE CONTROL. (See 01–
40–28 EVAPORATIVE PURGE CONTROL OUTLINE [LF], 01–40–29 EVAPORATIVE PURGE CONTROL
BLOCK DIAGRAM [LF], 01–40–29 EVAPORATIVE PURGE CONTROL OPERATION [LF].)
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EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM STRUCTURE [LF]
• Consists of a purge solenoid valve, charcoal canister, rollover valve, fuel shut-off valve, EVAP system leak
detection pump, fuel-filler cap, air filter and evaporative chamber.
System diagram
FUEL SHUT-OFF VALVE
FUEL-FILLER CAP
TWC
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EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM OPERATION [LF]
• When the engine is stopped, evaporative gas in the fuel tank flows out when the pressure increases and is
absorbed by the charcoal canister.
• Evaporative gas that was absorbed by the charcoal canister passes through the solenoid valve together with
air introduced from the charcoal canister orifice when the engine is running, and is fed to the engine according
to engine operation conditions.
• If the pressure in the fuel tank decreases, air is introduced from the charcoal canister orifice through the
rollover valve. If the charcoal canister orifice is clogged, the fuel-filler cap negative pressure valve opens and
air is introduced to the fuel tank to prevent increased vacuum in the fuel tank, causing a load on the fuel tank.
• If there is a malfunction in the rollover valve, the fuel-filler cap positive pressure valve opens and evaporative
gas is released into the atmosphere to prevent increased pressure in the fuel tank, causing a load on it.
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EMISSION SYSTEM
EVAP SYSTEM LEAK
DETECTION PUMP
AIR FILTER
CHARCOAL CANISTER
ROLLOVER VALVE
EGR
VALVE
WU-TWC
EVAPORATIBE
CHAMBER
PCV VALVE
E5U011600030N01
E5U011600030N02
PURGE SOLENOID
VALVE
: TO PCM
E5U116ZS5003
E5U011600030N03
01–16–7
01–16