Purge Solenoid Valve Construction/Operation; Catch Tank Function - Mazda RX-8 2004 Service Highlights

PURGE SOLENOID VALVE CONSTRUCTION/OPERATION

• Installed to the catch tank integrated with the extension manifold (upper).
• Mainly consists of a solenoid coil, spring, and a plunger.
• Opens and closes the solenoid valve path according to purge solenoid valve control signals (duty signals) from
the PCM in order to adjust the amount of evaporative gas sent to the extension manifold (upper) in accordance
with engine conditions.
• When the PCM signal is given to the solenoid coil, it energizes and becomes an electromagnet, pulling in the
plunger. This opens a path between ports, and evaporative gas is drawn into the intake-air system by intake
manifold negative pressure.
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CATCH TANK FUNCTION

• The catch tank stores liquefied evaporative gas in order to prevent an overly rich air-fuel ratio caused by the
introduction of this gas in the intake-air system.
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EMISSION SYSTEM
FROM CHARCOAL
CANISTER
SOLENOID
COIL
PLUNGER
SPRING
: FLOW OF EVAPORATIVE GAS
PURGE SOLENOID VALVE
DUTY SIGNAL
TO EXTENSION
MANIFOLD (UPPER)
PCM
2P
CHU011618740S04
01–16
CHU0116S012
CHU0116S013
CHU011613978S01
01–16–9