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• When the AIR solenoid valve is turned off, atmospheric air forms in the actuator and the valve is closed by
spring force, thereby blocking the path.
• The reed valve provided in the AIR control valve prevents reverse flow of exhaust gas and protects the AIR
pump.
End Of Sie
SECONDARY AIR INJECTION (AIR) SOLENOID VALVE FUNCTION
• Switches the path of intake manifold negative pressure between the vacuum chamber and the AIR control
valve.
End Of Sie
SECONDARY AIR INJECTION (AIR) SOLENOID VALVE CONSTRUCTION/OPERATION
• Mainly consists of a coil, spring, plunger, and filter.
When Energized
• The solenoid coil becomes an electromagnet and pulls in the plunger. This opens an airflow path between
ports A and B, applying intake manifold negative pressure to the actuator of the AIR control valve.
When Not Energized
• The path of intake manifold negative pressure is closed, and the path between B and C is opened, causing
the actuator of the AIR control valve to be open to the atmosphere.
Condition
When energized
When not energized
WHEN ENERIZED
B
COIL
A
PLUNGER
: FLOW OF INTAKE MANIFOLD NEGATIVE PRESSURE
End Of Sie
SECONDARY AIR INJECTION (AIR) PUMP FUNCTION
• Pressurizes outside air and discharges secondary air.
• Secondary air from the AIR pump is pumped to the exhaust ports through the AIR control valve.
End Of Sie
EMISSION SYSTEM
Vacuum chamber (A)
C
AIR SOLENOID
VALVE
1O
Actuator (B)
WHEN NOT ENERGIZED
B
COIL
A
SPRING
PLUNGER
PCM
CHU011618740S01
01–16
CHU011618740S02
: Airflow
Atmosphere (C)
C
CHU0116S009
CHU0116S010
CHU011613811S01
01–16–5
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