Mazda RX-8 2004 - Secondary Air Injection (Air) Pump Function; Secondary Air Injection (Air) Solenoid Valve Construction;Operation; Secondary Air Injection (Air) Solenoid Valve Function

EMISSION SYSTEM
01–16–5
01–16
• 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
CHU011618740S01
• 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
CHU011618740S02
• 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.
End Of Sie
SECONDARY AIR INJECTION (AIR) PUMP FUNCTION
CHU011613811S01
• 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
Condition
When energized
When not energized
Vacuum chamber (A)
Actuator (B)
Atmosphere (C)
: Airflow
WHEN ENERIZED
WHEN NOT ENERGIZED
A
B
CA
B
C
COIL
PLUNGER
: FLOW OF INTAKE MANIFOLD NEGATIVE PRESSURE
COIL
SPRING
PLUNGER
CHU0116S009
PCM
1O
AIR SOLENOID
VALVE
CHU0116S010