Mazda 2006 MX-5 - Variable Intake Air System Operation [Lf]; Operation Conditions; Except for Operation Conditions; Closed

INTAKE-AIR SYSTEM
01–13–6
VARIABLE INTAKE AIR SYSTEM STRUCTURE [LF]
E5U011300020N03
• Mainly consists of the variable intake air solenoid valve, variable intake air shutter valve, variable intake air
shutter valve actuator and vacuum chamber.
End Of Sie
VARIABLE INTAKE AIR SYSTEM OPERATION [LF]
E5U011300020N04
Operation Conditions
• If any of the following conditions are met:
— Engine speed is approx. 4,750 rpm or more.
— Engine speed is approx. 3,150 rpm or less and the throttle opening angle is the specified value or more.
(heavy load condition)
Except for Operation Conditions. (Variable Intake Air Shutter Valve Is Closed)
• Intake manifold vacuum is applied to the variable intake air shutter valve actuator by the operation of the
variable intake air solenoid valve, closing the variable intake air shutter valve.
• Under this condition, the effective intake manifold
length is from the intake valve to the dynamic
chamber (A—C). An inertia charging effect is
obtained due to this elongated intake manifold
length, air intake volume increases, and higher
torque is obtained at low to medium engine
speeds.
VARIABLE INTAKE AIR
SOLENOID VALVE
: TO PCM
CHECK VALVE
VACUUM CHAMBER
DYNAMIC
CHAMBER
VARIABLE
INTAKE AIR
SHUTTER VALVE
VARIABLE INTAKE AIR
SHUTTER VALVE ACTUATOR
E5U113ZS5003
VARIABLE
INTAKE AIR
SHUTTER
VALVE
CLOSED
DYNAMIC
CHAMBER
C
A
E5U113ZS5004