Pajero II Technical Information Manual 1991 · PYJE9002 PAJERO 91 TIM 1 · страница 28 из 71 · Открыть оригинал PDF ↗
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ACTUATOR
IDLE SPEED CONTROL (ISC) SERVO
The ISC servo consists of a DC motor, spur gears
and a servo valve, and is joined to the throttle body.
The spur gear on the lead screw of the servo valve
shaft turnswhenthe DCmotor is driven by the
current from the engine control unit: Consequently
the valve extends or retractsaccording to the motor
rotating direction.
The volume of bypass air that flows bypassing the
throttlevalve increaseswhentheclearancebe-
tween the servo valve and the throttle body seat
becomes larger and it decreases when this clear-
ance becomesmaller.
In other words, the bypass air volume changes with
the servo valve position (i.e.the gap between the
valve anditsseat) . The servo valve position changes
eitherpositivelyornegatively accordingtothe
direction of the DC motor's rotation and the amout
of valve's positional change is continuously calcu-
lated by the enginecontrolunit.
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