1998 · FUEL [13] · страница 84 из 104 · Открыть оригинал PDF ↗
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IDLE SPEED CONTROL SERVO (STEPPER MOTOR TYPE)
Engine control unit connector
9FU0393
OPERATION
The intakeairvolumeduring idlingis
controlled by opening or closing the servo
valve provided in the air path that bypasses
the throttle valve.
The servo valve is opened or closed by
operating the stepper motor in the speed
control servo in normal or reverse direction:
The battery power is supplied to the stepper
motor through the control relay: As the engine
control unit turns on power transistors in the
unit one after another: the stepper motor coil is
energized and the motor rotates in normal or
reverse direction:
TrOUBLESHOOTING HINTS
stepper motor Or open circuit in the harness
is suspected.
Hint 2: If the idle speed control servo harness and
individual part checks have resulted normal
but the stepper motor steps are out of
specification, the following faults are
suspected
Poorly adjusted reference idle speed
Deposit on the throttle valve
Air leaking into the intake manifold
through gasket gap
Loose EGR valve seat
Poor combustion in the cylinder (faulty
ignition plug, ignition coil, injector, low
compression pressure, etc )
Hint 1: If the stepper motorstepincreases to 100
to 120 steps or decreases to 0 step, faulty
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