Pajero II Workshop Manual 1991 · FUEL · страница 169 из 339 · Открыть оригинал PDF ↗

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IDLE SPEED CONTROL SERVO (STEPPER MOTOR TYPE)

OPERATION

The intake air volume during idling is 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 bV operating
the stepper motor in the speed control servo in
normal or reverse direction;

The battery power is suppliedtothe stepper
motor through the control relay: As the engine
control unit turns on power transistors in the unit
oneafteranother,thesteppermotorcoil
energizedandthemotorrotates innormalor
reverse direction:

TROUBLESHOOTING HINTS

stepper motor or open circuit in the harness
suspected.

Hint 2: If the idle speed control servo harness and
individual part checks have resulted normal
butthesteppermotorstepsareoutof
specificationthe following faultsaresuS-
pected.

(1) Poorly adjusted reference idlespeed

(2) Deposit on the throttle valve

(3) Air leaking into the intake manifold through
gasket gap

(4) Loose EGR valve seat

5) Poorcombustion inthe cylinder (faulty
ignition plug,ignition coil, injector,low
compression pressure, etc )

HintIf the stepper motor step increases to 100 to
120 stepsordecreasestostep, faulty

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