Pajero II Workshop Manual 1991 · FUEL · страница 122 из 339 · Открыть оригинал PDF ↗

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Датчик массового расхода воздуха

OPERATION

The air flow sensor located inthe aircleaner
converts the engine intakeairvolumeinto
pulse signal of frequency proportional to the air
volume and inputs it to the engine control unit,
which then computes the fuel injection rate, etc
based on the input signal.

The air flow sensor power is suppliedfromthe
control relay to the air flow sensor and is earthed
in the engine control unitThe air flow sensor
generatesa pulse signal as it repeatedly opens
and closes between thevoltage supplied
from the engine control unit and earth:

TROUBLESHOOTING HINTS

Hint 1: If the engine stalls occasionally,crank the
engine and shake the airflowsensor harness.
If the engine stalls,poor contact of the air
flow sensor connector is suspected,
Hint 2: If the air flow sensoroutput frequency is

otherthanwhenthe ignitionswitchis
turned on (but not starting the engine). faulty
airflowsensororenginecontrolunit is
suspected.
Hint 3: If the engine can be run idle even though the
air flow sensoroutput frequencyis out of
specification,troublesareoftenfoundin
other than the air flow sensor itself.
Examples]

(1) Disturbed air flow in the air flow sensor
(Disconnected air duct, clogged air cleaner
element)

(2) Poor combustion in the cvlinder
(Faulty ignition plug: ignition coil, injector,
incorrect compression pressure, etc

(3) Air leakingintothe intakemanifold
through gap of gasket; etc

(4) Loose EGR valve seat

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