Pajero II Workshop Manual 1998 Supplement · FUEL · страница 35 из 104 · Открыть оригинал PDF ↗

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OPERATION

The air flow sensor located in the air cleaner
converts the engine intake air volume into
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 issupplied from the
control relay to the air flow sensor and is
earthed in the engine control unit: The air flow
as
sensor generatespulsesignal
repeatedly opens and closes between the 5 V
voltage supplied from the engine control unit
and earth.

TROUBLESHOOTING HINTS

Hint 1: If the engine stalls occasionally; crank the
engine andshake the air flow sensor
harness. If the engine stalls, poor contact of
the air flow sensor connector is suspected

Hint 2: If the air flow sensor output frequency is

other than0 when the ignition switch is
turned on (but not starting the engine)
faulty air flow sensor or engine control unit
is suspected:.

Hint 3: If the engine can be run idle even though
the air flow sensor output frequency is out
of specification , troubles are often found in
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 cylinder

(Faulty ignition plug, ignition coil
injector,incorrectcompression
pressure, etc )

(3) Air leaking into the intake manifold
through gap of gasket; etc:

(4)Loose EGR valve seat.

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