MANUALS · FUEL [13] · страница 122 из 340 · Открыть оригинал PDF ↗

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OPERATION

The air flow sensor locatedin the aircleaner
convertsthe engineintakeair volumeinto
pulse signal of frequency proportional to the air
volume and inputs it t0 the engine control unit;
which then computes the fuel injection rate, etc.
based on the input signal.

The air flow sensor power is supplied from the
control relay to the air flow sensor and is earthed
in the engine control unit:The airflowsensor
generatespulse signal as it repeatedly opens
andcloses 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 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 thanwhen the ignitionswitchis
turned on (but not starting the engine). faulty
airflowsensorOrenginecontrolunit
suspected.

Hint 3: If the engine can be run idle even though the
air flow sensor output frequency is 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)Poorcombustion in the cylinder
(Faultv ignition plug; ignition coil, injector,
incorrect compression pressure, etc )

(3) Air leaking intothe intake manifold
through gap of gasket etc

(4) Loose EGR valve seat

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