Pajero II Workshop Manual 1991 · FUEL · страница 220 из 339 · Открыть оригинал PDF ↗
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FUEL PUMP INSPECTION
Refer to P.13-15.
ENGINE CONTROL RELAY INSPECTION
Refer to P.13-100_
Датчик массового расхода воздуха
OPERATION
The air-flow sensor is incorporated within the
cleaner; it functions to convert the amount of
engineairintaketo pulse signalsoffre
quency proportional to the amount of engine
air intake,andto inputthose signalstothe
engine control unit.
Theenginecontrolunit then,basedupon
those signals, calculatesthe amount of fuel
injection, etc
The power for the air flow sensor is supplied
fromthe control relay to the air flow sensor,
andisearthedattheenginecontrolunit.
The air flow sensor, by intermitting the flow
ofthe5Vvoltage applied fromthe engine
control unit produces pulse signals_
Hint 1
If the engine sometimes stalls, try starting the engine
andshaking the air flow sensor harness.
If the engine then stalls, incorrect or improper contact
of the air flow sensor connector is the probable cause
Hint 2:
If, when the ignition switch is switched ON (but the
enginenot started),theairflowsensor output
frequency is any value other than zero, a malfunction
of the air flow sensor or of the engine control unit is
the probable cause
Hint 3:
If idling is possible even though the air flow sensor
output frequency is deviated from the standard value,
the cause is usually a malfunction other than of the air
flow sensor
[Examples]
(1)Theflowofairwithintheairflowsensoris
disturbed. (Air duct disconnection or clogged air
cleaner element )
(2) Incomplete combustionwithina cylinder:(Mal-
functionof spark plugs, ignitioncoil,injectors,
compression pressure, etc )
(3)Air is taken into the intakemanifold through
leaking gasket, etc.
(4)EGR valve
Improper adhesion of valve sheet
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