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Design and
function
Fuel system
I.H2.4
-
240
Air mass meter
Measures engine
inlake air
mass.
Those
factors
which
affect
air
density
,
such
as
temp
rature,
humid·
ity
and ptessute
(altitude)
elc.
are
laken
inlo
consId
eration
during
measurement
.
The
measurement
sensor
insi
de
Ihe
air
mass meter
consists
of
a
wire which
Is
maintained at 12.0"C
(2.S0D
F) (previously
IOO"C
-(215'F
)
higher
tllan
tile
ambient air
entering
the
engine.
As the
air mass
passing
over the
wire
increases.
more
currenl
is
required
to
maintain the
correct
temperature.
The
amount
of
current
required Is
used
to
catculate
the
air
mass
taken
In.
When
the engine
is
turned
oN,
any
dirt on
the
wire
is
burned
oN
electrically
by
heating
the
wire
to
over
1000'
C
(tBOO'
F). Any
dirt
remaining
on the
wire
would
cause it
to
send
incorrect
information
to the
control
unit and result In an
Incorrect
fueUair mixture.
Protect ive
grille
Earlier
models
of
the air
mass meter
were
provided
wi1h
an
adjustment screw
for CO
seNings. However.
because the
LH2..4
Lambda-sand is
self-adjusting
this
screw
is no
longer
necessary.
o
Coolant temperature sensor
Provides
the control
unit with information regarding
the
engine
temperature
necessary
for
proper
adjust
ment
of
injection
duration.
11
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