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CHECKING THE DEVICE
FOR OPEN ING THE
BUTTERFLY
1.
Electrical components
With the engine at
it//ing
spteå.
disconnect
one
of
the leeds
to the
«
PIERBURG
»
electro-valve(1).
the engine speed must
increase.
If
not.
using u
test lamp, check the
following
- that,
under deceleration
and
for any engine
speed Nd
1800
±
100 rpm the
« PIERBURG »
electro-valve
(1
)
is not energized.
- that,
under acceleration
and for any engine
speed from
idling
speed to
the
speed
Nc Nd
-4-
50
to
250
rpm. the
«
PIERBURG
»
electro-valve is energized.
If in this
case the electro-valve
is
not energized.
ensure
(
using a test lamp
)
that the
winding in
relay
(2)
is not
energized
for
an engine
speed
below
"
Nd
TT
(
under
deceleration
)
or
an engine
speed below
Nc
TT
(
under acceleration
).
Accelerate
the
engine up to engine speed
Nc
- the winding in relay
(2)
must be energized.
If
not!
replace the electronic unit
(3)
after
having
checked
the connections.
2.
Pneumatic
components
Ensure
that the vacuum
reaches
capsule
(4)
(device
for opening butterfly
)
when the engine speed is
equal or above
Nc
Make
sure the vacuum existe at the carburettor
outlet. If it
does, and yet
does
not reoch cap-
sule (4)1
device
for opening butterfly
).
check
the
circuit
dong all
its
length. pluggin.g it first
leve' with the 3-way union. on
the air-supply
valve side.
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