Technical data
r
FUEL SYSTEM
~
ELECTRICALIELECTRONKI
COMPCUVENTS’
For electronic
injection
1.7
engines’
only
ELECTRONIC
CONTROL
UNIT
CHECK
OF FUNCTIONING
1. Make sure that lambda probe
is
effi-
tient
(see: Group 00
-
Electrical
Trou-
bleshooting
Procedure
-
Test No. 8).
2. Start the engine, run it to normal
running temperature and keep it at
idk?
r.p.m.
,;,
31
Connect
a suitable exhaust gas
analyzer at exhaust pipe
outlet
and
de-
tect CO percentage of gas (with
lamb-
da probe connected).
4. Disconnect depression pipe from
pressure regulator
.and
meanwhile
Iook
at exhaust gas analyzer
Sauge.
-
-
If CO percentage
rises
momentari-
\y
and then
goes
down to normal
values, this
means
that CU works
properly (When it
is
informed that
mixture is too
rich
it
Will
reduce in-
jection time).
‘If
CO percentage
rises
and stabili-
ses at high values, this
means
that
~CIJ
is
not able to correct CO
per-
6entage.
One
cari
deduct that CU
dis
faulty
(since
lambda probe is to
ibe
considered as efficient follo-
wing check effected and Step 1).
SEMQVAL
AND ASSEMBLY
ThA
electronic CU is built into the air
f!ow
sqkàor
caver.
If necessary, remove CU from air flow
sensor
and operate as follow.
~ ~
1.
!Disconnect
multipolar
connecter
Q.
i’(3279EO883301
04.21
2. Unscrew four fixing screws shown
in figure
(one
of which is under
seal
cap).
4. Remount CU operating in reverse
or-
der
‘in
respect to removal, then apply a
new seal cap (in screw
Seat).
If CU has
bee~n
replaced,
proceed to check and if
necessary,
to effect setting of CU
per-
cen’tage at exhaust (see: Calibration
and Setting).
1
Electronic control unit
2 Multipolar
connecter
3. Remove CU
0
with
seal
gasket
0.
2 Gasket
3 Air flow sensor
ACCELERATOR
THROTTLE SWITCH
REMOVAL
AND ASSEMBLY
1.
Disconnect connecter
0.
2. Unscrew two fixing screws and
re-
move switch
0.
@
from throttle body
1 Connecter
2 Throttle body
3 Accelerator Throttle switch
3.
Fedmount
switch operating in rever-
se order in respect to removal; then
ef-
fect switch .setting (see: Calibration
and Setting).
October 1988