Technical data

F
NO
-i
NO
During a starting, check +12-V on fuel
pump terminals.
t--
Check G4 Fuse (15 Ohm)
Lheck fuel system pressure
-
Connect a pressure gauge to fuel
circuit
- Try a prolonged starting and check
pressure presence between 2.8
bars and 3.2 bars.
NOTE:
The pump must turn for a few seFonds
even with the only key in the “MAR-
CIA”’ running position.
c
YES
Check that negative terminal of pump is
at ground.
?.
Check fuel filter and any possible duct
/ throttlings.,
i
YES
L
Check efficiency of pressure gauge.
YES
c
YES
Check that relay S1.2.a is energized.
r
(
.
1
:heck electrical circuits consisting of:
terminal 30 of relay S12.b and
ground = 12 V
terminal 85 of relay S12.b and
ground = 12 V
terminal 86 of relay S12.b and
ground = 12 V
terminal 87 of relay S12.b and
ground=12V
l
c
NO
c
YES
Check circuit downstream from relay
S12a up to fuel pump, beginning from
terminal 87 of the same r,elay.
Check that fuel pump rotates.
I
I
YES
Probable failure on electronic CU.
I
Search for fauhin vehicle wiiing.
Go on with diagnosis.
s-1 of CU connecter.
Eliminate ground connections on pin 12
r
TEST No. 1