
crankshaft position pulses are fed to the ECU when the engine is
not running. To re-activate the fuel pump, switch off the ignition
for ten seconds, then switch it on again.
After the fuel pump is shut off, the fuel pressure can slightly
go down and then stabilizes; or it can go up, if the engine is warm.
When the fuel pressure fails to stabilize and instead, goes down,
operate the fuel pump and immediately after its stop, pinch the
hose that supplies fuel to the central injection unit.
If no pressure drop is evident, check the fuel line for leaks
between the fuel tank and central injection unit, check the gauze
filter for tightness, then re-check pressure in the fuel delivery sys-
tem.
A lower pressure (below 190 kPa) can be caused by a faulty
fuel pressure regulator or by a restricted flow in the fuel delivery
system.
The fuel delivery system capacity can be checked by return
flow. When necessary, renew the gauze filter.
The fuel pressure regulator can be checked by a pressure
gauge; for that disconnect the return hose and immerse it into a
container. Operate the electric fuel pump, pinch the return hose
and check the pump pressure by the pressure gauge. Release the
hose. The pressure gauge reading is the pressure of the fuel pres-
sure regulator valve actuation. Renew the fuel pressure regulator
when applicable.
A higher pressure in the fuel supply system (in excess of 210
kPa) can be caused by a faulty fuel pressure regulator or a high-
er resistance to fuel return to the fuel tank. To check this, connect
a pressure gauge to the system; then working in the engine bay,
disconnect the return hose and immerse it to the container.
Switch off the electric fuel pump and read the pressure gauge to
check the pressure.
Should the pressure exceeds the normal value, renew the
fuel pressure regulator, otherwise, identify and eliminate the
cause of higher resistance to fuel return.
Electric fuel pump
Removal and refitting.
Disconnect the wiring and depres-
surize the fuel delivery system as described in the procedure for
removing the central injection unit.
Disconnect the fuel pipes from the fuel pump and undo the
nuts holding it to the fuel tank. Withdraw the fuel pump unit from
the fuel tank.
Refitting is a reversal of the removal procedure.
The electric pump cannot be dismantled or repaired. In case
of failure, always replace it with a new one.
Evaporative emission control system
Examine the hoses and charcoal canister. If the housing is
found cracked or damaged, renew the charcoal canister.
If leakage is evident, check the hose connections for tight-
ness. Renew a leaking canister.
Electrical equipment
Refer to Fig.9-5 for electric wiring diagram that is comple-
mented with the injection wiring harness routed between the
injection electronic control unit (ECU) and various sensors and
injection system actuators.
Through a separate connector, three wires of the injection
wiring harness are linked to the low tension (LT) input of the
tachometer in the instrument cluster, to the «CHECK ENGINE»
lamp and terminal «15» of the ignition switch.
There are five fuses in the injection wiring harness.
Fuse 16 (50 amperes) is housed separately. It protects the
intake manifold preheater. The remaining four fuses (15 amperes
each) are located in a separate fusebox 17, on the left-hand side,
under the facia console.
Refer to Table 9-1 for detailed information on the circuits
fused.
Table 9-1
Injection system protective fuses
Fuse
Circuits protected
1-2
Fuel pump «on» relay (contacts)
Electric fuel pump. Fuel injector.
3-4
Oxygen sensor. Vehicle speed sender.
Canister valve.
Intake manifold preheater relay (winding).
5-6
ECU. Ignition control module.
7-8
Reserve
In addition to fuses, there is «a fusible link» at the end of the
red wire connected to the battery. This fusible link represents a
length of black wire of 1mm
2
cross-section, whereas the main red
wire is of 6 mm
2
cross-section.
188
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