manuale per l'installatore - 1/3 tipologie d'installazione - 2/3 software ...

In case of wrong installation
(picture 6.8) it happens what indicated
hereunder:
• The petrol 1 injector is cut and
the gas 2 injector is piloted.
• After 3 injections the petrol 2
injector is cut, too and the gas
1 injector is piloted.
• After other 3 injections the
petrol 3 injector is cut, too and
the gas 3 injector is piloted.
• Again After other 3 injections
the petrol 4 injector is cut, too
and the gas 4 injector is piloted.
This means that during the first
phase the cylinder 1 is not fed
while the cylinder 2 receives both
petrol and gas.
To easily find possible error in
the injectors electric connection
there is a program screen called
“Actuators test” (picture 6.10) and
you can find it in Diagnostic
Actuators Test.
When entering this screen the
program reads on the ECU how
many injectors are connected to
the ECU itself (4 in the example)
and what is the delay for the injections
number between the changeover
in a cylinder and the one in
the next one (3 in the example).
By taking the tick marks away
from the injectors it is possible to
make the cylinders immediately
fed with petrol even if the
changeover switch is turned to gas
position and the led is green: then
you can decide (in case of 4 cylinders)
to make the engine work
with 3 cylinders with gas and 1
with petrol, or 2 with gas and 2
with petrol, or 1 with gas and 3
Fig. 6.10
with petrol or, finally, all the 4 with
petrol. Note that in this latter case
even if the vehicle correctly runs
on petrol, the changeover switch
led is green, the solenoidvalves
open (or they will open at changeover)
and this behaviour can create
confusion. Moving the sliding
bar to the right it is possible to
increase the change-over delay
between two consecutive injectors.
Procedure for the identification
of injectors connection errors:
Let’s suppose to have the same
situation described in the picture
6.9 and you want to verify if the
injectors have been correctly connected.
Increasing the change-over
delay the time during which the
vehicle has a not fed cylinder (the
first) and another one fed with both
fuels (the second) increases too
and you will easy feel the engine
“is working bad” or switch off.
At this point you know there
was a change in the connection of
the injectors but you do not know
52
what are the inverted ones.The
procedure is the following.
Procedure for the correction of
injectors connection errors:
1. Take the tick marks away
from each injectors cell. the
engine will work with petrol.
2. Add a tick in the injector 1
cell.
3. If the gas injector supply gas
in the correct cylinder (that is
the petrol 1 injector) the engine
will correctly work. In this case
repeat the point 1 with the next
injector. On the contrary, if
there are some problems, go to
the point 4.
4. The selected gas injector has
to be moved: move the connector
on another gas injector till
obtaining the engine correct
operation.
5. Repeat the point 1 with the
next injector till finding the correct
connection for all the gas
injectors.