Fiat 1996 Brava Service Manual page 456

Bravo-Brava © i 16v
'98 range
Engine
Fuel system
10.
FUEL INJECTORS ( I W P 064)
The fuel injectors are of the double jet "top-feed" type (with spray angled in relation to the injector axis).
They are specific to engines with 4 valves per cylinder, and enable the jets to be directed towards the
two inlet valves.
The jets of fuel at a differential pressure of 3 bar emerge from the injector, are instantly atomized and
form two propagation cones.
The control logic of the injectors is of the "phased sequential type"; in other words the four injectors are
driven in accordance with the intake sequence of the engine's cylinders, while delivery may start for
each cylinder at the expansion stage up until the intake stage already started.
The injectors are fixed by the fuel manifold, which presses them into their seatings in the inlet pipes.
They are also anchored to the fuel manifold by means of "safety stops". Two Viton rubber rings (1) and
(2) ensure the seal on the inlet pipe and fuel pipe.
The fuel is supplied from the top (3) of the injector, whose body contains the winding (4) connected to
the terminals (5) of the wiring connector (6).
NOTE During removal and refitting, do not apply stresses exceeding 120 N on the connector (6) of the injector
in order not to impair its operation,
m \t\
\\v
///// \\\\\
///// m\\
Wiring connector Check the resistance
+12V©
I
• * >
1 2 3 4
7 1 7 9 7 8 7 2
P4A44IJ02
NOTE The numbers in boxes indicate the cor­
responding control unit pins positioned
in the order of cylinder numbers.
The injector's resistance can be measured by
disconnecting the connector and connecting
an ohmmeter as shown in the figure.
Resistance: 13.7 -15.2 ohm at 20 °C
44 Publication no. 506.670/14