Fiat 1996 Brava Service Manual page 208

Engine
Fuel system
Bravo-Brava ty
TO
10.
ELECTRIC-ELECTRONIC SYSTEM
The fuel system electric - electronic circuit comprises a wiring circuit, an electronic unit (control unit)
and the following sensors and actuators:
Rpm sensor
Coolant temperature sensor
Air flow meter (debimeter)
Intake air temperature sensor
Injector with controls
Accelerator lever position sensor
Fast idle control solenoid
Preheating control unit
Electronic control unit
The electronic control unit (ECU) is located
beneath the glove compartment (right hand
side) and is connected to the wiring by a 25
pin connector. This receives all the data on
engine service conditions transmitted by the
various sensors in addition to atmospheric
pressure information obtained by a sensor lo­
cated inside the control unit. The control unit
uses this data in conjunction with specific
programs to implement the following operat­
ing strategies:
- injection advance control
- fast idle control
- exhaust gas recirculation
- glow plug pre/post heating control
- air conditioning system control
Rpm /TDC
Accelerator
lever position _ _
Coolant
temperature
Air
temperature
Injector
with controls
ECU
lAtmospherici
i pressure ■
—
Advance
actuator
control
solenoid
INJECTION ADVANCE CONTROL
The electronic control unit uses data on en­
gine rpm/TDC, accelerator lever position, air
and coolant temperature and atmospheric
pressure to calculate the optimal injection
advance. It compares this with the actual val­
ue transmitted by the injector with controls
and adjusts the advance actuator control
solenoid when required.
8
Publication no. 506.670/06