Fiat Bravo Service Manual page 171

Engine Tipo C @< *,
Fuel system
10.
COMPONENTS OF INJECTION-IGNITION SYSTEM
The injection-ignition system consists mainly of wiring, an electronic control unit (ECU) and the fol­
lowing sensors and actuators:
Sensors Actuators
-Rpm and TDC sensor
-Timing sensor
-Throttle position sensor
-Coolant temperature sensor
-Intake air temperature sensor
-Absolute pressure sensor
-Vehicle speed sensor
-Lambda probe
INJECTION-IGNITION SYSTEM WIRING
The various system components are connected by a single wiring system fitted with connectors of vari­
ous types. These are grouped in special ducts fitted to the engine (prewiring).
INJECTION-IGNITION ECU
The I.A.W. -1AF.13 (I.A.W. -1AF.23 for vehicles with automatic transmission) injection-ignition system
ECU adopted is specific to this version.
It consists of hybrid thick film circuits connected to the electrical system by a 55 pin multiple connector.
The ECU'S task is to process signals from the various sensors through the application of software algo­
rithms and control the actuators in order to achieve optimal engine performance.
Essential features of the electronic control unit are as follows:
a. Data acquisition and coding section
This consists of a set of electronic components designed to receive data in the form of analogue elec­
trical signals. Inside, the signals are converted into digital signals, processed and stored.
-Engine idle speed actuator
-Electric fuel pump
-Fuel vapour cut-off valve
-Injectors
-Ignition coils
-Dual relay
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Publication no. 506.670