Fuel System; Bosch 1.5.5 Integrated Injection/Ignition System - Fiat Bravo Service Manual

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B O S C H 1.5.5 I N T E G R A T E D I N J E C T I O N / I G N I T I O N S Y S T E M
Introduction
The BOSCH 1.5.5 system fitted on the 1242 16v ie engine belongs to the category of static advance,
digital, electronic ignition systems integrated w i t h phased, intermittent type electronic fuel injection
systems.
The integrated system can be divided into the following sub systems:
ELECTRICAL/ELECTRONIC CIRCUIT
AIR INTAKE CIRCUIT
FUEL SUPPLY CIRCUIT
EMISSION CONTROL DEVICES
The system is capable of detecting the following parameters by means of appropriate sensors:
- the engine rotation speed;
- the correct sequence of T D C in the explosion stroke for the cylinders (injection timing);
- the absolute pressure in the inlet manifold;
- the intake air temperature;
- the position and the variation speed of the accelerator butterfly;
- the temperature of the engine coolant;
- the possible presence of detonation;
- the speed of the vehicle;
- the battery voltage;
- the possible engagement of the air conditioning;
- the possible end of travel of the power assisted steering.
This information, usually in analogue format, is converted into digital signals by analogue/digital ( A / D )
converters so that they can be used by the control unit.
The management programme (software) is stored in the control unit memory and consists of a series of
strategies, each of w h i c h manages a precisely defined system control function.
Through the use of the information (input) listed earlier, each strategy processes a series of parameters
using data maps stored in special areas of the control unit memory and then operates the system actua-
tors (output), w h i c h consist of devices w h i c h allow the engine to operate, such as:
- injectors;
- ignition coil;
- relay feeds;
- implementation solenoid valves;
- interface with the vehicle (diagnostic warning light, diagnostic instrument, etc.).
NOTE The BOSCH 1.5.5 injection/ignition
justing type.
NOTE In the drawings and diagrams, the numbers indicate the corresponding engine control unit pins
(number/A for connector A, number/B for connector B).
Copyright by Fiat Auto
16v
system does not require any adjustment as it is the se/f-ad-
E n g i n e

Fuel system

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