Fiat 1995 Brava, Service Manual

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Engine
Fuel system
Bravo-Brava
10
16v
10.
ELECTRICAL/ELECTRONIC CIRCUIT
This circuit electrically connects all the components of the system and is made up of the following com-
ponents:
wiring with fuses;
HITACHI engine control unit;
system and pump relay;
sensors:
butterfly position sensor,
coolant temperature sensor,
air flow meter,
engine rpm sensor,
engine timing sensor.
Lambda sensor,
vehicle speed sensor,
detonation sensor;
- actuators:
electric fuel pump,
injectors,
engine idle speed adjustment solenoid valve,
charcoal filter solenoid valve,
electric pump cut out inertia switch,
ignition power module,
ignition coils;
- devices connected to the cotnrol unit:
radiator fan relays,
climate control compressor relay (if fitted),
Fiat C O D E control unit.
Layout of system earth points
In order to increase the electro-magnetic compatibility and the operational reliability special care has
been taken over the layout of the earth points, as shown in the diagram below:
1. control unit casing, connected to the vehicle bodyshell;
2. secondary coils connected under the cylinder head cover;
3. control unit internal earths (pins 6, 12, 107, 108, 116, 40, 48), Lambda sensor heater earth, relay
earths, ignition power module earth connected to the engine cylinder block/crankcase.
P4A20BJ01
2 0
Print no. 506.670