Diagnostic Socket; Injection/Ignition System Components; Injection/Ignition System Wiring; Injection/Ignition Electronic Control Unit - Fiat Bravo Service Manual

E n g i n e
Fuel system
10.
I N J E C T I O N / I G N I T I O N S Y S T E M C O M P O N E N T S
The injection/ignition system basically consists of wiring, an electronic control unit (I.E. control unit)
and the f o l l o w i n g sensors/actuators:
Sensors
- Speedometer sensor
- Rpm and T.D.C. sensor
- Detonation sensors
- Coolant temperature sensor
- Timing sensor
- Butterfly valve position sensor (integrated
in the butterfly casing actuator)
- Intake air temperature sensor
- Intake air temperature and flow rate sensor
(flow meter)
- Lambda sensor
- Accelerator pedal potentiometer
- Brake pedal switch
- Clutch pedal switch
I N J E C T I O N / I G N I T I O N S Y S T E M W I R I N G
The various system components are connected by t w o distinct sets of wiring.
The engine side wiring (connector M ) connect the components fitted on the engine to the injection con-
trol unit; the vehicle side wiring (connector F) connects the other components to the control unit and con-
stitutes the interface w i t h the other vehicle wiring.
The t w o connectors ( M and F) are the same and both have 64 pins, but due to the presence of special
keys it is not possible to mix up the control unit connector wiring.
I N J E C T I O N / I G N I T I O N E L E C T R O N I C C O N T R O L UNIT
The injection/ignition electronic control unit is located in the engine compartment, fixed to a bracket to
the side of the inlet manifold.
The control unit processes the signals coming from the various sensors through the application of soft-
ware algorhythms and operates the actuators (in particular the injectors and the pressure regulator) in
order to ensure the optimum engine operation.
The control unit is the "flash E.P.R.O.M." type w h i c h can be reprogrammed from the outside w i t h o u t in-
volving the hardware.
18
D I A G N O S T I C S O C K E T
The exchange of data between the injec-
tion/ignition control unit and the diagnostic
equipment takes place via a t w o direction se-
rial line (line K) using the standard Bosch
communication protocol.
The transmission is in positive logic and the
coding takes place via the NRZ method (Non
Return Zero) at a baud rate of 4.8 kbaud (208
us/bit ±5%)
Location of diagnostic socket
The arrow in the diagram shows the location
of the diagnostic socket.
P4A15JJ01
Actuators
- Butterfly casing actuator
- Phase transformer solenoid valve
- Fuel vapour cut out solenoid valve
- Variable geometry manifold solenoid valve
- Electric fuel p u m p (including filter and
pressure regulator)
- Injectors
- Ignition coils
- Spark plugs
Bravo 0 i 20v
98 range
Print no. 506.670/16