Engine
Fuel system
Marea- Marea Weekend
9 ^
99 range
DIAGNOSTIC SOCKET
The exchange of data between the injec-
tion/ignition control unit and the diagnostic
equipment takes place via a two-way serial line
(line K) using the standard Bosch communica-
tion protocol.
The positive logic transmission and the coding
of the data is carried out through the NRZ
methods (Non Return Zero) at a 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.
INJECTION/IGNITION SYSTEM COMPONENTS
The injection/ignition system mainly consists of wiring, an electronic control unit (I.E. control unit) and
the following sensors/actuators:
Sensors
- Speedometer sensor
- Rpm and T.D.C. sensor
- Detonation sensors
- Engine 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
Actuators
- Butterfly casing actuator
- Phase transformer solenoid avlve
- Fuel vapour cut out solenoid valve
- Variable geometry manifold solenoid valve
- Electric fuel pump (including filter and pres-
sure regulator)
- Injectors
- Ignition coils
- Spark plugs
INJECTION/IGNITION SYSTEM WIRING
The different system components are connected by two distinct sets of wiring.
The engine side wiring (connector M) connects 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
constitutes the interface with the other vehicle wiring.
The two connectors (M and F) are the same and both have 64 pins, but it is not possible to mix up the
control unit connector wiring.
INJECTION/IGNITION ELECTRONIC CONTROL UNIT
The injection/ignition electronic control unit is located in the engine compartment/ fixed to a bracket at
the side of the inlet manifold.
The control unit processes the signals coming from the various sensors through the application of software
algorhythms and operates the actuators (in particular, the injectors and the pressure regulator) in order to
ensure the best possible operation of the engine.
The control unit is the flash E.P.R.O.M. type, i.e. it can be reprogrammed from the outside without having
to adjust the hardware.
18
Print n° 506.763/14
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