Fiat 1998 Marea Weekend, Service Manual

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Marea- Marea Weekend
' f t i ™
Engine
'98 range
Fuel system
10.
The BOSCH MSA11 electronic control unit (1) receives the following information:
- accelerator pedal position from the potentiometer connected to it (3);
- engine rpm from the sensor mounted on the engine block (10);
- intake air quantity from the flowmeter (7);
- quantity of fuel injected from the sensor mounted on the actuator contained in the fuel injection pump
(2);
- intake air temperature from the relevant sensor (20);
- diesel temperature from the sensor located in the fuel injection pump (2);
- coolant temperature from the sensor (4);
- actual start of injection (opening of fuel injector pintle) from the instrumented fuel injector (8), locat-
ed on cylinder 1;
- car speed from speedometer sensor (9) located on the gearbox;
- brake operation information from the switch (6) located on the brake pedal;
- clutch operation from the switch (5) located on the clutch pedal;
- atmospheric pressure from the sensor located inside the control unit (1);
- signal requesting the switching on of the air conditioner compressor from the air conditioning system (15).
Depending on the input values, the electronic control unit (1) consults the mapped values in its memory
and corrects the output values accordingly, thus managing:
- the actuator controlling the quantity of fuel contained in the fuel injection pump (2);
- the fuel injection advance regulation solenoid contained in the fuel injection pump (2);
- the engine stop solenoid contained in the fuel injection pump (2);
- the heater plug control unit (17);
- the Borg Warner (14) vacuum modulating solenoid controlling the E.G.R. valve;
- the heater plugs warning light (16);
- the fuel injection fault warning light (13);
- the rev counter (11);
- the engagement of the air conditioner compressor electromagnetic clutch (15);
- the diagnostic socket (12).
The control unit also has the function of blocking engine starting (Fiat CODE).
This function is carried out by a specific control unit (Fiat CODE) (18), which can dialogue with the
electronic control unit (1), and an electronic key with a special transmitter for sending a recognition
code.
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