Engine management control unit M10 controls and governs the entire electronic ignition and injection system.The ignition-operated power supply arrives via a line protected by fuse F20 of the engine compartment control unit B1 at pin 28 of connector A of M10.Pins 2, 4 and 6 of connector A of M10 are earthed.Main injection relay T7 of B1 controls the entire system: this is protected by a line protected by fuse F43 of engine compartment control unit B1 and is excited by a control signal (earth) from pin 72 of connector A of control unit M10 and thus sends a power supply:- to pin 1 of connector A of the control unit, via the line of fuse F29 of B1 ;- to pin 5 of connector A of the control unit, via the line of fuse F28 of B1 ;- to solenoids L30 and L36, to throttle N75, to control unit M15 and to lambda sensor K40 via the line of fuse F27 of B1.Fuel pump relay T8 of B1 is supplied by the line protected by fuse F30 of B1. This is energized by a command signal (earth) from pin 20 of connector A of control unit M10 and supplies power to fuel pump N40, which is earthed via inertia switch I50, which cuts off the circuit in the event of impact and thus prevents dangerous flows of fuel.Control unit M15, which manages the preheating of the heater plugs A40, is supplied directly - connector A - from the battery via a line protected by MAXIFUSE F7 of B99.This is supplied - connector B - from the line of fuse F22 of B1 and exchanges command and control signals with pins 52 and 93 of connector A of M10, which controls the timing. Connector C is connected to spark plugs A40.The engine management control unit M10 receives signals from the various sensors, thereby keeping all the engine operating parameters under control.Rpm sensor K46 supplies information on engine speed, via a frequency signal exchanged with pins 12 and 27 of connector B of control unit M10.Timing sensor K47 is supplied from pin 11 of connector B of M10. It receives a reference earth from pin 20 of connector B of control unit M10 and this in turn generates a frequency signal corresponding to the phase at pin 50 of connector B.Engine temperature sensor K36 receives a reference earth from pin 41 of connector B of control unit M10, and sends a signal proportional to engine coolant temperature to pin 58 of connector B.The air flow meter K41 - receiving an ignition-controlled supply via the line protected by fuse F59 of control unit B1 - receives a reference earth from pin 44 of connector B of M10 and sends pin 42 of connector B a signal proportional to the air flow rate.An air temperature sensor inside K41 also sends an air temperature signal to pin 37 of connector B of M10.The accelerator pedal K55 has two built-in potentiometers (a main one and a safety one).The former receives power and earth signals respectively from pins 9 and 45 of connector A of M10 and sends a corresponding signal to pin 30.The latter receives power and earth signals respectively from pins 46 and 8 of connector A of M10 and sends a signal to pin 31.The fuel temperature sensor, incorporated in the diesel filter K101, detects the temperature of the incoming diesel fuel. It receives a reference earth from pin 10 of connector A of M10 and sends a fuel temperature signal to pin 11.The turbocharging sensor K44 measures the pressure and the temperature in the intake chamber, downstream of the turbocharger. It is supplied by pin 13 of connector B of M10 and receives a reference earth from pin 23 of connector B.The signal corresponding to the pressure value is sent to pin 40 of control unit connector B. An air temperature sensor, housed in K44, sends a signal to pin 53 of connector B of M10.Fuel pressure sensor K83 supplies the injection control unit with a feedback signal to modulate injection pressure and duration.It receives power and a reference earth respectively from pins 28 and 8 of connector B of M10; it then sends a pressure signal to pin 43.Lambda sensor K40 - PRESENT ONLY IN THE VERSION WITHOUT PARTICULATE FILTER - sends signals to pins 64, 65 and 87 of connector A of M10 while pin 86 supplies a reference earth. Sensor K40 is heated by a coil to ensure correct operation even when cold. The coil is supplied by the line from fuse 27 of B1 and receives an earth signal from pin 51 of connector A of control unit M10.The fuel pressure regulator on the pump N77 controls the high pressure produced by the actual pump; the two control signals come from pins 19 and 49 of connector B of control unit M10.The EGR solenoid L30 controls exhaust gas recirculation. It is supplied by a line from fuse F27 of B1, and is controlled by a signal from pin 60 of connector B of M10.The turbine variable geometry solenoid L36 regulates the operation of the turbine according to the engine load: it is supplied by the line from fuse F27 of B1 and is controlled by a signal from pin 7 of connector A of M10.The throttle body actuator N75 controls the opening of the throttle by means of a step motor; the motor receives a power supply from the line for fuse F27 of B1 and is controlled by a signal for pin 59 of connector B of M10. The control signals leave from pins 39 and 52 of connector B of M10.The engine management control unit sends the command to the injectors N70 from pins 16-47, 2-31, 1-46, 17-33 of connector B of M10 for cylinders 1, 2, 3 and 4, respectively.Pin 17 of connector A of M10 receives a signal from brake light switch I30 - N.O. contact - provided with an ignition-controlled power supply from fuse F22 of Body Computer M1. It receives, via the CAN, a signal - N.C. contact - from brake light switch I30, supplied with an ignition controlled supply from fuse F26 of Body Computer M1.Pin 40 of connector A of M10 receives the signal coming from the clutch switch I31.Pin 57 of connector A of M10 receives the signal coming from the clutch switch I20.The control unit M10 receives - at pin 56 of connector B - a signal from the minimum engine oil pressure sensor K30The control unit M10 receives - at pin 21 of connector B - a signal from the minimum engine oil pressure sensor K32The water in diesel filter sensor built into filter K101 receives an ignition-operated supply from fuse F59 of control unit B1 and sends a corresponding signal to pin 74 of connector A of M10.The control unit M10 is then connected via the CAN - pin 83-84 of connector A of M10 - to the Body Computer M1 and to the other network nodes. Through this connection, it sends information about:The control unit M10 is then connected via the CAN to the Body Computer M1 and to the other network nodes: information on the following is sent through this connection- system self-diagnosis, which may be used by connecting to connector R10;- engine coolant temperature, which is sent to the instrument panel E50 which manages the gauge and the warning light;- engine rpm, which is sent to the instrument panel E50 rev counter;- minimum engine oil pressure and level, which is sent to instrument panel E50, which manages the warning lights and signals;- heater plugs pre-heating, sent to instrument panel E50, which controls the warning light;- water in the diesel filter, sent to instrument panel E50, which controls the display;It receives a speedometer signal via the CAN network that is generated by the ABS control unit M50.The autodiagnostic system for the control unit M10 also produces a signal - which leaves pin 71 of connector A - which is connected directly to the EOBD warning light in the instrument panel E50.