125002420 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - OPERATIONAL DESCRIPTION

Operational description

Engine management control unit M10controls and regulates the entire electronic ignition and injection system.The direct system power supply is received from the battery via the line of maxifuse CVM located on the battery, connector B99.The ignition-controlled power supply (15/54) is received from a line protected by fuse F16 from the engine compartment control unit B1to pin 47 of connector A of M10.The control unit M10is supplied directly by the battery at pin 15 of connector A, via a line protected by fuse F18 of the unitB1.

Main injection relay T9 of B1 controls the entire system: t is energized by an control signal (earth) from pin 31 of connector A of engine control unit M010 and then forwards a power supply:

• to pins 16, 32 and 48 of connector A of the control unit via a line protected by fuse F17 of B1 ;
• to air flow meter K41 , to fuel vapour recovery solenoid L10 , to variable geometry control solenoid L15, to VVT actuator N76 and to lambda sensorsK15 , K16 and K17 ; (all these lines are protected by fuse F11 of B1 ;
• to injectors N70 , and coils A30 , via a line protected by fuse F22 of B1 .

Fuel pump relay T10 of B1is supplied by fuse F21 of B1.it is energized by a control signal (earth) coming from pin 30 f connector A of the junction unit M10and supplies power to electric fuel pump N40, which is earthed via inertia switch I50.. which cuts out the circuit in case of impact and thus prevents a hazardous outflow of fuel.The control unit M10receives signals from the various sensors in order to control all engine service parameters.rpm sensor K46supplies, via frequency signal sent to pins 10 and 59 of connector B of control unit M10, information on engine speed: these two signals are very low intensity and are thus appropriately shielded.timing sensor K47is supplied from pin 51 of connector B of control unit M10, receives a reference earth from pin 26 of connector B and sends a signal with frequency corresponding to the fuel pressure to pin 42 of control unit connector B.Engine temperature sender unitK36receives a reference earth from pin 26 of connector B of control unit M10and supplies a signal proportional to coolant temperature to pin 25 of control unit connector B.The three lambda sensors K15, K16and K17supply control unit M10with information on the correct composition of the air-fuel mixture in three different exhaust positions: two upstream of the preconverters, the third downstream of the main catalytic converter.Sensor K15on the right preconverter, sends a signal to pin 23 of connector B of M10, while pin 55 supplies a reference earth. Sensor K15is heated by a coil to ensure it works efficiently even when cold. The resistance is supplied by the main relay and receives an earth signal from pin 34 of connector B of control unit M10.Sensor K16on the left preconverter, sends a signal to pin 39 of connector B of M10, while pin 7 supplies a reference earth. Sensor K16is heated by a coil supplied by the main relay and receives an earth signal from pin 2 of connector B of control unit M10.Sensor K17downstream of the main catalytic converter sends a signal to pin 28 of connector B of M10, while pin 60 supplies a reference earth. Sensor K17is heated by a coil supplied by the main relay and receives an earth signal from pin 50 of connector B of control unit M10.Knock sensor K50provides, via a frequency signal sent to pin 22 of connector B of control unit M10Air flow meterK41Air flow meter K41(supplied by the main relay) receives a reference voltage from pin 63 of engine management unit connector A and sends a signal proportional to air flow to pin 57 of connector A. Inside K41there is also an air temperature sensor: a sensor reference earth is supplied by pin 25 of connector A of M10, while pin 54 of connector A receives the air temperature signal.accelerator pedal K55is fitted with two integral potentiometers (a main one and a safety one). The first receives a power supply and earth, respectively, from pins 56 and 24 of connector A of M10and sends the signal to pin 8 of the same connector. The second receives a power supply and earth, respectively, from pins 7 and 25 of connector A of M10and sends the signal to pin 40 of the same connector.Pin 27 of connector A of M10receives a signal from the brake light switch I30supplied by an ignition-operated supply (INT) from fuse F37 of junction unit B2.Pin 59 of connector A of M10receives the signal coming from the clutch switch I31.The control unit M10controls the opening of the individual injectors N70, via duty cycle signals - sent from pins 19 (cyl 1), 52 (cyl. 2), 35 (cyl. 3) and 3 (cyl. 4) of connector B of M10.Injectors N70receive a power supply to enable opening from the main relay.The control unit M10also controls coils A30via control signals (earth) to the coil primary windings, while the second winding sends a pulse to the spark plugs: from pins 16, 31, 30 and 14 of connector B of M10 for cylinders 1, 2, 3 and 4 respectivelyfor cylinders 2-3.The primary windings of coils A30receive a power supply to enable opening from the main relay.Throttle body actuator N75is equipped with two built-in potentiometers connected in parallel: this controls throttle opening by means of a step motor.The motor receives a supply from pins 17 - 49 and 1 - 33 of connector B of M10.. Pin 58 of connector B sends power to both potentiometers, while pin 26 sends an earth signal to the potentiometers; pins 24 and 41 of the same connector receive signals that reach throttle body actuator N75.Fuel vapour recovery solenoid L10allows fuel vapours to flow through toward the engine intake, where they join the mixture that is entering the combustion chamber. Valve L10, supplied by the main relay, is opened by the control unit when the engine is subject to load via a duty cycle signal from pin 5 of connector B of M10Variable geometry control solenoid L15 is controlled from pin 4 of connector B of control unit M010.timing sensor N76controls the intake timing advance mechanically: it is supplied from pin 36 of connector B of the control unitThe control unit M10receives - at pin 60 of connector A - a signal from the minimum engine oil pressure sensor K30.

Control unit M10 is then connected via the CAN to Body Computer M1 and other nodes in the network: it sends information through this connection on:

• system self-diagnosis, which may be used by connecting to connector G of M1 .
• coolant temperature, which is sent to instrument panel E50 that controls the gauge and warning light;
• engine rpm, that is sent to the rev counter on instrument panel E50;
• minimum engine oil pressure, which is sent to instrument panel E50 that controls the warning light;

It receives, via the CAN, a speedometer signal generated by ABS control unit M50Control unit self-diagnostic signal M10also generates a signal - that leaves pin 46 of connector A - that is connected directly to the EOBD warning light located in the instrument panel E50.Self-diagnostic data can be read by connecting to connector G of the Body Computer M1- pin 7: receives signals from pin 53 of connector A of control unit M10via the special diagnostic line.