192004587 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - FUNCTIONAL DESCRIPTION

Functional description

The engine control unit M10 monitors and controls the entire electronic ignition and injection system.The control unit M10 is supplied directly by the battery at pin 4 of connector A, via a line protected by fuse F18 of the unit B1 .The supply controlled by the ignition (15/54) reaches pin 24 of connector A of M10 from the line protected by fuse F16 of the engine compartment unit B1 .

The main injection relay T9 of B1 controls the entire system: this is excited by a control signal (earth) received from pin 11 of connector A of control unit M10 and then sends power:

to the injectors N70 and the coils A30 , via the line protected by fuse F22 of B1 .
the fuel vapour recovery solenoid L10 , variable geometry control solenoid L15 , variable valve timing actuator N76 and Lambda sensors K15 and K17 via a line protected by fuse F11 of B1 ;
to pins 1, 2 and 3 of control unit M10 , and sensors K41 and K47 via the line protected by fuse F17 of B1 ;

The fuel pump relay T10 of B1 is supplied by the line of the fuse F21 of B1 .It is energized by a control signal (earth) from pin 7 of connector A of control unit M10 and supplies power to fuel pump N40 , which is earthed through the inertia switch I50 , which cuts off the circuit in the case of a crash and so prevents the dangerous spilling of fuel. Pins 5, 6, 23, 40, 41, 44 and 58 of connector B of M10 are earthed.The engine control unit M10 receives signals from the various sensors in order to monitor all engine operating conditions. Rpm sensor K46 provides information on engine speed via a frequency signal sent to pin 36 of connector B (positive) and pin 37 of connector B (negative) of control unit M10 . These two signals are very low intensity and are therefore shielded - pin 38.Engine temperature sender unit K36 receives a reference earth from pin 26 and supplies a signal proportional to coolant temperature to pin 27 of connector B of control unit M10 .The detonation sensor K50 provides information concerning the onset of detonation in the combustion chamber through frequency signals: it sends two signals to pins 29 (positive) and 30 (negative) of connector B of M10 ; these signals are also suitably shielded.The three Lambda probes K15, K16 and K17 provide the control unit M10 information concerning the correct composition of the air-fuel mixture in three different positions of the exhaust: two are upstream of the precatalyzers, the third is upstream of the main catalyzer.The probe K15 , on the right precatalyzer, sends the signal to pin 22 of connector A of M10 , while pin 21 supplies the reference earth. Probe K15 is heated by a resistor in order to ensure it works efficiently even when cold. The resistance is supplied by the main relay, and receives an earth signal from pin 60 of connector A of control unit M10 .The probe K16 , on the left precatalyzer, sends the signal to pin 20 of connector A of M10 , while pin 21 supplies the reference earth. The probe K16 is heated with a resistor, supplied by the main relay, and receives an earth signal from pin 59 of connector A of control unit M10 .The sensor K17 downstream of the main catalyzer sends the signal to pin 19 of connector A of M10 , while pin 21 supplies the reference earth. The sensor K17 is heated by a resisatnce supplied by the main relay and receives an earth signal from pin 58 of connector A of control unit M10 .The timing sensor K47 is supplied by the main relay. it receives a reference earth from pin 33 of connector B of the control unit M10 and sends a frequency signal corresponding to the timing of pin 34 of connector B of the control unit.The air flow meter K41 - supplied by the main relay, receives a reference earth from pin 13 of connector B of the control unt and sends pin 14 a signal proportional to the air flow rate. Accelerator pedal K55 comes with three built-in potentiometers. The first receives power and earth from pins 44 and 46 respectively of connector A of M10 and sends a corresponding signal to pin 45 of the same connector. The second receives power and earth from pins 47 and 49 respectively of connector A of M10 and sends a corresponding signal to pin 48 of connector A. The third receives power and earth from pins 50 and 52 respectively of connector A of M10 and sends a corresponding signal to pin 51 of connector A. Pin 54 of connector A of M10 receives a N.O. signal coming from the brake lights switch I30 , with the supply controlled by the ignition (INT) from fuse F37 of the junction unit B2.Pin 12 of connector A of M10 receives a N.C. signal coming from the brake lights switch I30 , with the supply controlled by the ignition (INT) from fuse F37 of the junction unit B2.Pin 26 of connector A of M10 receives the signal coming from the clutch switch I31 .The control unit M10 controls the opening of the injectors N70 through special signals sent from pins 1, 2, 3 and 4 of connector A of M10 . The injectors N70 receive the supply for the go ahead of the opening of the main relay.The control unit M10 also controls the coils A30 via the signals for the main coil winding - pins 7, 8, 9 and 10 of connector B of M10 , whilst the sencondary winding sends the impulse to the spark plugs. The coil A30 primary windings receive a signal to enable opening from the main relay.Throttle body actuator N75 is fitted with two built-in potentiometers connected in parallel: they control throttle opening via a stepping motor.The motor receives a supply from pin 59 and earth at pin 60 of connector B of M10 . Pins 18 and 21 send a power supply to both potentiometers, pins 20 and 23 supply an earth signal to the potentiometers, while pins 19 and 22 of the same connector receive signals from the throttle body actuator N75 .Fuel vapour recovery solenoid L10 allows fuel vapours to pass through to the engine intake where they join the mixture entering the combustion chamber. The valve L10 , supplied by the main relay, is opened by the control unit when the engine is loaded by a signal from pin 43 of connector B of M10 .The variable geometry solenoid valve L15 , supplied by the main relay, is operated by pin 45 of connector B of the control unit M10.The variable valve timing system N76 - supplied by the line for relay, is operated by the control unit M10 , pin 47 of connector B.The control unit M10 receives the signal for the minimum engine oil pressure sensor K30 at pin 33 of connector A.

The control unit M10 is connected via the CAN network - pins 39, 35, 36 and 40 - to the Body Computer M1 and the other nodes on the network: through this connection, it sends information concerning:

system self-test, which can be used by connecting to connector C of M1 .
engine water temperature, which is sent to the instrument panel E50 which manages the relevant gauge and warning light;
rpm, which is sent to the rev counter of the instrument panel E50 ;
engine oil minimum pressure, which is sent to instrument panel E50 which manages the relevant warning light;

It receives, via CAN, the speedometer signal generated by the ABS control unit M50The self-test system of the control unit M10 also generates a signal - which comes from pin 8 of connector A - which is connected directly to the ''EOBD'' warning light located in the instrument panel E50 .The self-test data can be read by connecting to connector C of the Body Computer M1 - pin 7: it receives the signals from pin 52 of connector A from the control unit M10 via the specific tester line.