223002853 - 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 16 of connector A, via a line protected by fuse F18 of the engine bay control unit B01 .The supply controlled by the ignition (15/54) reaches pins 12 and 29 of connector A of M10 from the line protected by fuse F16 of the engine compartment unit B01 .

The main injection relay R9 of B01 controls the entire system: this is energized by two control signals coming from pin 62 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 F17 of B01 .
  • to the fuel vapour recovery solenoid L10 and the Lambda sensors K15 and K17 and to the speedometer K84 via a line protected by fuse F11 of B01;
  • to the fuel pump N40 via the line protected by fuse F22 of B01 . The pump N40 is earthed via inertia switch I50 . In case of impact, this cuts off the circuit to prevent the danger of fuel delivery.
Pins 5, 6, 21 and 22 of connector B of M10 are earthed. The engine control unit M10 receives signals from the various sensors in order to monitor all engine service conditions.Rpm sensor K46 provides information on engine speed via a frequency signal sent to pins 9 (positive) and 23 (negative) of connector B of control unit M10 . These two signals are very low intensity and are therefore shielded.Timing sensor K47 is supplied from pin 13 of connector B of control unit M10 . It receives a reference earth from pin 7 and sends a frequency signal corresponding to the timing to pin 24 of M10 .The integrated air temperature sensor K43 receives a reference earth from pin 7 of connector B; it sends a signal corresponding to the intake air temperature to pin 63 of the control unit. From pin 13 of connector B of M10 a reference supply is sent to the sensor K43 which restores a signal, at pin 31, proportional to the pressure of the intake air.The engine temperature sensor K45 , receives a reference earth from pin 36 of the control unit M10 and supplies a signal proportional to the temperature of the engine coolant to pin 45 of the control unit.The knock sensor K50 provides information concerning the onset of knock in the combustion chamber through frequency signals: it sends two signals to pin 41 of connector B (positive) and 48 (negative ) of M10 ; these signals are also suitably shielded.The Lambda sensor at the pre-catalyzer K15 and the one at the catalyzer K17 provide the control unit M10 with information concerning the correct composition of the air/fuel mixture and the catalyzer operating conditions:The sensor K15 sends a signal to pin 60 of connector B of the control unit, whilst pin 43 provides a reference supply: the intensity of these two signals is extremely low and therefore they are appropriately shielded. Sensor K15 is heated by a resistor in order to ensure it works efficiently even when cold; the resistance is supplied by the main relay R9; pin 32 of connector B of M10 provides the earth.The sensor K17 sends a signal to pin 42 of connector B of the control unit, whlst pin 58 provides the reference supply: the intensity of these two signals is extremely low and therefore they are appropriately shielded. Probe K17 is heated by a resistor in order to ensure it works efficiently even when cold; the resistance is supplied by the main relay R9; pin 64 of connector B of M10 provides the earth.Accelerator pedal K55 is fitted with two built-in potentiometers (a main one and a safety back-up). The first receives power and earth from pins 2 and 46 respectively of connector A of M10 and sends a corresponding signal to pin 42 of the same connector. The second receives power and earth from pins 3 and 15 respectively of connector A of M10 and sends a corresponding signal to pin 40 of connector A.Pin 50 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 via special signals sent from pins 50, 34, 49 and 33 of connector B di M10 . The injectors N70 receive a power supply to enable the opening from the main relay R9 of B01 .The control unit M10 also controls the coils A30 through the signals for the coil primary winding, whilst the secondary winding sends the impulse to the spark plugs: fromi pins 17, 19, 3 and 1 of connector B of M10 . The coil A30 primary windings receive a signal to enable opening from the main relay R9 of B01 .Throttle body actuator N75 is fitted with two built-in potentiometers connected in parallel: they control throttle opening via a stepper motor.The motor receives information from pins 52 and 57 of connector B of M10 . Pin 15 of connector B sends a power supply to both potentiometers, pin 35 supplies an earth signal to the potentiometers, while pins 44 and 30 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. Valve L10 is supplied by the main relay R9 of B01 ; it is opened by the control unit when the engine is loaded by a signal from pin 51 of connector B of M10 .The control unit M10 receives the signal for the minimum engine oil pressure sensor K30 at pin 7 of connector A.The signals from the normally closed and normally open contacts of the brake pedal switch I30 are received at pins 34 and 35 connector A, respectively.

The control unit M10 is connected via the CAN - pins 36 and 52 of connector A to the Body Computer M01 and the other nodes in the network: through this connection, it sends information concerning:

  • system self-test, which can be used by connecting to connector B of M01.
  • failure of the injection system and/or signalling of an incorrect exhaust gas emission - EOBD - (faults displayed via the special amber yellow warning light in the instrument panel E50);
  • 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;
On the other hand it receives the speedometer signal, produced by sensor K84 , via the CAN.The self-test data can be read by connecting to connector B of the Body Computer M01 - pin 7: it receives the signals from pin 10 of connector A from the control unit M10 via the specific tester line.Control unit M10 is connected to the air conditioning system via pins 6, 14, 26 and 64 of connector A. This allows engine idling speed to be adjusted to increased engine load whenever the compressor is activated, or to turn off the compressor in the case of high speeds or high engine loads .     See E5020 ENGINE COOLINGThe control unit also controls the engine cooling system: pins 55 and 59 connector A control the engagement of the relevant fan.