Engine management control unit M010 controls and governs the entire electronic ignition and injection system.An battery-controlled supply reaches the engine management control unit (pin 15 of connector A) via fuse F18 of engine bay junction unit B001. See E1010 SUPPLYAn ignition-operated supply (15/54) is received (pin 47 of connector A) from a line protected by fuse F16 of control unit B001.The main injection relay R09 (inside B001) controls the entire system: t is excited by an earth signal 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 B001;
to air flow meter K041, to fuel vapour recovery solenoid L010, to the lambda sensors on preconverter K015, on preconverter 2 K016, on converter K017 and on converter 2 K018, via a line protected by fuse F11 of B001;
to injectors N070 and ignition coils A030, via a line protected by fuse F22 of B001.
Fuel pump relay R10 inside junction unit B001, whose coil is excited by an earth signal from engine control unit M010 (pin 30 of connector A), supplies fuel pump N040 via a line protected by fuse F21 of B001; pump N040 is connected to earth via inertia switch I050 that interrupts the circuit and thus stops the fuel supply in the case of impact.Control unit M010 receives signals from the various sensors in order to control all engine service parameters.RPM sensor K046 provides engine rpm information via a frequency signal sent to pins 10 and 59 of connector B: these two signals are very low intensity and are thus appropriately shielded.Timing sensor K047 is supplied from pin 51 of connector B of control unit M010 and receives a reference earth from pin 26 of connector B; this sensor in turn sends the control unit a frequency signal corresponding to phase (pin 42 of connector B).Engine coolant sensor K045 receives a reference earth from pin 26 of connector B of control unit M010 and sends a signal proportional to engine coolant temperature to pin 25 of connector B of the control unit.Knock sensors K050 and K051 provide information on knock conditions via frequency signals sent respectively to pins 22 and 38 of connector B of the engine control unit: these two signals are very low intensity and are thus appropriately shielded. An earth signal is sent to pins 54 and 6 of connector B of control unit M010 respectively.All four lambda sensors K015, K016, K017 and K018 provide engine management unit M010 with information on the correct composition of the air-fuel mixture in two different exhaust positions: two upstream and the others downstream of the catalytic converter.The sensor on the preconverter K015 sends a signal to pin 23 of connector B of M010, while pin 55 provides a reference earth. The sensor is heated by a coil to ensure correct operation even when cold, via an earth signal from pin 34 of connector B of M010.The sensor on the converter K017 sends a signal to pin 28 of connector B of M010, while pin 60 provides a reference earth. The sensor is heated via an earth signal from pin 50 of connector B.The sensor on the preconverter 2 K015 sends a signal to pin 39 of connector B of M010, while pin 7 provides a reference earth. The sensor is heated via an earth signal from pin 2 of connector B.The sensor on the converter 2 K018 sends a signal to pin 44 of connector B of M010, while pin 12 provides a reference earth. The sensor is heated via an earth signal from pin 18 of connector B.Fuel vapour recovery solenoid L010 allows fuel vapours to flow through toward the engine intake, where they join the mixture that is entering the combustion chamber. Valve L010 is opened by the control unit when the motor is loaded via an earth signal from pin 2 of connector A of M010.Engine management unit M010 controls the opening of individual injectors N070, via appropriate signals (duty-cycle type) sent from pins 19 (cyl.A), 3 (cyl.B), 20 (cyl.C), 35 (cyl.D), 52 (cyl.E), 36 (cyl. F) of connector B.Injectors N070 receive a supply to enable excitation of main relay R9 of B001.Control unit M010 also controls ignition coils A030 via control signals (earth) for the coil primary windings while the secondary winding sends a pulse to the spark plugs: from pins 16 (coil A), 15 (coil B), 14 (coil C), 32 (coil D), 31 (coil E), 30 (coil F) of connector B.The primary windings of coils A030 receive a supply to enable excitation of main relay R09 of B001.Throttle body actuator N075 is equipped with two integral potentiometers connected in parallel: this controls throttle opening by means of a step motor. The motor receives power from pins 17-49 and 1-33 of connector B of M010.Pin 58 of connector B sends power to both potentiometers, while pin 26 sends an earth signal; pins 24 and 40 of the same connector receive signals that reach throttle body actuator N075.Air flow meter (debimeter) K041 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.K041 also contains an air temperature sensor: a reference earth is provided by pin 25 of connector A of M010, while pin 54 of connector A receives an air temperature signal.Linear sensor K120 is connected to control unit M010 at pins 63 and 25 of connector A for the power supply and earth and pin 38 for signal transmission.Accelerator pedal K055 is equipped with two built-in potentiometers: a main potentiometer and a stand-by potentiometer. The former receives power and earth signals from pins 56 and 24 of connector A and sends a correspondong signal to pin 8 of the same connector of M010. The latter receives power and earth signals from pins 7 and 25 of connector A of M010 and sends a corresponding signal to pin 40 of the same connector.Pin 27 of connector A of the engine management unit receives a signal from brake light switch (normally open) I030, while pin 26 receives a signal from the normally closed switch (see Wiring diagram E2021 Brake lights).The engine control unit receives a signal from low engine oil pressure switch K030 at pin 60 of connector A.Control unit M010 is then connected via the C-CAN network (pins 45 and 61 of connector A) to Body Computer M001 (pins 32 and 33 of connector B) and the other network nodes; it uses this connection to send information on engine coolant temperature, engine rpm, EOBD engine control system faults and engine oil pressure (see Wiring Diagram E4010 On-Board Instrument).It also receives a speedometer signal generated by M051 (pins 1 and 2) via the C-CAN network (pins 12 and 29 of connector A).Automatic transmission control unit M055 sends an individual EOBD device fault signal via the C-CAN network (pins 12 and 13 of connector A) to control unit M010. The control unit self-diagnosis system M010 then generates a signal (pin 46 of connector A) that is connected directly to the EOBD warning light inside the instrument panel E050, and causes a fault message to appear on the matrix display.