194003082 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - OPERATIONAL DESCRIPTION

The engine management control unit M10 controls and governs the entire electronic injection system.The control unit M10 is supplied directly by the battery at pin 32 of connector A via a line protected by fuse F18 of the engine compartment junction unit B001The ignition-operated power supply (15/54 from the steering lock control unit) is received from a line protected by fuse F16 of B001 at pin 64 of connector A.The main injection relay T9 of B001 controls the entire system: it is energized by an earth signal from pin 62 of connector A of the control unit M010 and then forwards a power supply:- to the injectors N070 and the ignition module A031 - pin 2 - through the line protected by fuse F22 of B001;- to the vapour recovery solenoid valve L010, to the Lambda sensors on the catalyzer K017 and K018, to the electronic thermostat N086, to the intake variable geometry solenoid valve L015, to the intake side N092 and exhaust side N093 phase transformer solenoid valve and to the air flow meter K041, via the line protected by fuse F11 of B001;- to pins 31 and 47 of connector A of control unit M010 via a line protected by fuse F17 of B001;The fuel pump relay T10 of B001 is supplied by the line protected by fuse F21 of B001.This is energized by a (positive) command signal from pin 49 of connector A of control unit M10 and supplies power to the fuel pump N40 , which is earthed via the inertia switch I50 , that cuts off the circuit in the case of impact and thus prevents dangerous flows of fuel.The engine management control unit M010 receives signals from the various sensors in order to control all engine service parameters.The engine coolant temperature sensor on the radiator hose K036 receives a reference earth and sends a temperature signal to engine management control unit M010, to pins 3 and 28 of connector A respectively.The engine coolant temperature sensor on the thermostat K036 receives a reference earth and sends a temperature signal to the engine management control unit M010, to pins 25 and 60 of connector B respectively.The detonation sensor K050 provides information, by means of frequency signals, concerning the onset of detonation in the combustion chamber: it receives a reference earth from pin 27 of connector B of M010 and sends the respective signal to pin 10 of control unit connector B. An earth signal is sent, from pin 44 of connector B of M010, to the screening for the cables connecting the detonation sensor K050 with the engine management control unit.The engine prm sensor K046, located at the rear of the crankshaft, receives a positive signal and a reference earth respectively from pins 42 and 39 of connector B of the engine management control unit M010 and provides information concerning the engine speed by means of a signal sent to pin 35 of connector B of the control unit.The control unit M10 receives - at pin 5 of connector B - a signal from the minimum engine oil pressure sensor K30.A negative reference signal is sent by the engine management control unit M010, from pin 42 of connector A, to the engine oil level sensor K032 and the signal is received at pin 36 of connector B.The air flow meter K041 sends pin 59 of connector B a signal proportional to the air flow rate. K041 also contains an air temperature sensor: the reference earth is provided by pin 28 of connector B of M010, while pin 12 of connector B receives the air temperature signal.The Lambda sensor upstream of the catalyzer K017 and the one downstream K018 provide the control unit M010 with information concerning the correct composition of the air/fuel mixture.The Lambda sensor K017 sends a signal to pin 53 of connector B of M010, while pin 23 provides a reference earth. An earth signal is sent, from pin 6 of connector B of M010, to the screening for the cables connecting the sensor inside the Lambda sensor K017 with the engine management control unit. The sensor is heated by a coil to ensure correct operation even when cold, via an earth signal from pin 58 of connector B of M010.The Lambda sensor K018 sends a signal to pin 54 of connector B of M010, while pin 29 provides a reference earth. An earth signal is sent, from pin 11 of connector B of M010, to the screening for the cables connecting the sensor inside the Lambda sensor K018 with the engine management control unit. The sensor is heated by a coil to ensure correct operation even when cold, via an earth signal from pin 19 of connector B of M010.The 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. The valve L010 is opened by the control unit when the motor is loaded via an earth signal from pin 46 of connector B of M010.The variable geometry control solenoid L015 is controlled by means of an earth signal from pin 3 of connector B of the engine control unit.The intake side timing sensor K106 receives a power supply form pin 42 of connector B of control unit M010 and a reference earth from pin 26 of connector B and sends a frequency signal corresponding to the timing to pin 21 of connector B of the actual control unit.The exhaust side timing sensor K107 receives a power supply form pin 42 of connector B of control unit M010 and a reference earth from pin 7 of connector B and sends a frequency signal corresponding to the timing to pin 56 of connector B of the actual control unit.The inlet side phase transformer N092 mechanically controls the timing advance at the intake: it is controlled by pin 56 of connector B of the control unit M010.The exhaust side phase transformer N093 mechanically controls the timing advance at the exhaust: it is controlled by pin 55 of connector B of the control unit M010.The accelerator pedal K055 is equipped with two built-in potentiometers: a main one and one safety one. The former receives power and earth signals from pins 24 and 26 of connector A and sends a corresponding signal to pin 54 of the same connector of M010. The latter receives power and earth signals from pins 25 and 27 of connector A of M010 and sends a corresponding signal to pin 53 of the same connector.According to the signal from accelerator pedal K055, control unit M010 controls the throttle opening by means of a motor built into throttle body N075. Pins 31-32 (positive) of connector B of M010 control the closure of the motorised throttle, while pins 47-48 (negative) of the same connector control the opening.The throttle body actuator N075 is equipped with two integral potentiometers: a main one and one safety one. The former receives power and earth signals from pins 41 and 40 of connector B and sends a corresponding signal to pin 9 of the same connector of M010. The latter also receives power and earth signals from pins 41 and 40 of connector B of M010 and sends a corresponding signal to pin 8 of the same connector.The engine management control unit M010 controls the opening of the individual injectors N070, via appropriate (duty-cycle type) signals sent from pins 64 (cyl.1), 61 (cyl.2), 62 (cyl.3), 63 (cyl.4) of connector B.The injectors N070 receive a power supply to enable the energizing of the main relay T9 of B001.The ignition module A031 contains 4 coils (one per cylinder). The engine management control unit M010 controls the main windings by means of the signals sent from pins 1-2 (cyl.1), 17-18 (cyl.2), 33-34 (cyl.3), 49-50 (cyl.4) of connector B, whilst the secondary windings send the impulse to the spark plugs. Pin 1 of A031 is connected to the earth on the engine C040.Pin 57 of connector A of control unit M010 receives an NA signal from the switch on brake pedal I030, supplied by an ignition-controlled supply (INT from the steering lock control unit) via a line protected by fuse F37 of junction unit B002.Pin 45 of connector A of control unit M010 receives an NC signal from the switch on brake pedal I030, also supplied by an ignition-controlled supply (INT from the steering lock control unit) via a line protected by fuse F35 of junction unit B002.Pin 16 of connector A of M010 receives an earth signal from clutch pedal switch I031.The control unit M010 then connects via the CAN - pins 6, 38 and 37, 21 - to the Body Computer M001 - pins 36 and 37 of connector B - and to the other network nodes. Via this connection, it sends information on:- engine 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 in the instrument panel E50;- minimum engine oil pressure, which is sent to the instrument panel E50 that controls the warning light.The control unit M010 receives the speedometer signal produced by the ABS/ESP control unit M051 via the CAN.The control unit self-diagnostic system M010 also generates a negative signal that leaves pin 1 of connector A - that is connected directly to the EOBD warning light located in instrument panel E050 .The check function within the instrument panel E050 monitors the operation of the inertia switch and checks for faults in the oil pressure sensor: if faults are detected, the general failure warning light is turned on and the information is shown simultaneously on the display.The control unit autodiagnostic data can be read by connecting to connector C of M001, pin 7: it receives signals from pin 5 of connector A of M010 via the special diagnostic K line.