2892629 - E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT - Functional description (Euro 3)

Functional description

The engine control unit M10 monitors and controls the UNIJET electronic injection system. The supply for the engine control unit M10 is controlled by the ignition (15/54) at pin 58 by the line protected by fuse F25 . The relay J10 controls the supply of the system: it is supplied by the battery, the line for maxifuse UGD of B5 , the coil is supplied by the same line and is energized by an earth signal coming from the control unit M10 , from pin 13. This energizing makes it possible to supply pin 5 of the control unit and shunt fuses B40 and B41 . Pin 4 of M10 is supplied by the line protected by fuse B40 . The relay J15 is also supplied by the battery, from the line for maxifuse UGD: pin 24 of control unit M10 and the line from fuse B40 receive signals which energize the relay J15, which provides the supply to the fuel pump N40, which is connected to earth through the inertia switch I50. In case of impact, this cuts off the circuit to prevent the danger of fuel delivery. The diesel pre-heating relay J17 , supplied by the battery through the line protected by fuses B37 and B39 , is energized by the signal coming from pin 111 of M10 . Under these circumstances the relay controls the operation of the diesel heating element O20. The control unit M15 , which manages the pre-heating of the heater plugs A40 , is supplied - connector A - directly by the battery through the line protected by fuse B37 . It is supplied, connector C, by the line for fuse B41 and exchanges command and control signals with pins 22 and 62 of M10 which controls the timing. Connector B is connected to the heater plugs A40 . Pins 1, 2 and 3 of M10 are earthed. The engine control unit M10 receives signals from the various sensors in order to monitor all engine service conditions. The rpm sensor K46 provides information concerning the engine speed through a frequency signal sent to pin 100 of the control unit M10 . It receives an earth signal from pin 99 of the control unit. Both signals are weak and are therefore suitably shielded by pin 101. Timing sensor K47 is supplied by pin 102 of M10 . It receives a reference earth from pin 104 of the control unit M10 and sends a frequency signal corresponding to the timing to pin 103. The engine temperature sensor K36 , receives a reference earth from pin 85 of the control unit M10 and supplies a signal proportional to the temperature of the engine coolant to pin 84. The same sender unit also supplies information to the temperature gauge and warning light: pin 1 of connector A of E50 . The air flow meter K41 receives a general supply from the line for fuse B41 ; a reference voltage is received from pin 88 of M10 . It is supplied by the control unit from pin 97 of M10 , and sends to pin 89 a signal proportional to the air flow. K41 also contains an air temperature sensor which sends an air temperature signal to pin 86 of M10. 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 78 and 76 respectively of M10 and sends a corresponding signal to pin 77. The second receives power and earth from pins 81 and 79 respectively of M10 and sends a signal to pin 80. Fuel temperature sensor K81 fitted on the return manifold measures the temperature of diesel leaving the injectors. It receives a reference earth from pin 83 of M10 and sends the fuel temperature signal to pin 82. The turbocharging sensor K82 measures the turbocharger pressure. It is supplied by pin 93 of M10 and receives a reference earth from pin 95. The signal is sent to in 94 of the control unit. The fuel pressure sensor K83 is responsible for providing the injection control unit with a feedback signal for governing pressure and injection duration. It receives the power and reference earth from pins 90 and 92 of M10 ; it then sends the pressure signal to pin 91. The fuel pressure regulator N77 has the task of keeping the value of the fuel pressure in the accumulator constant. The two control signals come from pins 108 and 109 of the control unit M10 . The EGR solenoid L30 controls exhaust gas recirculation. It is supplied by the line for fuse B41 and is controlled by a signal for pin 16 of M10 . The variable geometry solenoid valve L36 regulates the operation of the turbine according to the engine load: it is supplied by the line for fuse B41 and is controlled by a signal for pin 17 of M10 . The solenoid valve on the throttle casing L62 shutters and closes the throttle, for example when the engine is switched off; it is supplied by the line for fuse B41 and is controlled by a signal for pin 15 of M10 . Pin 59 of M10 receives the signal coming from the brake lights switch I30 , with the supply controlled by the ignition (INT) from fuse F1 of the junction unit B1  See E2021  BRAKE LIGHTS . Pin 61 of M10 receives an earth signal coming from the clutch pedal switch I31 . The injectors N70 receive the opening go ahead supply from pins 117 (cylinders 1 and 2) and 118 (cylinders 3 and 4) of M10 . The engine control unit sends commands to the injectors N70 from pins 119, 120, 121 and 114 of connector A for cylinders 1, 2, 3 and 4, respectively. The control unit M10 is connected to the CODE control unit M20 via a specific serial line from pin 11; in this way if the CODE control unit does not detect a correct code, it does not issue enablement and the engine is not started.  See E7010  CODE . The control unit is equipped with a self-diagnostic unit that may be used by connecting the unit to connector R10 : this receives signals from pin 48 of control unit M10 through the tester line. The auto-diagnostic system also produces the signal for the 'injection failure' warning light (from September 2003, EOBD warning light), in the instrument E50, which comes from pin 21 of the control unit M10 and reaches pin 16 of connector C of E50. If the engine temperature is high, the control unit causes the relevant warning light in the instrument panel E50 to come on (signal from pin 110 of M10 to pin 8 of connector A of E50 ). A signal from pin 14 of M10 , on the other hand, lights up the 'heater plugs' warning light. The speedometer signal (vehicle speed) reaches pin 49 of control unit M10 .  See E4010  INSTRUMENT PANEL . The engine rpm signal, produced by the control unit M10, is sent to the panel by pin 47 of M10 See E4010  INSTRUMENT PANEL . The control unit M10 is connected to the air conditioning system through pins 18 and 60. This makes it possible to adjust the engine idle speed as the load increases each time the compressor is switched on or to switch off the compressor in the case of high engine speed or load cond

... DATA ERROR - CROPPED TEXT | Ошибка данных - Текст обрезан ...