3315714 - E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT - Functional description

Functional description

Engine control unit M10 monitors and controls the UNIJET electronic injection system. Engine control unit M10 is supplied when the ignition is turned on (INT/A) at pin 13 of connector B from a line protected by fuse F16 from junction unit B1. Relay J10 governs supply to the system: it is supplied by the battery via a line protected by maxifuse B80 . Pin 46 of connector C of control unit M10 sends an enablement signal that excites relay J10 and sends power to the control unit, to pins 7, 8 and 1 of connector A; the line supplying power to pin 1 is also protected by shunt fuse B35 . Relay J15 is also supplied by the battery via a line protected by maxifuse B80 : from pins 30 and 52 of connector C of control unit M10 send signals that excite relay J15 , which supplies - via a line protected by fuse F3 of junction unit B1 - power to fuel pump N40 , which is earthed through inertia switch I50 . In case of impact, this cuts off the circuit to prevent the danger of fuel delivery. Diesel preheating relay J17 is supplied directly via a line protected by fuse B39 and excited by a recharging signal from the alternator. Under these conditions (i.e. engine running with alternator recharging) it controls the operation of diesel heating coil O20 , connector B: the thermal contact (connector A of O20 ) deactivates the system when it has heated sufficiently. Control unit M15 , responsible for controlling preheating of heater plugs A40 , is supplied directly by the battery via a line protected by fuse F37 . It receives controls from pins 38 and 51 of connector C of M10 and sends a feedback signal to pin 1 of connector B of the control unit. Pins 4, 5 and 6 of connector A 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 supplies information on engine speed via a frequency signal sent to pin 26 of connector D of control unit M10 . It receives an earth signal from pin 37 of control unit connector D. Both signals are weak and are therefore shielded. Timing sensor K47 is supplied from pin 12 of connector D of control unit M10 . It receives a reference earth from pin 2 of connector D of control unit M10 and sends it a signal of frequency corresponding to the timing of pin 3 of the same connector. Engine temperature sender unit K36 receives a reference earth from pin 27 of connector D of control unit M10 and supplies a signal proportional to coolant temperature to pin 36 of the same connector. Air flow meter K41 receives a general power supply from pin 11 of control unit connector D and a reference voltage from control unit pin 1. It sends pin 14 of connector D a signal proportional to air flow. K41 also contains an air temperature sensor: the sensor reference earth is supplied by pin 4 of connector D of M10, while an air temperature signal is received by pin 23 of connector A. 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 5 and 23 respectively of connector C of M10 and sends a corresponding signal to pin 10 of the same connector. The second receives power and earth from pins 21 and 8 respectively of connector C of M10 and sends a corresponding signal to pin 9 of connector C. Fuel temperature sensor K81 fitted on the return manifold measures the temperature of diesel leaving the injectors. It receives a reference earth from pin 1 of connector C of M10 and sends a fuel temperature signal to pin 24. The turbocharging sensor K82 records turbo pressure. It is supplied from pin 8 of conector D of M10 and receives a reference earth from control unt pin 7. The signal is sent to pin 6 of control unit connector D. 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 13 and 34 respectively of connector

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