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 8 of connector A) via fuse F18 of engine bay junction unit B001. See E1010 SUPPLYAn ignition-operated supply (15/54) is received at pin 58 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 13 of connector A of engine control unit M010 and then forwards a power supply:
to pins 4 and 5 of connector A of the control unit via lines protected by fuse F17 and fuse F22 of B001 respectively;
to air flow meter K041, to water in diesel filter sensor K031, to glow plug preheating control unit M015, to wastegate L037, to EGR valve L030, to throttle body solenoid L062 and to the coil of heated diesel filter relay R19 inside engine bay control unit B001;
Heated diesel filter relay R19 is supplied from the battery via a line protected by fuse F20 of engine bay control unit; this is excited by an earth signal from pin 23 of connector A of M010 and controls the operation of diesel heating coil O020: the thermal contact inside the coil is connected to pins 82 and 83 of B of engine control unit M010. It deactivates the system once the diesel is warm enough.Fuel pump relay R10 inside junction unit B001, whose coil is excited by an earth signal from engine control unit M010 (pin 24 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 M015 that manages preheating of glow plugs A040 is supplied directly from the battery via a line protected by fuse F1 of control unit B001. This receives preheating commands (connector A) form pins 22 and 62 of connector A of control unit M010. The power supply to the five glow plugs A040 leaves from connector C of M015.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 99 and 100 of connector B: hese two signals are very low intensity and are thus appropriately shielded.Timing sensor K047 is supplied from pin 103 of connector B of control unit M010 and receives a reference earth from pin 102 of connector B; this sensor in turn sends the control unit a frequency signal corresponding to phase (pin 104 of connector B).Engine coolant sensor K045 receives a reference earth from pin 85 of connector B of control unit M010 and sends a signal proportional to engine coolant temperature to pin 84 of connector B of the control unit.Air flow meter (debimeter) K041 receives a reference voltage from pin 97 of connector B of engine management unit M010 and sends a signal proportional to air flow to pin 89 of connector B. K041 also contains an air temperature sensor: a reference earth is provided by pin 88 of connector B of M010, while pin 86 of connector B receives an air temperature signal.Engine management unit M010 controls the opening of individual injectors N070, via appropriate signals (duty-cycle type) sent from pins 119 (cyl.A), 120 (cyl.B), 121 (cyl.C), 114 (cyl.D), 115 (cyl.E) of connector B.Injectors N070 receive an enabling supply from pin 117 of control unit M010 (cyl.A and B) and from pin 118 (cyl.C,D and E) of connector B.Turbocharging sensor K082 measures turbocharging pressure. This is supplied by and receives a reference earth from pins 93 and 95 of connector B of M010, and sends a signal to pin 94 of the connector.The engine control unit receives a signal from water in fuel filter sensor K031 at pin 105 of connector B.Fuel pressure regulator N077 maintains fuel pressure constant in the accumulator. The two control signals come from pins 108 and 109 of connector B of control unit M010.Fuel pressure sensor 083 is responsible for sending the engine control unit a feedback signal to regulate injection pressure and duration. This receives a supply and reference earth from pins 90 and 91 of connector B of M010, and sends its own signal to pin 92 of the same connector.Linear sensor K120 is connected to control unit M010 at pins 40 e 74 of connector A for power supply and earth and pin 75 for transmission of its own signal.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 78 and 76 of connector A and sends a correspondong signal to pin 77 of the same connector of M010. The latter receives power and earth signals from pins 81 and 79 of connector A of M010 and sends a corresponding signal to pin 80 of the same connector.Throttle body solenoid L062 sends a signal to pin 15 of connector A of engine control unit M010 to ensure the throttle is correctly controlled.Waste-gate L037 determines turbine air pressure values according to accelerator pedal pressure; engine control unit M010 is connected to the solenoid from pin 17 of connector A.Solenoid EGR L030 controls exhaust gas recirculation. This is connected to the engine control unit at pin 16 of connector A.Pin 59 of connector A of the engine management unit receives a signal from brake light switch (normally open) I030, while pin 54 receives a signal from the normally closed switch See E2021 BRAKE LIGHTSPin 61 of connector A of M010 receives an earth signal via a contact on clutch pedal switch I031.The engine control unit receives a signal from low engine oil pressure switch K030 at pin 98 of connector B.Control unit M010 is then connected via the C-CAN network (pins 9 and 10 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, water in diesel filter, glow plug preheating, EOBD engine control system faults and engine oil pressure. See E4010 INSTRUMENT PANELIt also receives a speedometer signal generated by M051 (pins 1 and 2) via the C-CAN network (pins 28 and 29 of connector A).The control unit self-diagnosis system M010 also generates a signal (pin 21 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.