3239454 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - Functional description (Smart gearbox)

Functional description

The engine control unit M10 monitors and controls the entire electronic ignition and injection system. The system is supplied directly by the battery via a line protected by the maxifuse EFI located on the battery, connector B99 C . The supply controlled by the ignition (15/54) arrives from the line protected by fuse F4 of the additional fuse box B98 A . The control unit M10 is supplied directly by the battery at pin 15 of connector A, via a line protected by fuse F5 of the additional fuse box B98 A . The supply controlled by the ignition reaches pin 47 of connector A, via a line protected by fuse F4 of the additional fuse box B98 A .

Main injection relay J10 controls the entire system: this is excited by a control signal (earth) received from pin 31 of connector A of control unit M10 and then sends power:

• to pins 16, 32 and 48 of connector A of the control unit, through the line protected by fuse F2 of the additional fuse box B98 A .
• to air flow meter K41 , to fuel vapour recovery solenoid L10 , to variable geometry control solenoid L15 , to variable valve timing actuator N76 and lambda probe K40 ; (all these lines are protected by fuse F2 of B98 A ).
• to the fuel injectors N70 , via the line protected by the fuse F3 , located in the unit B98 A ;

the fuel pump relay J15 receives a supply controlled by the ignition via fuse F4 , of the additional fuse box B98 A . It is excited by a control signal (earth) from pin 30 of connector A of control unit M10 and supplies power to fuel pump N40 , which is earthed through the inertia switch I50 , which cuts off the circuit in the case of a crash and so prevents the dangerous spilling of fuel. It also supplies power to the ignition coils A30 . The engine control unit M10 receives signals from the various sensors in order to monitor all engine operating parameters. Rpm sensor K46 provides information on engine speed via a frequency signal sent to pins 10 and 59 of connector B of control unit M10 . These two signals are very low intensity and are therefore shielded. Timing sensor K47 is supplied from pin 51 of connector B of control unit M10 , receives a reference earth from pin 26 of connector B and sends a signal of frequency corresponding to the timing to pin 42 of control unit connector B. Engine temperature sender unit K36 riceives a reference earth from pin 26 of connector B of control unit M10 and supplies a signal proportional to the coolant temperature to pin 25 of control unit connector B. The same sender unit also supplies information to the temperature gauge and warning light (    

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