3315694 - E5010 STARTING AND RECHARING - Functional description (Right hand drive)

Functional description

Engine start-up via starter motor A20 is controlled by start-up enablement relay J5. The relay is supplied from the battery via terminal unit A5 and start-up enablement MAXIFUSE B9. Ignition switch H1 receives battery power via the line of maxifuse ACC of B5 . The connections for the automatic transmission and manual gearbox versions differ: on the former, when the ignition key H1 is turned to the extreme position (AVV), if all the safety conditions have been observed, the relay J5 is energized, via the diode M11 , which supplies the starter motor A20 electro-magnet winding (pin 50). on the second version, on the other hand, when the ignition key H1 is turned to the extreme position (AVV), the relay J5 is energized directly and supplies the starter motor. On versions with automatic transmission, the safety conditions are managed by the engine management control unit M10 which interfaces with the gearbox sensor unit D79 and the control unit M55 (see E7050 AUTOMATIC TRANSMISSION). When the safety conditions are satisfied, the control unit M10 sends the earth signal to the coil for connector J5 via pin 5 of connector A. Pin 30 of A20 , the actual starter motor, is supplied with voltage directly from the battery via terminal unit A5 . A start-up signal - pin 50 of H1 is also directed to instrument panel E50 - pin 13 of connector A - whose internal software uses the information to set the system to 'engine running' status. (see E4010 INSTRUMENT PANEL) The start-up signal also reaches relay R1 , which supplies numerous ignition-operated lines (INT/A).(see also E1010 FUEL SYSTEM). The direct current generated by the alternator A10 (pin B+) is sent to the battery A1 through motor A20 . When the alternator is not turning, i.e. not charging the battery, an earth signal is sent from pin D+ to instrument panel E50 - pin 7 of connector A. Instrument panel E50 ingition-operated power supply (INT/A) passes through fuse F1 of junction unit B1 to pin 15 of connector A. With the engine switched off but the panel on (INT/A), the recharging warning light in the panel E50 is on because there is an earth signal at pin D+ of the alternator A10 . When the engine has been started up and the alternator is carrying out its recharging function, the warning light goes out because pin D+ has a +12V signal.