44
Engine, Mechanics
Explanatory notes on internal control unit
sequence chart
Request for starting (terminal 50 ON from
entry and start authorisation control unit
J518) energises the two relays. Locking-in
takes place during the initialisation phase of
engine control unit J623.
After initialisation, the engine control unit
assumes further starter control tasks as described
under item 3.
SSP282_064
Starting Engine running
Ignition on
Term. 15
Start request from
driver authorisation
system
Engine start
recognition
(engine speed)
Relay deenergisation by
engine control unit
Term. 50R/diagnosis
Engine control unit
initialisation
Engine control unit active
Start request retained manually
Start request briefly activated
Engine speed increases
Relay deenergisation
Starter speed
Starter operation feedback signal
Locking-in
Engine control unit active
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