Starting System: Description and Operation

GF15.30-P-3000GZ Starter Control, Function

Starting the engine is only possible if the DIRECT SELECT gear selector switch (S16/13) is switched into position "P" or "N". The CDI control unit (N3/9) receives the message "P" or "N" via the Controller Area Network bus Class C (engine compartment) (CAN-C) from the intelligent servo module for DIRECT SELECT (A80) control unit. Also the CDI control unit receives the message "terminal 50 ON" over the CAN-C from the EIS [EZS] control unit (N73). he CDI control unit actuates the starter (M1) over the integral starter relay (F58kI) in the SAM control unit at the rear (N10/8).

The CDI control unit detects engine running via the crankshaft position sensor (B70) and the "tml. 61 ON" message, and the end of the starting procedure through the "tml. 50 OFF" message. The CDI control unit reacts by interrupting actuation of the starter.

If there is a repeat start after the end of starting procedure, a cut-off period of about 1.5 to 3 seconds is applied. This occurs so that the rotating pinion of the starter is prevented from meshing with the toothing on the engine clutch plate (ring gear protection).