Starter control, function - GF15.30-P-3000AMG

ENGINE 156.980 in MODEL 164, 251 up to Model Year 8

ENGINE 156.982 in MODEL 209

ENGINE 156.983 in MODEL 211, 219

ENGINE 156.984 in MODEL 216, 221 up to Model Year 8

Fig 1: Identifying Starter Control CAN Communication Diagram

Courtesy of MERCEDES-BENZ USA

The starter control which is integrated in the ME control unit takes over the actuation of the starter and the deactivation of the starter after reaching the engine starting speed.

Starting prerequisites

Actuation of the starter only takes place for "start enable" (drive authorization) from EIS [EZS] control unit and by recognition of engaged drive position "P" or "N" by the electronic selector lever module control unit (for model 209, 211, 219) or by the intelligent servo module for DIRECT SELECT (for model 164, 216, 221, 251).

Starting

Through actuation of ignition in the start position, the ME control unit receives the "tml. 50 signal" from the EIS control unit via the CAN data bus. Start control is carried out automatically by the ME control unit (touch start). It actuates the starter relay with a ground signal. The power contact on the starter relay closes and the starter solenoid switch is supplied at "terminal 50" with voltage from "terminal 15 unfused".

Ending start

When reaching an engine starting speed of 400 up to 700 rpm and a starting time of approx. 5 to 40 seconds (dependent on the coolant temperature), the ME control unit interrupts the negative activation to the starter relay and therefore ends the starting procedure.

Once the start operation is initiated, switching off "Terminal 50" (ignition/starter switch) has no further influence on the starting procedure.

Component description for the coolant temperature sensor, component description	B11/4	GF07.04-P-6040AMG
Component description for the crankshaft Hall sensor	B70	GF07.04-P-6220AMG
Component description for the ME-SFI [ME] control unit	N3/10	GF07.61-P-6000AMG