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

ENGINE 272.9 (except 272.974) in MODEL 221.0 /1 (except 221.095 /195) as of model year 2009 /AEJ 08 

ENGINE 273.9 in MODEL 216.3, 221.0 /1 as of model year 2009 / AEJ 08 

Function requirements for starter control, general points 

• Circuit 87M ON (engine control ON)
• Engine OFF
• Drive authorization system 3 (DAS 3) start enable
• Engaged gear range "P" or "N"

Starter control, general points 

Starter control which is integrated in the ME-SFI [ME] control unit (N3/10) takes over actuation and shutoff of the starter (M1). For the starter control, the ME-SFI [ME] control unit reads the following sensors and signals:

• Coolant temperature sensor (B11/4)
• Crankshaft Hall sensor (B70), engine speed
• EIS control unit (N73), circuit 50 signal via the chassis CAN (CAN E)
• Electric controller unit (VGS) (Y3/8), gear range via the drive train CAN (CAN C)

Starter control function sequence 

The function sequence is subdivided into the following steps:

• Start function sequence 
• End of start function sequence 

Start function sequence 

The ME-SFI [ME] control unit receives the "circuit 50 signal" from the EIS [EZS] control unit via the chassis CAN by actuating the transmitter key (A8/1) in the start position.

This control unit actuates the circuit 50 starter relay (N10/1kH) with a ground signal. The power contact on the starter relay closes and the starter solenoid switch is supplied at "circuit 50" with voltage from "circuit 30".

End of start function sequence 

Start control is carried out automatically by the ME-SFI [ME] control unit (touch start). This means that if the start process is initiated switching off of "circuit 50" has no further influence on the start process.

When engine cranking speed has reached 400 to 700 RPM, or after a starting time of 5 to 40 s (depending on coolant temperature), the ME-SFI [ME] control unit interrupts the negative activation of the circuit 50 starter relay and thus terminates the start sequence.

The start sequence can only be aborted by switching off the ignition.

	Electrical function schematic for starter control	Model 216		PE15.30-P-2051-97CAB
		Model 221		PE15.30-P-2051-97SAB
	Component description for ME-SFI [ME] control unit	N3/10	Engine 272	GF07.61-P-6000MIS
		N3/10	Engine 273	GF07.61-P-6000MLS