Mercedes-Benz ML320. Service manual - part 388
Task
After engine start speed is reached, interrupt the circuit (circuit 50) M1 to the solenoid switch of the starter.
Design
The solenoid switch of the starter is operated not through the ignition/ start switch S2/1, but in drive position P
or N through the starter relay, by the engine control unit.
The voltage for the starter relay (coil) is supplied through circuit 87. The starter relay is actuated by the engine
control unit through GND.
Function
When the ignition/start switch is operated in the start position, the engine control unit activates an automatic
start control. Once the engine start speed of 400 to 700 rpm is reached, the engine control unit interrupts the
ground actuation to the starter relay and thus the engine start operation.
Once the engine start operation is initiated, shutting off circuit 50 at the ignition/start switch has no effect. The
starter rotates until the specified start speed is reached, or for about 5 seconds at an engine temperature of +80 °
C, for a maximum of 10 seconds if the engine is cold.
SAFETY PRECAUTIONS
SAFETY INFORMATION: ELECTRICAL SYSTEM - ENGINE - AS15.00-Z-9999ZZ
MODEL all
Motor electronics control unit,
location/task/ design/function
GF07.61-P-5000F
HFM-SFI control unit,
location/task/design/ function
GF07.51-P-4103D
Crankshaft position sensor,
location/task/ design/function
GF07.04-P-4116F
Start recognition function
Engine 104,, 111, 112,
113, 137 (via terminal 50)
GF07.13-P-3014G
Engine 119, 120 (via
engine speed signal)
GF07.13-P-3014F
ETC control unit, location/task Selector lever position
information P/N and
driving position engaged.
Transmission 722.6
GF27.19-P-4012G
Electronic ignition switch
control unit, location/
task/design/function
Model 202 as of 6/97, 208,
210 as of 3/97
GF80.57-P-4102A
Model 215, 220
GF80.57-P-4102S
Model 203, 209
GF80.57-P-4102PP
2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
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