1997 MERCEDES-BENZ ML430 fuel

Fig. 14: Identifying Signal Assignment - Shown On Engine 119
Function
When the crankshaft is rotating, an alternating voltage is generated in the crankshaft position sensor by the teeth
of the driven plate. In this case, each tooth generates an alternating voltage signal. No voltage is generated
through the gap of 2 missing teeth. The ME-SFI control unit detects the TDC position of the crankshaft with the
2nd negative slope after the gap.
If the signal from the camshaft Hall sensor is at 0 V ("low") at this moment, the ME control unit processes this
in order to detect ignition TDC. This, is used for actuating the ignition coils and the fuel injectors. The high
voltage is distributed rotorlessly. Advantages of the rotorless high voltage distribution are:
significantly reduced electromagnetic interference level (no naked sparks)
no rotating parts
reduction in noise
reduced high voltage connections.
1.Determine ignition angle according to input signals, actuate ignition coils and release ignition
spark.
The ME-SFI control unit essentially analyzes the following signals for determining the ignition angle:
EngineRecognition of TDC position of
cylinderIgnition TDC
1111 and 4Cylinder 1
104, 112, 113, 1191 and 6Cylinder 1
120, 137Right hand cylinder bank: 1 and 6Cylinder 1
Left cylinder bank: 7 and 12Cylinder 7

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 16 © 2006 Mitchell Repair Information Company, LLC.

Engine load
Crankshaft position sensor
Camshaft Hall sensor
Coolant temperature sensor
Intake air temperature sensor/charge air.
Coil ignition: The ME control unit interrupts at the point of ignition timing at the ground end the ignition
coil primary circuit of the ignition coil.
ECI ignition system (engine 137): The ME control unit actuates the output stages in the ECI ignition
modules.

The ignition angle can only be checked with the HHT/STAR DIAGNOSIS.
2.Ignition angle adaptation
2.1 Catalytic converter heating-up (warming-up)
The ignition angle is continuously retarded for about 20 seconds in order to more rapidly warm up the catalytic
converter to its operating temperature if:
coolant temperature at start > 15 °C and < 40 °C
Selector lever position P or N
At the same time idle speed is increased by the idle speed control.
2.2 Idle speed
To assist the idle speed control, the ignition angle can be retarded by as much as 36° crank angle or advanced by
as much as 20° crank angle.
Altering the ignition angle provides a more rapid control than altering the position of the throttle valve (idle
speed control).
2.3 Deceleration fuel shutoff
The ignition angle is briefly retarded when combustion is resumed (fuel injectors actuated) in order to prevent a
sudden increase in torque.
2.4 Intake air temperature/coolant temperature
The ignition angle is retarded under load, as a function of the intake air temperature and coolant temperature, in
order to prevent an
y knocking tendency at high intake air and coolant temperatures. The ignition angle is

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 17 © 2006 Mitchell Repair Information Company, LLC.

"Retarded" if:
Intake air temperature > 35 °C
Coolant temperature > 105 °C
In supercharged engines the charge air temperature is used as information for the ignition timing adjustment in
place of the intake air temperature.

The values of the retardation of the ignition angle of intake air temperature and coolant temperature are added
together.
2.5 Transmission overload protection
In order to protect the shift elements of the automatic transmission during power shifts (1-2-1, 2-3-2) from
excessive thermal stresses, the ignition angle is briefly retarded during the gearshift and the engine torque
reduced as a result. The ME-SFI control units are supplied with a signal for this purpose from the ETC control
unit (N15/3) over the CAN databus.
2.6 ESP/ASR control mode
In order to reduce the engine torque as rapidly as possible in the ESP/ ASR control mode, the ignition angle is
retarded by the throttle valve actuator (opening angle reduced) prior to the control mode being activated. The
information from the ESP/ASR control unit is supplied over the CAN databus to the ME-SFI control unit.
2.7 Anti-knock control (AKC)
If uncontrolled combustion (knocking) occurs at one or several cylinders, the ignition angle at the relevant
cylinder or cylinders is "Retarded".
2.8 Smooth engine running analysis
To restrain the three way catalytic converter from thermal overload through combustion misfiring and in order
to keep the exhaust emission values, the smooth operation of the engine is continuously monitored.
If combustion misfiring is identified at one or several cylinders, the corresponding fuel injection valves are no
longer actuated after a certain number of misfires.
Engine 104, 111, 112, 113, 119, 120: Smooth operation evaluation is performed through the signals of the
crankshaft position sensor.
Engine 137: Identification of combustion misfiring by means of ionic current signal, see ECI ignition system
function.
2.9 Double ignition engine 112,113,137

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 18 © 2006 Mitchell Repair Information Company, LLC.

location/design/function113, 119, 137
Engine 120GF30.20-P-3010F
Anti-knock control function GF15.12-P-4024F
Transmission overload protection
functionwith automatic
transmissionGF07.61-P-4026F
Overheating/pinging protection
function GF07.61-P-4027F
Intake air temperature correction
function GF07.61-P-4028F
ME-SFI synchronizing fuel
injection and firing order function GF07.61-P-4009F
ME-SFI ignition system signal
assignmentEngine 104GF15.12-P-0001-02D
Engine 111GF15.12-P-0001-02G
Engine 112GF15.12-P-0001-02A
Engine 113GF15.12-P-0001-02B
Engine 119GF15.12-P-0001-02E
Engine 120GF15.12-P-0001-02F
Engine 137GF15.12-P-0001-02L
ME engine speed signal function GF07.61-P-3017F
ASR V control unit
location/task/design/functionwith code 471a
Model 129, 140, 202 as
of 6/94, 170, 208, 210GF42.40-P-4500A
ESP control unit location / task /
functionwith code 472a
Model 129 with engines
104, 119, 120
Model 140
Model 210 with engine
119GF42.45-P-4500A
with code 472a
Model 129 with engine
112, 113
Model 163 up to 8/02,
168, 215
Model 220 (except
220.08/18)
Model 202, 208 with
engine 112, 113
Model 210 with engine
111, 112, 113GF42.45-P-4500B
with code 472a
Model 170 with engines
111, 112
Model 202, 208 with
Engine 111
Model 203GF42.45-P-4500C

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 20 © 2006 Mitchell Repair Information Company, LLC.

112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /95
ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /969
ENGINE 119.980 /981 /982 /985
ENGINE 120.982/983
ENGINE 137.970
Fig. 15: Identifying Anti
-Knock Control Components - Shown On Engine 119
Task
Ensuring knock-free operation of the engine with different fuels in all operating conditions from idling speed up
to maximum speed of engine, from an engine load of more than approx. 40%. For this purpose, if uncontrolled
combustion (knocking) occurs, the ignition angle at the relevant cylinder or cylinders is retarded.
Design/function
The anti-knock control (AKC) function is integrated in the ME-SFI control unit. The range of functions has
been enlarged compared to previous versions.
Input signals:
Engine speed (crankshaft position sensor)

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 22 © 2006 Mitchell Repair Information Company, LLC.

speed and temperature. The anti-knock control and the adaptation are deactivated and a fault is stored.
Automatic RON switch
In addition to the RON correction using the HHT, the anti-knock control features an automatic RON switch.
This detects a persistent high knocking tendency of the engine and assists the anti-knock control by means of an
appropriate pre-control.
This is done by analyzing the stored adaptation values, the ignition angles of all the cylinders and the number of
control interventions in certain engine load and speed ranges. Depending on the threshold which has been
exceeded, the RON value is adjusted by one or several stages. The value is retained until the engine is switched
off.
After engine start, only the RON correction which is carried out by means of the HHT/STAR DIAGNOSIS is at
first active.
KNOCK SENSORS, LOCATION - GF15.12-P-4101-01A
Crankshaft position sensor,
location/task/ design/function GF07.04-P-4116F
Camshaft Hall sensor,
location/task/design/ function GF07.04-P-4117F
Knock sensors,
location/task/design/function GF15.12-P-4101F
Coolant temperature sensor,
location/task/ design/functionEngine 119, 120GF07.04-P-5026F
Engine 104, 111GF07.04-P-5026G
Engine 112, 113, 137GF07.04-P-5026A
Hot film mass air flow sensor,
location/task/ design/functionEngine 119, 120 (round
connector)GF07.07-P-4118E
Engine 104, 111, 112,
113, 137GF07.07-P-4118G
Engine 111 EVOGF07.07-P-4118GS
Pedal value sensor,
location/task/design/ function GF30.20-P-4011L
ME-SFI control unit
position/task/design/ function GF07.61-P-5000F
Engine 111 EVOGF07.61-P-5000GS
ME-SFI synchronizing fuel
injection and firing order function GF07.61-P-4009F
Engine 111 EVOGF07.61-P-4009GS

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 24 © 2006 Mitchell Repair Information Company, LLC.

Fig. 22: Identifying Camshaft Hall Sensor - Shown On Engine 112 In Model 220
Position sensor
TEST ROTORLESS HIGH VOLTAGE DISTRIBUTION - AR15.10-P-3000WA
ENGINE 112.923 /943, 113.961 in MODEL 129
ME-SFI fuel injection and ignition system with engine diagnostic tester Datascope D 980
Fig. item etc.Work instructions
Camshaft Hall sensor to
cylinder head *BA15.10-P-1002-03A
B6/1Camshaft Hall sensor Replace O-ring.
NumberDesignationEngines
112.910/911/
912/913/914/
915/916/917/
920/921/922/
923/940/941/
942/943/944/
945/946/947/
949/951/953/
954/955/960/
961/970/972/
973/975/976Engines
113.940/941/
942/943/944/
948/960/961/
962/963/964/
965/966/967/
968/969/971/
980/981/982/
984/986/992/
993/995Engine
113.987/
988/990/
991
BA15.10-P-
1002-03ACamshaft Hall
sensor to
cylinder headNm888

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 33 © 2006 Mitchell Repair Information Company, LLC.

ENGINE 112.942, 113.942/965/981 in MODEL 163
ME-SFI fuel injection and ignition system with engine diagnostic tester Datascope D 980
ENGINE 112.910 /920, 113.944 in MODEL 202
ME-SFI fuel injection and ignition system with engine diagnostic tester Datascope D 980
ENGINE 112.940, 113.943 in MODEL 208
ME-SFI fuel injection and ignition system with engine diagnostic tester Datascope D 980
ENGINE 112.911 /921 /941, 113.940/980 in MODEL 210
ME-SFI fuel injection and ignition system with engine diagnostic tester Datascope D 980
ENGINE 112.922 /944, 113.941 /960 in MODEL 220
ME-SFI fuel injection and ignition system with engine diagnostic tester Datascope D 980
Risk of accident.
Accidents may result if the
vehicle starts off
unintentionally with the
engine running. Risk of
injury as working around
the engine during start-up
or while running may result
in contusions and burnsSecure vehicle to prevent
it from moving. Wear
closed and snug-fitting
work clothes. Do not
grasp hot or rotating parts.AS00.00-Z-0005-01A
Risk of death. Death may
result if contact is made
with parts carrying high
voltages.Do not touch parts
carrying high voltages.
Persons who wear
electronic implants (e.g.
heart pacemakers) must
not carry out work on the
ignition system.AS15.10-Z-0001-01A
1Remove air cleaner
2Remove trim panel of
cylinder head cover
3Test ignition circuits Datascope engine
diagnostic tester*WH58.30-Z-1003-13A
General information on
rotorless high voltage
distribution AH15.10-P-1002-01WA
General information on
testing rotorless high AH15.10-P-1003-01W

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 34 © 2006 Mitchell Repair Information Company, LLC.