1997 MERCEDES-BENZ ML350 sensor

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. 16: Identifying Knock Sensors - Engine 112
KNOCK SENSORS, LOCA TION - GF15.12-P-4101-01B
Fig. 17: Identifying Knock Sensors - Engine 113
KNOCK SENSORS, FUNCTION - GF15.12-P-4101-02KE

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 25 © 2006 Mitchell Repair Information Company, LLC.

Fig. 18: Identifying Knock Sensors Oscilloscope Signals
Any vibrations which occur are converted with the aid of the piezo ceramic into electrical signals.
Piezo-electric effect: If a mechanical force acts on a crystal, electrical voltages are produced.

Knock sensor signals may also indicate engine damage, e.g. increased engine noise resulting from a widened
piston groove.
KNOCK SENSORS, LOCATION/TASK/DESIGN/FUNCTION - GF15.12-P-4101F
ENGINE 104.941 /942 /943 /944 /945 /991 /992 /994 /995
ENGINE 111.921 /943 /944 /945 /946 /947 /960 /961 /970 /973 /974 /975 /977
ENGINE 111.942 as of 1.6.96
ENGINE 111.951 /952 /955 /956 /957 /958 /982 /983
ENGINE 119.980 /981 /982 /985
ENGINE 120.982/983
ENGINE

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
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Saturday, October 02, 2010 3:18:54 PMPage 26 © 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 /968 /969
ENGINE 166.940 /960 /990 /995
Fig. 19: Identifying Knock Sensors

STARTER CONTROL, FUNCTION - GF15.30-P-3000GA
ENGINE 111.921 /942 as of 1.9.98,
111.943 /944 /946 /947 /973 with CODE (423a) 5-speed automatic transmission (new-generation)
ENGINE 111.945
in MODEL 208.335 /435 as of 1.6.98,
Knock sensors, locationEngine 104GF15.12-P-4101-01D
Engine 111GF15.12-P-4101-01G
Engine 112GF15.12-P-4101-01A
Engine 113GF15.12-P-4101-01B
Engine 119GF15.12-P-4101-01E
Engine 120GF15.12-P-4101-01F
Engine 166GF15.12-P-4101-01GC
Knock sensors, taskThe knock sensor detects
vibrations at the crankcase.
Knock sensors, designThe knock sensor is a self-
contained system. Inside
the sensor are piezo
crystals. The screened
cable is fitted directly onto
the knock sensor.
Knock sensors, function GF15.12-P-4101-02KE

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 27 © 2006 Mitchell Repair Information Company, LLC.

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 functionEngine 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/taskSelector lever position
information P/N and
driving position engaged.
Transmission 722.6GF27.19-P-4012G
Electronic ignition switch
control unit, location/
task/design/functionModel 202 as of 6/97, 208,
210 as of 3/97GF80.57-P-4102A
Model 215, 220GF80.57-P-4102S
Model 203, 209GF80.57-P-4102PP

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 29 © 2006 Mitchell Repair Information Company, LLC.

RISK OF DEATH CAUSED BY CONTACT WITH PARTS CONDUCTING HIGH VOLTAGES. - AS15.10-Z-0001-01A
Do not touch parts which conduct high voltages. Persons who wear electronic implants (e.g. heart
pacemakers) must not carry out work on the ignition system
Risk of death caused by high voltages in the ignition system
Electronic ignition systems operate within a hazardous power range both on the low voltage side (primary
circuit) as well as on the high voltage side (secondary circuit). Contacts with such parts can result in burns,
heart flutter or cardiac arrest.
Fig. 21: High Voltage Warning

Safety instructions/precautions
Persons with heart pacemakers must not perform any work on the ignition system.
Switch ignition off before commencing any work on the ignition system.
Do not touch or dismantle components of ignition system when working on running or rotating engine
with cranking speed.
Wear safety shoes (with rubber soles).
Detach the crankshaft position sensor connection either at the control unit or at the position sensor.
Do not install any electrically conducting, un-insulated adapters or installation sensors into the ignition
cable.
Risk of death caused by
coming into contact with
high-voltage parts although
ignition is turned off.ENGINE 137 ENGINE
275 ENGINE 285AS15.15-Z-0001-01A
Risk of death caused by
contact with parts
conducting high voltages.ENGINE 103, 104, 111,
112, 113, 119, 120, 122,
132, 134, 135, 137, 155,
156, 160, 166, 266, 271,
272, 273, 275, 285, 613,
628, 629, 642, 646, 648,
902, 906...AS15.10-Z-0001-01A

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 30 © 2006 Mitchell Repair Information Company, LLC.

Parts ordering notes
TESTING & REPAIR
TESTING AND REPAIR WORK: PASSENGER CARS: ELECTRICAL SYSTEM - ENGINE - AR15.00-Z-9163AA
MODEL 163
REMOVE, INSTALL CAMSHAFT HALL SENSOR - AR15.10-P-2000A
ENGINE 112.945 in MODEL 463.209 /232 /233 /244 /245 /250
ENGINE 112 in MODEL 129, 163, 170, 202, 203, 208, 209.361 /365/461 /465, 210,
211.061 /261 /065 /265 /080 /082 /280 /282, 220, 230.467
ENGINE 113 (except 113.990/991) in MODEL 129, 163, 202, 208, 209.375/475/376/476, 210,
211.070 /270 /083 /283, 215, 220, 230.472 /474 /475
ENGINE 113.962 in MODEL 463.206 /240 /241 /247 /248 /249 /254
ENGINE 113.982 in MODEL 463.243/246
quantity of paste is not
applied because this can
interfere with the signal
pickup of position sensor
L5
3 Install starter.
Part no.DesignationQuantity
000 989 76 51Paste (1 kg)1
Servicing wiring harnessMODEL 124, 126, 129,
140, 163, 168, 170, 201,
202, 208, 210, 215, 220AR15.18-P-0500A

2001 Mercedes-Benz ML320
1998-2005 ENGINE Electrical System - Engine - 163 Chassis
me
Saturday, October 02, 2010 3:18:54 PMPage 32 © 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.