1997 MERCEDES-BENZ ML320 engine

2. Changes to the standard condition may decisively influence the new vehicle warranty, since our warranty
obligation does not cover damage resulting from a change to the original Daimler Benz delivery
condition.
3. Proper supply of parts is no longer ensured when major components are replaced.
4. The exchange procedure is based on the "Identical unit exchange" principle. For example, an identical
model reconditioned unit will be supplied in return for a damaged engine. Only then is it possible to be
credited for the returned damaged engine.
Customer inquiries and requests of this type should be answered along these lines in order to ensure that the
quality standard of our vehicles is not impaired.
NOTES ON PERFORMANCE CORRECTION - AH00.10-P-2010-01A
Engine 104, 111, 112, 113, 119, 120, 137, 166, 601, 602, 603, 604, 605, 606
General
The weather station's barometer must be calibrated to the air pressure specified by the local meteorological
office.
The measured performance value must be corrected with correction factors.
There are two 2 correction factors:
Altitude correction factor
Performance correction factor
Performance correction formula N
eo = Ne x KH
Neo = Performance in reference to normal operating conditions in kW.
Ne = Performance measured on the output dynamometer in kW.
K
H = Correction for intake air temperature, barometer level and altitude of the relevant test location.
Calculation example
1. Read air pressure, altitude and intake air temperature of the test location off at the weather station. NOTE: In addition, vehicles registered in the Federal Republic of Germany are subject
to the law which revokes the operating permit as a result of conversions which
change the model. We cannot issue a Certificate of non-objection for individual
approval by the technical motor vehicle testing authority in each case.

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In the example:
Air pressure of the test location =955 hPa (mbar)
Altitude of the test location = 400 m
Intake air temperature of the test location =+20°C
2. Determine the performance on the output dynamometer =100 kW
3. In the altitude correction Table, the altitude value of the test location = 400 m, results in a height
correction factor of 46 hPa (mbar).
4. The air pressure of the test location minus the height correction factor results in an air pressure value (p)
of:
955 hPa (mbar) - 46 hPa (mbar) = 909 hPa (mbar)
In order to be able to insert the air pressure (p) into the Table, it must be rounded. In the example, to 910
hPa.
5. On the basis of the air pressure (p) = 910 hPa, we read a correction factor (KH) of 1.0787 off from the
performance correction Table with an intake air temperature (t) of 20°C.
6. The performance data in relation to normal operating conditions results in the following:
N
eo = Ne x KH
N
eo = 100 kW x 1.0787 = 108 kW
Output on the dynamometer: Ne = 100 kW
Air pressure value of the test location: P= 955 hPa (955 mbar)
Air-charge temperature of the test location: t =+20°C
Altitude of the test location: 400 m above sea level
Units: hPa = Hecto Pascal
1 hPa = 1 mbar
1 Pa = 0.01 mbar
CORRECTION TABLES FOR CALCULATING ACTUAL PERFORMANCE VALUE - AH00.10-P-2010-02A
Engine 104, 111, 112, 113, 119, 120, 137, 166, 601, 602, 603, 604, 605, 606

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In areas exposed to particularly high stresses (dampness, scouring), additional safety precautions may however
be required.
The following measures are recommended depending on the application.
Protect repair area using:
Heat-shrinkable tube
Corrugated tube
Wrapping with fabric tape
Spaghetti insulation
BASIC KNOWLEDGE
MODEL SURVEY - GF00.10-P-0025-01I
MAJOR ASSEMBLY OVERVIEW - GF00.10-P-0025-02I
COMPLETE VEHICLE, MODEL/COMPONENT INSTALLATION SURVEY, BUILD CONDITION - GF00.10-P-0801I
MODEL 163
163.1163.11163.113ML 270 CDI
163.12163.128ML 400 CDI
163.13163.136ML 230
163.15163.154ML 320
163.157ML 350
163.17163.172ML 430
163.174ML 55 AMG
163.175ML 500
Sales
designationModelEngineManual
transmissionAutomatic
transmissionSteering gear
ML 270 CDI163.113612.963716.644722.661-
ML400CDI163.128628.963-722.666
722.673-
ML 230163.136111.977717.461722.660-
ML 320163.154112.942-722.662-
ML 350163.157112.970-722.674-
ML 430163.172113.942-722.663-
ML 55 AMG163.174113.981-722.666-
ML 500163.175113.965-722.666-

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Fig. 318: Identifying Active Service System (ASSYST) Display
ACTIVE SERVICE SYSTEM (ASSYST) INFLUENCING PARAMETERS - GF00.20-P-0003-05A
The values of various influencing parameters are required by ASSYST for calculating the demand-based service
interval, and these are included in the calculation of the service interval as weighting factors . There are two
versions within ASSYST, the difference being in the oil level sensors fitted:
The familiar oil level indicator switch (S43) is fitted to engines (104, 111, 119, 120, 602.982, 604, 605,
606). In view of the fact that this is a switch, it is only possible to detect if the oil level drops below the
minimum level.
The oil sensor (oil level/temperature/quality, B40) is used on more recent engines (e.g. 112, 113, 166,
611, 668). This sensor consists of 2 capacitor systems with the engine oil as an insulator. If the water
content of the oil or the oil level changes, there is a change in the capacitance of the "capacitor".
The capacitance is thus a measure for the oil level.
In addition, the oil sensor (oil level/temperature/quality, B40) contains a temperature sensor which
detects the temperature of the engine oil.
All the signals are processed in the electronics integrated in the sensor to form a PWM (pulse width
modulated) signal, and passed to the engine control module (N3).
In addition to the weighting factors, which depend on reallife driving conditions, quality factors are also used
for calculating the demand-based service interval (remaining distance and remaining time).
Survey of ASSYST influencing parameters
Weighting factors (dependant on reallife driving conditions):
Load torque
Engine speed
Oil level
Engine oil temperature
Oil correction factor (is used as comparative value for determining oil level)
Coolant temperature
These data are supplied by the injection system control module (N3) to the service microprocessor over
the CAN.
The data relating to oil level, engine oil temperature and oil correction factor are supplied by the oil
sensor (oil level/temperature/quality, B40) through the injection system control module (N3), and are
therefore only available on engines fitted with this sensor.
Quality factors (these are factory-set to base values and can be changed with the HHT, if operating
conditions of the vehicle so necessitate; they influence the start distance):

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Engine version factor (gasoline/diesel)
National factor (The kilometer or mileage is coded in accordance with the national version.)
Distance travelled :
ASSYST is supplied with the 4 wheel speeds from the traction systems control module (N47) over the
CAN for calculating the distance travelled.
Time
ASSYST is supplied with the time information from the clock integrated in the instrument cluster.
ACTIVE SERVICE SYSTEM (ASSYST) SURVEY MODEL/ENGINE/SENSOR/INSTRUMENT CLUSTER - GF00.20-P-0003-
06A
The table below (status: March 1999) lists the various vehicle models with the different engines and the
different oil level sensors.
In addition, the table also indicates whether an instrument cluster with multifunction display is fitted.
ModelEngineOil level sensorMultifunction display
with engine
129112, 113
103, 104, 119, 120Oil sensor (oil
level/temperature/quality, B40)
Oil level indicator switch S43-
140-
104, 119, 120, 606Oil sensor (oil
level/temperature/quality, B40)
Oil level indicator switch S43-
163112, 113, 612
111Oil sensor (oil
level/temperature/quality, B40)
Oil level indicator switch S43-
168166, 668
-Oil sensor (oil
level/temperature/quality, B40)
Oil level indicator switch S43-
170112
111Oil sensor (oil
level/temperature/quality, B40)
Oil level indicator switch S43-
202112, 113, 611
104, 111, 601, 604,
605Oil sensor (oil
level/temperature/quality, B40)
Oil level indicator switch S43-
208112, 113
111Oil sensor (oil
level/temperature/quality, B40)
Oil level indicator switch S43Engine 112 only and
Gulf States: engine 111
210112, 113, 611
104, 111, 602, 605,
606Oil sensor (oil
level/temperature/quality, B40)Engines 112,113 Gulf
States, , : on all
engines fitted; others:

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ACTIVE SERVICE SYSTEM (ASSY ST) FUNCTION - GF00.20-P-0003A
MODEL 129 with ENGINE 112, 113
MODEL 163 with ENGINE 112, 113, 612
MODEL 168 with ENGINE 166, 668
MODEL 202 with ENGINE 112, 113, 611
MODEL 208 with ENGINE 112, 113
MODEL 210 with ENGINE 112, 113, 611, 612, 613
General
The "Active service system (ASSYST)" draws the attent ion of the driver to a service which is due.
ASSYST is a demand-activated engine oil service system. In other words, in addition to the pure time and
distance criterion, various factors are taken into account for calculating the demand-oriented service intervals.
These are on the one hand quality factors which are c oded with the HHT, and on the other hand weighting
factors which take into account driving conditions and thus actual wear and tear.
Fig. 319: Identifying Text Panel And Tool Symbol
engines 602, 606 for
in addition engine 605 LA

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After a level has dropped below a warning threshold, the remaining distance or the remaining time is displayed
in text panel (b) and the tool symbol (a) appears in the display (top ill.). In addition, ASSYST features a low
engine oil level display. If the oil level is too low or too high, this appears in text panel (b) and the oil can
symbol (a) is displayed (bottom ill.).
( The illustrations relate to models with multifunction display. For other models, refer to document:
"ASSYST display facilities".)
Service A/B display
All models will feature an automatic display of the service (A or B) by no later than modification year 00/1.
More detailed information is contained in the document displaying service.
Fig. 320: Identifying Service A/B Display

In view of the complexity of the system, ASSYST features its own processor in the instrument cluster.
ASSYST is supplied with the time information from the electronic clock integrated in the instrument cluster.
The other data required are supplied over the CAN dataline by the traction systems control module (N47) and
by the injection system control module (N3).
CAN data required for ASSYST:
wheel speed signals for calculating the vehicle speed and distance (from traction systems control module,
N47)
Coolant temperature (from injection system control module, N3)
Engine oil temperature (from injection system control module, N3)
Oil level (from injection system control module, N3)
Engine speed (from injection system control module, N3)
Load torque (from injection system control module, N3)
Oil correction factor (from injection system control module, N3)
Active service system (ASSYST) GF00.20-P-0003-03A

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ACTIVE SERVICE SYSTEM (ASSYST) FUNCTION DESCRIPTION CONTENTS - GF00.20-P-0997AZ
MODEL 129 as of 1.6.97
MODEL 140 as of 1.6.97
MODEL 163
MODEL 168
MODEL 170 as of 1.6.97
MODEL 202 as of 1.6.97
MODEL 208 up to 31.7.99
MODEL 210.081 /281 /025 /063 /065/225 /265 /663 up to 31.5.97
MODEL 210 as of 1.6.97 up to 30.6.99
block diagram
Active service system (ASSYST)
display facilities GF00.20-P-0003-04A
Active service system (ASSYST)
influencing variables GF00.20-P-0003-05A
Active service system (ASSYST)
survey of
model/engine/sensor/instrument
cluster GF00.20-P-0003-06A
Remaining distance function GF00.20-P-2007A
Remaining time function GF00.20-P-2008A
Engine oil monitor function GF00.20-P-2009A
Displaying service functionModel 129, 202 as of
8.99
Model 163 as of 1.00
Model 168 as of 9.99
Model 170 as of 12.99GF00.20-P-2010B
Active service system (ASSYST)
functionEngines with oil sensor
(e.g. 112, 113, 611)GF00.20-P-0003A
Model 210 as of
01.03.97 with engine
111, 602, 604, 605, 606
Model 129, 140, 170,
202 as of 06.97 except GF00.20-P-0003B

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