1997 MERCEDES-BENZ ML320 Complete Repair Manual

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Page 2841 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual (The texts in parentheses relate to vehicles without multifunction display.)
Resetting ASSYST after oil change (oil change reset) at instrument cluster:
Move start switch into position "2".

Page 2842 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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 AS

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):

2004 Mercedes-Benz ML350
1998-2005 GENINFO Overall vehicle - 163 Chassis
me
Saturday, October 02, 2010 3:47:47 PMPage 197 © 2006 Mitchell Repair Information Company, LLC.

Page 2843 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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 wh

Page 2844 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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, 11

Page 2845 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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

Page 2846 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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.

Page 2847 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual engine 112, 113, 611,
612
(Valid for engines with
oil level switch.)
Active service system (ASSYST)
operating informationEngines with oil sensor
(e.g. 112, 113, 611)GF00.20-P-0003-01A
Model 210

Page 2848 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual REMAINING DISTANCE FUNCTION - GF00.20-P-2007A
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
MODE

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