Mercedes-Benz ML320. Service manual - part 552

 

  Index      Mercedes     Mercedes-Benz ML320 - service and repair manual 1997-2005 year

 

Search            copyright infringement  

 

 

 

 

 

 

 



 

 

Content   ..  550  551  552  553   ..

 

 

Mercedes-Benz ML320. Service manual - part 552

 

 

Fig. 313: Identifying 3-Pin MLK Plug 

Fig. 314: Identifying 4-Pin MLK Plug 

Fig. 315: Identifying 8-Pin MLK Coupling

 

2004 Mercedes-Benz ML350 

1998-2005 GENINFO Overall vehicle - 163 Chassis

  

me 

 

Fig. 316: Identifying 14-Pin MLK Plug 

ACTIVE SERVICE SYSTEM (ASSYST) OPERATING NOTES - GF00.20-P-0003-01A 

Displaying remaining distance, remaining time or service exceeded when vehicle stationary or when 
driving on driver request:
  

Wake-up instrument cluster.  

Start switch in position "2" or driving.  

Operate reset button for trip counter twice within 1 s: the current remaining distance, the current 
remaining time or the current service exceeded appears.  

Displaying oil level at driver request:  

After start switch in position "2", wait 10 s until "DISPLAY OIL LEVEL" text and oil can symbol (or oil 
can and clock symbol) appears.  

Press reset button for trip counter twice within 1 s: the message "OIL LEVEL OKAY" (or "O.K.") or the 
current missing oil quantity appears. If correct oil level measurement is not possible, the text "OBSERVE 
WAITING TIME" appears (or the clock symbol and the oil can symbol; the clock symbol flashes). 

 

Notes on replacement of 
safety-relevant and special 
components

Model 124, 126, 129, 
140, 163, 164, 168, 169, 
170, 171, 199, 202, 203, 
208, 209, 210, 211, 215, 
216, 219, 220, 221, 230, 
240, 245, 251, 414, 461 
as of 1.4.94, 463

AH00.19-P-1000-08A

 

Notes regarding plug 
connections

 

AH00.19-P-1000-06A

 

Remove contacts from 
mini laminated contact 
coupling

 

AR00.19-P-0120-26A

 

Remove contacts from 
mini laminated contact 
plug

 

AR00.19-P-0120-27A

 

2004 Mercedes-Benz ML350 

1998-2005 GENINFO Overall vehicle - 163 Chassis

  

me 

 

(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".  

Within the first 4 s after moving start switch into position "2": press reset button for trip counter twice 
within one second. The display for the service request is thus activated for 10 s.  

Within these 10 s move start switch into position "0". The service request continues to be displayed.  

Press reset button for trip counter and hold pressed .  

Move start switch into position "2".  

Continue to hold reset button for trip counter pressed (about 10 s) until the signal sounds and the new 
start distance appears in the display.  

BLOCK DIAGRAM OF ACTIVE SERVICE SYSTEM (ASSYST) - GF00.20-P-0003-03A 

Fig. 317: Block Diagram Of Active Service System (ASSYST) 

ACTIVE SERVICE SYSTEM (ASSYST) DISPLAY FACILITIES - GF00.20-P-0003-04A 

The table shows a number of possible types of displays of the active service system for different vehicles and 
different instrument clusters. 

(The display appears in the language set with the HHT under national code.) 

 

2004 Mercedes-Benz ML350 

1998-2005 GENINFO Overall vehicle - 163 Chassis

  

me 

 

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 

 

 

 

 

 

 

 

 

Content   ..  550  551  552  553   ..