Active Service System (ASSYST) function - GF00.20-P-0003R: Notes
MODEL 230
General
With the "Active Service System" (ASSYST) , the driver's attention is drawn to a service which is due. In addition, the necessary scope of the service is determined and displayed. ASSYST is an engine oil maintenance system that monitors engine oil requirements . This means that, in addition to a pure time and distance criterion, various factors are taken into consideration in order to calculate the service intervals.
On the one hand, this includes quality factors , which are coded with Star diagnosis and, on the other hand, evaluation factors , which take driving conditions, and therefore actual wear, into consideration.
The service interval in the case of favorable evaluation (few cold starts, driving predominantly in the mean speed range) is longer than in the case of unfavorable evaluation.
Display
Display is carried out with the multifunction display on the left (A1p13) and right (A1p15) of the instrument cluster (A1).
The service interval is displayed when requested by the driver or, in the event of negative deviation from a warning threshold , automatically as a remaining distance or remaining time in the text field (3) of the right multifunction display (A1p15). The service symbol additionally appears in the left multifunction display (A1p13) (Figure 1).
Engine oil monitoring
In the event of a low oil level or overfilling, information regarding the oil level is blended into the text field (3) in the right multifunction display (A1p15) (Figure 2). The oil can symbol additionally appears in the left multifunction display (A1p13).
Oil top-ups can additionally be detected by the system. If oil is topped up, a quantity rebate, which may extend the service interval, is assigned.
Depending on evaluation and quantity rebate, the service interval is 15, 000 to 30, 000 kilometers, or 10, 000 to 20, 000 miles.
Technology and variables
In order to determine the monitored service interval, ASSYST requires the values of various variables. These serve to calculate the service interval.
In addition to the evaluation factors , which depend on the real-life driving conditions, quality factors are also used to determine the monitored service interval (remaining distance and remaining time).
Influencing variables
- Evaluation factors
(dependent on the real-life driving conditions) :
- Load moment
- Engine speed
- Oil level
- Engine oil temperature
- Oil correction factor (serves as a comparative value for determining the oil level)
- Coolant temperature
The instrument cluster (A1) receives this information via the engine compartment CAN from the fuel injection system control module (N3).
For the oil level, engine oil temperature and oil correction factor data, the ME-SFI control module (N3/10) reads in the data from the oil sensor (oil level, temperature and quality B40) .
- Quality factors
(these are preset to basic values in the factory, and can be changed with Star diagnosis, if the operating conditions necessitate this; these influence the startup distance):
- Engine variant factor (gasoline/diesel)
- Country of usage factor (the mileage is coded according to the country specification.)
- Travel distance:
In order to calculate the travel distance, ASSYST receives the signals from the four wheel speed sensors via the engine compartment CAN from the SBC control module (A7/3n1) and the ESP, SPS and BAS control module (N47-5).
- Time
ASSYST is provided with time information from a timer which is integrated into the instrument cluster (A1).
Example of service display
Further displays can be found in other documents, especially in the document: "Active Service System (ASSYST) Mercedes-Benz Driver Information Service".
Example of engine oil display
Further displays can be found in other documents especially in the document: "Active Service System (ASSYST) Mercedes-Benz Driver Information Service".
Diagnosis
ASSYST diagnosis is carried out with Star diagnosis . In this case, access is achieved via the instrument cluster (A1) . During diagnosis, the control module for fuel injection systems (N3) must also be taken into consideration.
Inadvertently activated oil change reset
If an oil change reset has been activated on the instrument cluster (A1) or with the star diagnostic tool, but no oil change has to be carried out, this oil change reset must be immediately reset. A corresponding menu is available in Star diagnosis for this purpose.
Replacement of the instrument cluster (A1)
If the instrument cluster (A1) has to be replaced, the codes and data records must be transferred into the new instrument cluster. See the menu assistance in Star diagnosis.
Replacement of the oil sensor (oil level, temperature and quality B40)
In the event of complaint following the replacement of the oil sensor (oil level, temperature and quality B40) the minimum oil level warning may possibly have to be adjusted (calibrated). This must always be carried out if the message "CHECK ENGINE OIL LEVEL!" appears, but the oil level is still OK according to the oil dipstick. Adjustment is carried out via menu assistance with Star diagnosis.
| Active Service System (ASSYST) component networking | GF00.20-P-0003-07R | ||
| Display service function | GF00.20-P-2010R | ||
| Remaining distance function | GF00.20-P-2007R | ||
| Remaining time function | GF00.20-P-2008R | ||
| Engine oil monitoring function | GF00.20-P-2009R | ||
| Oil sensor location/task/design/function | GF18.40-P-4111A | ||
| Active Service System (ASSYST) operating instructions | GF00.20-P-0003-01R | ||
| Active Service System (ASSYST) Mercedes- Benz Driver Information Service | GF00.20-P-0003-02R | ||
| Table of contents, function description, instrument cluster | GF54.30-P-0997R |