Engine oil monitoring function - GF00.20-P-2009R
MODEL 230
General
The oil level is constantly monitored by the oil sensor (oil level, temperature and quality, B40), and the corresponding data are passed on to the ASSYST computer.
Oil top-ups are automatically detected, and result in a quantity rebate, which correspondingly extends the service interval. Excessive oil levels or low oil levels are displayed in the right multifunction display (A1p15) of the instrument cluster (A1).
Also see document "Mercedes-Benz Driver Information Service"
Oil warnings are displayed:
- automatically, but 60 s after starting the engine at the earliest, and with an oil temperature greater than 60°C:
- in the event of excessive oil levels : The oil can symbol appears in the left multifunction display (A1p13), and the display "REDUCE ENGINE OIL LEVEL! " in the right multifunction display (A1p15). A brief warning tone is additionally sounded.
- in the event of critically low oil levels or poor oil condition (water in the oil): The oil can symbol appears in the left multifunction display (A1p13) and the display "ENGINE OIL LOCATE WORKSHOP!" in the right multifunction display (A1p15). A brief warning tone is additionally sounded.
- in the event of minimum oil level: The oil can symbol appears in the left multifunction display (A1p13) and the display "CHECK ENGINE OIL LEVEL!" in the right multifunction display (A1p15). A brief warning tone is additionally sounded.
- automatically, 5 s after ignition ON:
- if the oil level has fallen to a level which is harmful to the engine: The oil can symbol appears in the left multifunction display (A1p13) and in red characters, the display "ENGINE OIL LEVEL STOP; ENGINE OFF!" in the right multifunction display (A1p15). In addition, a warning tone is sounded.
Display of the oil quantity
- Turn ignition-and-starter switch to position "2"
- Press the system selection pushbutton (S110s3) until the left multifunction display (A1p13) shows the default image (total and trip recorder). (Only necessary if the default image is not yet displayed.)
- Actuate the forwards and reverse scrolling pushbuttons (S110s1) until the message "CORRECT MEASUREMENT ONLY WHEN VEHICLE IS PARKED ON THE LEVEL" appears in the right multifunction display (A1p15).
- If the vehicle is not level , abort the measurement via further actuation of the forwards and reverse scrolling buttons (S110S1) within 3 s.
- If the measurement is not aborted, the message "ENGINE OIL LEVEL MEASUREMENT ONGOING" appears in the right multifunction display (A1p15) after approx. 3 s.
- The following messages may now appear in the right multifunction display (A1p15):
- "ENGINE OIL LEVEL OK"
- "ENGINE OIL LEVEL, REDUCE OIL LEVEL"
- "ENGINE OIL LEVEL FILL IN 1.0 L"
- "ENGINE OIL LEVEL FILL IN 1.5 L"
- "ENGINE OIL LEVEL FILL IN 2.0 L"
The quantity of oil which is to be filled in is specified in liters (L) or in quarts (Q).
- If the "COMPLY WITH WAITING TIME!" message appears, the waiting time has not been complied with.
The missing quantity of oil which is displayed is no longer changed during the display. A change in the oil level cannot therefore be directly observed in the display. The new oil level is only displayed following the conditions described in the following.
Waiting time
Measuring the oil level is only possible following the expiry of a waiting time following engine OFF.
If the driver attempts to request the oil level during engine ON, the message "ENGINE OIL LEVEL NOT DURING ENGINE OPERATION" appears in the right multifunction display (A1p15).
The waiting time following engine OFF depends on the engine oil temperature.
This is
- up to 20°C 30 min
- as of 60°C 1 min
- In the case of other temperatures, the waiting time assumes corresponding intermediate values.
Display in the event of measuring system errors
In the event of a measuring system error, e.g. in the event of an oil sensor error (oil level, temperature and quality, B40), the oil can symbol and the message "ENGINE OIL LEVEL LOCATE WORKSHOP" appear 30 s following the occurrence of the error at the earliest.
For diagnosis purposes, the ME-SFI control module (N3/10) must also be read out with Star diagnosis.
The instrument cluster (A1) receives the sensor data via the engine compartment CAN from the ME-SFI control module (N3/10).
Oil change
Following each oil change, ASSYST must be reset. On resetting, the remaining distance and the remaining time are reset. Resetting can be carried out via the instrument cluster (A1) or via Star diagnosis.
On resetting, the following data are stored:
- Current kilometer reading, rounded to 100,
- Total of top-up quantities in the last interval,
- Remaining distance,
- Remaining time,
- Product of the quality factors,
- The data of the last five resets
These data can only be read out with Star diagnosis!
The startup distance (internal mileage) is reduced if the prescribed quantity of oil is not filled in when the oil is changed.
(The procedure for resetting via the instrument cluster is described in the document "operating notes".)
Replenishment recognition
- With Star diagnosis, the last ten top-up quantities and the corresponding kilometer readings of the current interval can be called up.
- Replenishment recognition is normally indicated via the extension of the remaining distance in the instrument cluster.
Oil top-ups are only basically recognized if the following conditions are fulfilled:
- The top-up quantity is at least 0.5 l ,
- Following an oil top-up, a journey of at least 5 km must be undertaken under normal driving conditions with an oil temperature of at least 60°C
There are, however, cases in which the display of the remaining distance nevertheless appears implausible following an oil top-up; according to the display, no, or only a minimal, quantity rebate is assigned.
This is due to the fact that the remaining distance is always only displayed in the range from 15, 000 km to 30, 000 km (or 10, 000 to 20, 000 miles), but internal calculation is carried out with the actual values, which may also lie outside of this range.
These internal values can only be displayed with Star diagnosis.
The following diagrams show a few examples of this. In this case, the horizontal (x) axis represents the service interval and the vertical (y) axis the remaining distance, each in km.
The ASSYST display in the instrument cluster always moves within the light area , while the internally calculated remaining distance may also be located in the two dark areas. These internal values can only be displayed with Star diagnosis.
Example 1:
The prescribed nominal top-up quantity was filled in when the oil was changed. The startup distance is therefore 15, 000 km.
After 10, 000 km, oil is topped up under normal driving conditions (a). The quantity rebate (B1) is assigned and displayed. This means that, when the remaining distance is called up, a greater remaining distance is displayed. (Provided that the above mentioned conditions for replenishment recognition are fulfilled.)
Oil is topped up again after a further 5, 000 km (b). A quantity rebate (B2) is also assigned and displayed in this case.
If no further oil is now topped up, and if the vehicle continues to be driven in the same manner, a service interval of approx. 24, 000 km will be achieved.
In this example, the curve lies completely within the light area of the diagram; this means that all oil top-ups are displayed by increasing the remaining distance.
Example 2:
The prescribed nominal top-up quantity was filled in when the oil was changed.
Under very favorable driving conditions, oil is topped up after 10, 000 km (a). The quantity rebate (B1) is assigned internally, the service interval is extended accordingly via an increased remaining distance. However, as the curve is partly located in the hatched area, only the section of (B1) which is located in the light area is initially displayed as an extension of the remaining distance. (Provided that the above mentioned conditions for replenishment recognition are fulfilled.)
Oil is again topped up at 18, 000 km (b). Due to the positive deviation of the maximum service interval of 30, 000 km, no extension is displayed by the quantity rebate (B2) in this case. In this case, the total service interval is 30, 000 km.
If the vehicle continues to be driven under less favorable driving conditions as of point b, the maximum service interval of 30, 000 km may still possibly be achieved due to the internal quantity rebate (B2).
Example 3:
Less than the prescribed nominal top-up quantity was filled in when the oil was changed, for which reason the startup distance is less than 15, 000 km. However, the displayed remaining distance is nevertheless 15, 000 km.
If oil is now topped up after 5, 000 km (a), the displayed remaining distance is not extended, as the curve is located in the hatched area.
However, the quantity rebate (B1) is calculated internally, and results, under identical or more favorable driving conditions, in the extension of the service interval to slightly in excess of 15, 000 km.
The service interval of 15, 000 km is always achieved, even if the internal value is lower.
Example 4:
The prescribed nominal top-up quantity was filled in when the oil was changed.
Oil was topped up (a) after 5, 000 km under unfavorable driving conditions, and this replenishment (quantity rebate B1) was internally recognized.
Two cases will now be examined:
- If the vehicle continues to be driven under identical driving conditions (continuous line), the displayed remaining distance is not extended, as the curve is located in the hatched area.
The service interval in this case is nevertheless 15, 000 km, although the internal value is lower. (The displayed remaining distance is always located only in the light area.)
- If the vehicle continues to be driven under more favorable driving conditions (dotted line), the value of the internal remaining distance slowly moves into the light area.
The service interval may accordingly exceed 15, 000 km.
| Remaining distance function | GF00.20-P-2007R | ||
| Remaining time function | GF00.20-P-2008R | ||
| 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 |