GF00.20-P-2009GZ Engine Oil Monitoring, Function

GF00.20-P-2009GZ Engine Oil Monitoring, Function

General information
The oil level is monitored constantly by the oil sensor (oil level, temperature and quality, B40), and the corresponding data is passed on to ASSYST.

Oil top-ups can be detected, and result in a quantity rebate, which correspondingly extends the service interval.

Oil overfilling or the missing oil quantities are displayed via the multifunction display (A1p13) in the instrument cluster (A1).

Oil warnings are displayed:
- Automatically, but t = 60 s after starting the engine at the earliest, and with an oil temperature greater than 60 °C.
- In the event of oil overfilling, the oil can symbol appears in the multifunction display together with the display: "Engine oil level, Reduce oil level". A brief warning tone is additionally sounded.
- In the event of poor oil condition (water in oil), the oil can symbol appears in the multifunction display and the display:
"Engine oil, Visit workshop".
A brief warning tone is additionally sounded.
- In the event of critical oil starvation, the oil can symbol appears in the multifunction display with the display "Engine oil level, Visit workshop".
- In the event of minimum oil quantity, the oil can symbol appears in the multifunction display with the display "Engine oil level, top up with 1l engine oil during refueling stop".
A brief warning tone is additionally sounded.
- In the event of severe oil leakage (hole in oil pan), the oil can symbol appears in the multifunction display and the display:
"Engine oil level, Stop, engine off".
In addition, a warning tone is sounded.

Display of the oil quantity:
- Automatically t = 5 s after ignition "Circuit 15 ON"; if the oil level has dropped to a level that is damaging to the engine, the oil can symbol appears and the display: "Engine oil level, Stop, engine off". In addition, a warning tone is sounded.

Procedure for displaying the oil quantity:
- Turn transmitter key (A8/1) to position "Circuit 15 ON" in EIS control unit (N73).
- Press the system selection button (S110s3) on the multifunction steering wheel until the temperature display and the trip odometer appear in the in the multifunction display.
- Press the scroll forward/back button (S110s1) until the message: "Engine oil level measurement in progress" appears in the multifunction display. Measurement is correct only when vehicle is on level ground.
- If the measurement is not interrupted, the message "Engine oil level measurement in progress" appears in the multifunction display after approx. t = 3 s.

The following messages may now appear in the multifunction display:
- "Engine oil level OK"
- "Engine oil level, reduce oil level"
- "Engine oil level, top up with 1.0 l"
- "Engine oil level, top up with 1.5 l"
- "Engine oil level, top up with 2.0 l"

The quantity of oil to be replenished can be specified in liters (L) or quarts (Q) depending on the national version.

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 as described below.

Waiting time
Measuring the oil level is only possible following the expiration 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 multifunction display.

The waiting time following engine "OFF" depends on the engine oil temperature. This is:
- up to 20 °C t = 0 min.
- above 60 °C t = 1 min.

If the message "Comply with waiting time"appears, the previously described waiting time has not been complied with.

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 (oil level, temperature and quality) error, the oil can symbol and the message "Engine oil level, Visit workshop" appear t = 30 s following the occurrence of the error at the earliest.

For the diagnosis, the central gateway control unit (N93) is also read out using STAR DIAGNOSIS. The central gateway control unit receives the sensor data via the CAN engine compartment (CAN-C) from the ME-SFI [ME] control unit (N3/10).

Replenishment recognition
The last 10 top-up quantities and the corresponding kilometer readings of the current interval can be called up with STAR DIAGNOSIS.

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 distance of at least 5 km must be driven under normal driving conditions with an oil temperature of at least 70 °C.

Oil change
An oil change may only be confirmed in conjunction with the total service. Resetting can be carried out via the instrument cluster 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 quality factors

The data for the last 5 resets are stored in ASSYST. This data can only be read out with STAR DIAGNOSIS.