Engine oil monitoring, function - GF00.20-P-2009SK

MODELS 171.4 with ENGINE 271.944 up to 31.5.05, 113.989 

General information 

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 active service system PLUS (ASSYST PLUS). Oil top-ups can be detected, and result in a quantity rebate, which correspondingly extends the service interval. Oil overfilling or oil starvation are displayed in the upper multifunction display (A1p13) in the instrument cluster (A1).

The oil warnings are displayed:

• automatically, t = 60 sec. after starting the engine at the earliest, and at an oil temperature of > 60°C.
• In the event of oil overfilling, the oil can symbol and the message "Reduce engine oil level!" appear in the upper multifunction display (A1p13). A brief warning tone is additionally sounded.
• In the event of critical oil starvation, the oil can symbol and the message "Engine oil level - visit workshop!" appear in the upper multifunction display (A1p13).
• In the event of poor oil condition (e.g. water contained in oil), the oil can symbol and the message "Engine oil - visit workshop!" appear in the upper multifunction display (A1p13). A brief warning tone is additionally sounded.
• If the minimum oil level is reached, the oil can symbol and the message "Add 1.0 ltr. for maximum oil level" appear in the upper multifunction display (A1p13). A brief warning tone is additionally sounded.
• In the event of severe oil leakage (e.g. hole in oil pan), the oil can symbol and the message "Engine oil level - Stop, engine off!" appear in the upper multifunction display (A1p13). In addition, a warning tone is sounded.
• automatically, t = 5 sec. after ignition "circuit 15 ON". If the oil level has dropped to a level that is damaging to the engine, the oil can symbol and the message "Engine oil level - stop, engine off!" appear. In addition, a warning tone is sounded.

Procedure to display the oil quantity upon driver request:

• 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 (MFL) repeatedly until the upper multifunction display (A1p13) shows the temperature display and the trip odometer.
• Press the scroll forward/back button (S110s1) repeatedly until the upper multifunction display (A1p13) shows the message "Engine oil level measurement in progress! Measurement is correct only when vehicle is on level ground".

The following messages may now appear in the upper multifunction display (A1p13):

• "Engine oil level OK"
• "Engine oil level, reduce oil level"
• "Engine oil level, top up with 1.0 l"
• "Engine oil level, add 1.5 ltrs."
• "Engine oil level, add 2.0 ltrs."

The quantity of oil to be added can be specified in liters or quarts 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.

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 upper multifunction display (A1p13).

The waiting time following engine "OFF" depends on the engine oil temperature. This is:

• Up to 20°C t = 0 min.
• As of 60°C t = 1 min.

Display in the event of measuring system errors 

If there is a fault in the measuring system such as a fault in the oil sensor (oil level, temperature and quality) (B40), the oil can symbol and the message "Engine oil level - visit workshop!" appear no sooner than t = 30 s after the fault has occurred. For the diagnosis, the central gateway control unit (N93) is also read out using STAR DIAGNOSIS. The central gateway control unit (N93) receives the sensor data from the ME control unit (N3/10) via the Controller Area Network bus class C (engine compartment) (CAN-C).

Replenishment recognition 

The last 10 top-up quantities and the corresponding kilometer readings of the current interval can be called up with STAR DIAGNOSIS. Usually, a refill recognition is indicated by an extension of the remaining distance in the upper multifunction display (A1p13) of the instrument cluster (A1).

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 refill, a trip of at least 5 km must be undertaken 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 (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 quality factors

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

Component description of oil sensor	With engine 271.944	GF18.40-P-2000KE
	With engine 113.989	GF18.40-P-2000SM