Guys,

I posted the same in W212 a few days ago, hoping for M278 engine owners .

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I am also hoping someone with M157 engine and M157 extended performance engine have logged their oil pump, oil pressure profile like I did with M276.820 3.0 turbo.
No need oil solenoid defeat, just original MB oil pressure algo for his/her specific engine.

It will be great to share the learning of possibly a different oil pressure base map, MB program for different engine.

There is a thread, where S63 M157 has an oil pressure sensor B42, but owner can't get the oil pressure data from the modules as how one can get coolant temperature data, with a Foxwell NT510 Elite.
This engine thread is here : https://mbworld.org/forums/mercedes-...es-me-cel.html
Based on the Xentry simulator , to test the oil pressure is possible and the target value is at or higher than 2.5BAR ( 36.25 psi ) at 2,500 - 3,500 RPM .... if that is based on warm engine oil,
that is 10PSI higher than regulated/reduced oil pressure of M276.820 3.0 Turbo at 27.x PSI at same RPM range ( while pressure reduced by engine oil solenoid ).


Many Thanks.....

 

I cant seem to remember, but does XENTRY say to use an external oil pressure gauge like the WIS does?

 

If the Xentry page is like below, the data pids will come from ECM, the ACTUAL VALUE. Not from external oil pressure gauge.

 

Good point. But where the heck can you read that pressure? If it could be read using XENTRY, I wonder if the WIS instructions are the same.

Just checked WIS. The instructions say to remove the oil pressure sensor and attach the external pressure gauge. What the heck?

 

 

Now that's funny.

 

What is curiously absent from this diagram is the B42 sensor. But maybe I haven't found the right diagram yet.

 

Jetta,

I think that WIS is meant to verify oil pressure mechanically, like a 2nd instrument if B42 electronic sensor we suspect is not giving proper reading as read by Xentry.
It is very specific, which includes oil thermometer dipstick style and wants oil temperature to be at least 100C or 90C.
I once have a dipstick style VDO electric oil temperature sensor.

In fact its data table is good enough and the same as what I have logged M276.820 with the Banks Gauge when oil solenoid is not defeated.


Now the question is, why is that specific Xentry simulator page specified : at or higher than 2.5BAR if RPM 2.500-3.500 RPM ??
The WIS table is obviously showing 1.7 to 2.3 BAR between 2,500 - 3,500 RPM. and this is true for M276.8 , when oil solenoid NOT defeated.

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He who wrote those engine introduction booklet M276/M278/M157, I suppose simplified the 2 stage oil pressure information as 2 and 4 BAR
There are minor error/difference I notice between engine intro booklet vs WIS. For M276.8 , VVT degrees range is different on WIS vs booklet. A bit different, like 3 degrees or so if I recall .