E-Class (W211) 2003-2009

How to test MAP/MAF sensor

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Old 12-04-2019 | 07:52 PM
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arcteryx's Avatar
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W211 CDI
How to test MAP/MAF sensor

The WIS I have is not showing how to test the MAP and MAF sensors. This is a pretty critical piece of data to work on vehicles. Does someone know how to do this and/or what the resistance should be between the pins? I searched for Bosch too and came up empty.
Old 12-04-2019 | 08:10 PM
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Use a scan tool like icarsoft or Foxwell to see maf and map live data.

Last edited by tjts1; 12-04-2019 at 08:14 PM.
Old 12-04-2019 | 08:23 PM
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Yes I can do that, I have a Foxwell. But what are the ranges though? I can't seem to find what acceptable values are.
Old 12-04-2019 | 08:30 PM
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I remember seeing around 175 peak in the 3.2 v6
Old 12-07-2019 | 05:34 PM
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Accordingly to the diagnostics, the Boost pressure, Atmospheric pressure and Intake Air pressure should all be within 30 hPa. I measured mine, they are below

boost- 976
atmospheric -990
intake air- 790

I bought a new map pressure sensor and the same readings were thrown for both. I am thinking of replacing the MAF. I am throwing a e2025 B28/5 which is the signal voltage too high. I have noticed my MPG is significantly lower at 26-27 highway and it has a sluggishness.

It's possible the new Bosch sensor I purchased is bad, but I doubt that is the case. Is there any other sensor that would cause the intake to be lower? Can someone read their's and report back?

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