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Old 12-04-2019, 09:02 PM
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Join Date: Oct 2006
Posts: 79
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.

2005 E320 CDI - 101K
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Old 12-04-2019, 09:05 PM
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Join Date: Aug 2019
Location: NE Pennsylvania
Posts: 171
for map just hook up a pressure/vacuum gauge and compare with ecu value
1990 300SE (Daily driver)
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Old 12-08-2019, 12:07 AM
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Join Date: Oct 2006
Posts: 79
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?

2005 E320 CDI - 101K
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