Post facelift MAF / MAP output question. - Mercedes Benz SLK Forum

Performance MODS for the R170 Tuning and Performance modifications for your SLK

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#1 Old 04-16-2011
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Post facelift MAF / MAP output question.


I am trying to understand the MAF and MAP outputs on a post-facelift 230. On the pre-facelift model (has no MAP) when the MAF output hits 5.0V the ECU will cause a limp mode.

I measured the MAF output of my post-facelift at 5.27V without going into limp mode. The MAP output measured around 3.0V max, no matter how hard I accelerated.

Can anyone help me understand how these two signals are used, especially in the determination of limp mode?

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