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Old 06-29-2012, 11:28 AM   #35
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Join Date: Feb 2008
Location: Philadelphia
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My Ride: M3 & ZHP
Originally Posted by smooth1 View Post
The MS43 DME has two outputs for this, which might be what you're talking about for the second pin assignment. One is for the secondary air pump and one is for the secondary air valve. These outputs are only used during warmup until about 48.3C (119F).
According to RealOEM, the M52TU cars and the M54 cars both use the same SAP assembly though (until 03/2003 anyway).
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