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My understanding, on "Startup", scan = "New"
value used for Cal / learn ,current "run cycle",<br>
[Engine running time ]. Values are round up / down # from actual
barometer reading.<br>
Reset on each startup according to the General . Notice in data
scan KOEO ,<br>
Baro, Map , Ect , Iat, readings are live [ if present ] on a
<u>specific controller's</u> data display.<br>
Some config s use the map value to infer bar o # on Key on IGN =
Scan.<br>
Mother nature enters bleed orifice in MAP sensor.<br>
Correct me if this information is inaccurate.<br>
<br>
Len<br>
<br>
<blockquote type=cite cite>If I remember correctly GM does a baro calc
when the engine is shut<br>
down....never did figure out whether this happens at key on
also...anybody??<br>
-Carl Summers<br>
<br>
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-----Original Message-----<br>
From: owner-gmecm@diy-efi.org
[<a href="mailto:owner-gmecm@diy-efi.org%5DOn" eudora="autourl">mailto:owner-gmecm@diy-efi.org]On</a>
Behalf<br>
Of Heelandtoe@aol.com<br>
Sent: Thursday, September 07, 2000 6:18 PM<br>
To: gmecm@diy-efi.org<br>
Subject: use of MAP in FI calcs<br>
<br>
<br>
I've noticed that in most ECM's all the tables that use MAP as an
index<br>
stop<br>
at 100 kPa. Since its conceivable that MAP could go above 100 kPa
on a high<br>
pressure day at WOT, I'm betting that the computer normalizes it with
the<br>
barometric pressure as in mapbar = 100 * map/baro. This would account
for<br>
the<br>
day to day variation in barometric pressure and normalize mapbar so that
it<br>
better represents true engine load. Have you guys seen any
similar<br>
operations in your disassemblies?<br>
jc<br>
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