use of MAP in FI calcs

[Len Sabatine]

   My understanding, on "Startup", scan = "New" value used for Cal / learn 
,current  "run cycle",
   [Engine running time ]. Values are round up / down # from actual 
barometer reading.
   Reset on each startup according to the General . Notice in data scan KOEO ,
   Baro, Map , Ect , Iat,  readings are live [ if present ] on a specific 
controller's data display.
   Some config s use the map value to infer bar o # on Key on IGN = Scan.
   Mother nature enters bleed orifice in MAP sensor.
   Correct me if this information is inaccurate.

   Len

>If I remember correctly GM does a baro calc when the engine is shut
>down....never did figure out whether this happens at key on also...anybody??
>-Carl Summers
>
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>-----Original Message-----
>From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
>Of Heelandtoe at aol.com
>Sent: Thursday, September 07, 2000 6:18 PM
>To: gmecm at diy-efi.org
>Subject: use of MAP in FI calcs
>
>
>I've noticed that in most ECM's all the tables that use MAP as an index
>stop
>at 100 kPa.  Since its conceivable that MAP could go above 100 kPa on a high
>pressure day at WOT, I'm betting that the computer normalizes it with the
>barometric pressure as in mapbar = 100 * map/baro. This would account for
>the
>day to day variation in barometric pressure and normalize mapbar so that it
>better represents true engine load.  Have you guys seen any similar
>operations in your disassemblies?
>jc
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