gm map sensor

[Walter Sherwin]

Jeff & Hamid,

Here's something from the FTP site from a while ago
ftp://ftp.diy-efi.org/incoming/Map1Map2_Transforms.xls covering the 1bar and
2bar GM MAP sensors.  I have not yet worked-up the 3bar MAP relationships,
although I need to at some point.  If someone gets to this task first, I'd
sure appreciate a copy of your findings, as it would save me a bunch of time
(never enough hours in the day around here...).

Walt.



> hamid gatch-karan wrote:
> > I am looking for data shits for 1 bar, 2 bar , 3 bar
> > gm map sensor.
> > Have anybody the addresses of these data sheets?
>
> I am interested in this as well.  I'll probably try to do a calibration
> myself sometime soon.  If anyone has some calibration data, please post
> it to the list.
>
> The only data I have is something that someone posted several years
> ago.  I have attached it below.
>
> Jeff Webb
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
>
> GMC EFI engine MAP sensors calibration data, page one
>
> Input   model 460       model 835       model 834
> IN Hg   output VDC      output VDC      output VDC
> 0       4.620           4.602           0.560
> -1.0    4.442           4.424           0.741
> -2.0    4.264           4.249           0.923
> -3.0    4.086           4.075           1.105
> -4.0    3.908           3.899           1.287
> -5.0    3.73            3.724           1.469
> -6.0    3.552           3.548           1.652
> -7.0    3.374           3.370           1.834
> -8.0    3.196           3.195           2.016
> -9.0    3.018           3.019           2.199
> -10.0   2.84            2.842           2.380
> -11.0   2.662           2.667           2.562
> -12.0   2.484           2.485           2.745
> -13.0   2.306           2.303           2.928
> -14.0   2.128           2.121           3.111
> -15.0   1.95            1.940           3.293
> -16.0   1.772           1.758           3.475
> -17.0   1.594           1.577           3.657
> -18.0   1.416           1.395           3.840
> -19.0   1.238           1.219           4.022
> -20.0   1.178           1.043           4.204
>
> b=4.610
> m=0.176
>
> Connector       green   red     gray
> output wire     green   green   green
>
> sensor  0 to 28"Hg      0 to 28"Hg      0 to 28"Hg
> range   direct acting   direct acting   reverse act.
>
> output volts    0.175V  0.178V          0.182V
> per inch Hg.
> input
>
>
> GMC EFI engine MAP sensors calibration data, page 2.
>
> Input   model 833       Input   model 886
> ?       output VDC      IN H2O  output VDC
> 0       4.629           0.0     2.347
> 0.1     4.612           0.5     2.435
> 0.2     4.593           1.0     2.522
> 0.3     4.575           1.5     2.610
> 0.4     4.557           2.0     2.698
> 0.5     4.539           2.5     2.786
> 0.6     4.521           3.0     2.874
> 0.7     4.502           3.5     2.961
> 0.8     4.484           4.0     3.049
> 0.9     4.466           4.5     3.136
> 1       4.448           5.0     3.224
> 1.1     4.429           5.5     3.312
>                         6.0     3.395
>
> sensitivity                     sensitivity
> 0.182V/inch Hg          0.175V/inch Hg
>
> Connector       blue            Connector       yellow
> output wire     gray            output wire     green
> wire stripe     black trace     wire stripe    ??
> sensor  ???                     sensor  -25" to +9#
> range   reverse act.            range   reverse act.
>
> Data was given in inches water for the 886. Unit of measure were not
> specified for the 833. Possibly the data represents about 0.18 volts
> output per inch mercury pressure input for both 886 & 833.
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