This plot shows the relationship between
the output voltage and the vacuum that is applied to the MAP sensor.
This measurement was taken with a service grade vacuum gauge so there is
probably some error here but it gets us into the ball park. Also
comparing known MAP values in the code to what I calculated here they were
very close so this graph should be fairly close. Below is a table
taken from the code showing the relationship of Vacuum to Voltage to ADC
value (L002a RAM location) and controller displayed Vacuum.
; ; The below table is what I measured for the MAP sensor that is in the '34 ; (11/14/98) ; The displayed VAC was obtained from the simulator............12/29/98 ; ; TAIR: 59 degrees ; ; Vacuum Voltage ADC L0000 VAC ; (in) (L002a) TAIR=59 ; 0 4.55 237 240 -3.2" ; 1 4.44 231 234 -2.4" ; 2 4.32 225 228 -4.7" ; 3 4.15 216 219 -0.6" ; 4 4.00 208 211 0.2" ; 5 3.82 199 202 1.4" ; 6 3.65 190 192 2.5" ; 7 3.463 180 182 3.7" ; 8 3.302 172 174 4.7" ; 9 3.141 163 165 5.6" ; 10 2.953 154 156 6.8" ; 11 2.809 146 148 7.8" ; 12 2.632 137 139 8.8" ; 13 2.415 126 127 10.2" ; 14 2.263 118 119 11.0" ; 15 2.136 111 112 11.9" ; 16 1.954 102 103 13.0" ; 17 1.783 93 94 14.0" ; 18 1.607 84 85 15.2" ; 19 1.437 75 76 16.1" ; 20 1.238 64 65 17.4" ; 21 1.061 55 55 18.6" ; 22 .874 45 45 19.9" ; 23 .695 36 36 20.9" ; 24 .510 27 27 22.0" ; 25 .316 16 16 23.2" ; 26 .134 7 7 24.3" ; 27 .024 1 1 25.0" ; 28 .024 1 1 25.0" ; 29 .024 1 1 25.0" ;