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Either http://rusefi.com/forum/viewtopic.php?f=3&t=906#p18363 is not a divider or I am missing something. I took three measurements but I do not get consistent pull-up value, maybe I am doing something wrong?
ignition on, weak battery: vbatt=11.0v, wire connected=4.6v, wire disconnected resistance to GND = 120R. divider formula gives pull-up = 86.25R
ignition on, 50A charger: vbatt=13.0v, wire connected=5.5v, wire disconnected resistance to GND (still) = 120R. divider formula gives pull-up = 88R
car idles, cold engine shows 45 lb/in^2, vbatt=14.2, wire connected=3.2v, wire disconnected resistance to GND = 79.3R, divider formula gives pull-up = 23.07R
I do not get it. I would expect the pull-up to be the same regardless of if car is running or not, since ignition is on?