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Summary of change:
VemsAudiAan mot55/pin41 '''A/C idle up => voltage divider to protect mch3''' (raw extra ADC mcp3208/3 ). We assumed it is 5V or "12V", and 0V when off. The mch3 has an 1 + 100k / 75k voltage divider (from EGT2 ad597 output), so 68k series with the 100k (in heatshrink coming from mot55/pin41) makes the voltage dividor ratio: * 1 + 168k / 75k * Vdiv=1+168/75 ( = 3.24 ) * V=[5, 12, 16] * V ./ div = 1.54 3.70 4.94 So dividing 5, 12 and 16V to => 1.54V, 3.7V and 4.94V respectively (activation threshold is normally around 0.9 .. 1V). So it should clearly detect on and off condition. (and apparently it does, A/C idle up function became popular). Please edit: What raw voltage do you see in view gauges / raw ADC ( mch3 ) when A/C clutch is on and off ?
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