Do any of you have a confirmed connector location at the ECU/VCM for the MAP sensor ground? According to my trusty Chilton¹s which lists 94-99s (and excluded 95 schematics), it says ?G19¹ which I can only assume is a typo as the location on the VCM is C19 I think. Rather than using the wrong schematics and trying to correct typographic errors, can anyone confirm exactly which pin on the computer grounds the MAP? I know I could reground it elsewhere but I want it fixed properly (this may cause drops on other circuits sharing the same ground such as the fuel pressure sensor and IAC according to the ?96 schematic I have).
I am 99.998% sure I finally fixed my problem. There¹s a voltage drop of nearly .5V at the MAP ground! When I tested ref voltage using the sensor¹s ground, I got 4.7VDC and when using the alt case or battery I got 5.2VDC! Respectively- when I metered the output voltage, it was also skewed by the same drop value. I¹m assuming that this will cause the computer to adjust fuel trim based on an altitude somewhere on top of a ice-covered mountian... I think if I fix the ground, my cyl 1 misfire should disappear. Back to that nastly connector... anyone??
Thanks! Andrew.