Pcm bad?
#22
I am going to try to search again for short but it's strange that the actual pin on the pcm at 29 has the voltage and that is without c2 connector plugged in at all. I don't even know where to start looking for short because I have no continuity from pin 2 to pin 4 on trans connector and I would think that's where the 5v could be shorted to signal wire if there was a short. Could you tell me what else shares a ground with trans connector ground? I have tried unplugging O2 sensors even though they where reading probably. They never went over .9v
#23
Due to the way the wiring diagrams are laid out, no..... not easily. Pin 28 should NOT be showing power with the connector out of the PCM either. That is NOT what I would consider a 'common' failure, and getting a second PCM with the same problem is unlikely in the extreme. Did you get an actual replacement? Or did you send yours in for repair??
#27
#28
#29
Pretty sure a fair few sensors share the five volt feed, their signal return wires though should be separate. You really shouldn't be seeing 5 volts on the signal return wire..... that should set a code for TPS out of range, or some such. Plug it in and test voltage on the signal return wire. Should be less than 1 volt with throttle close, and greater than 3.5 at WOT.
#30
Tps is working normal. Did some digging and I am getting 90 ohms on the ground circuit C1 connector unplugged slot 4 to trans connector slot 3 it is a black wire with light blue stripe. I unplugged both O2 sensors (they also have same wire they are also reading 90 ohms. The only other place I see black/light blue is tps and that rings out perfectly to ground. Any test that u would recommend I would like to run a new wire from pin 4(also I don't know what color it changed 2 at pcm) to trans.