I'm having intermittent issues with the upstream O2 sensor on my '95 Blazer. It loses signal from time to time, but if the wiring to the sensor is jiggled around, the signal will come back. So, I believe that there is break in the wiring harness somewhere. Does anybody have a diagram of where the sensor is connected to the pcm/ecm, so I can bypass the faulty wire?

 

Hope this helps:


*click on the thumbnail for the full resolution image*

 

Thanks, that's exactly what I was looking for. Now if I can figure out which pin is A10, I'll be in good shape.