I cannot match PCM connector pinout to wiring diagram
I am trying to track down bank 2 O2 sensor 1 heating element error P0155
I pulled the O2 sensor. ( This is a tricky job with the auto trannny shifter cable down there. Also easiest way to connect/disconnect O2 sensor is from above leaning over the engine and reaching down.)
The sensor has 3.7 ohms across the two white wires.
I reconnected it and the wiring diagram says the yellow/light blue wire goes to pin 94 of the 104 pin PCM connector.
I pulled the PCM connector , popped off the red cover .
Where is pin 94 ?

 

I checked some other pinouts shown on that 4 page 1999 Ford Ranger wiring diagram available online. Most are bogus. I ordered an actual Ford document for 1999 Ranger wiring diagram. Will get back to this post next week.

 

rotate my picture 180 degree and it now works to find the correct pin. coin finally dropped

 

Did you ever figure this out... I am having same issue. All 3 sensors throwing codes but I confirmed good 12 v power and good continuity. cannot figure out why sensors are not sending signals.