P0059 and P2197 with some diagnostics

[GEONV]

Well, this expedition has been a bucket of fun I tell you! I went to take it to get it smogged and was going through the emissions readiness monitors- got em all to be good and then got a check engine light- P0059 and P2197 which indicate drivers side upstream O2 sensor.

I checked in Forscan and saw I had a heater current of 22mA (Min value is 230 mA), and that O2 sensor didn't show any swing in the voltages. I bought a new sensor and same issue (Naturally- why do I keep doing this?). In the wiring diagram it shows 4 wires- Yellow/Light blue which is how the PCM switches the heater on via ground- wire shows connectivity to the PCM- does not show continuity to ground though, Red/Black which is O2 sensor signal has continuity to PCM. Gray/Red (signal wire from O2 sensor- reads same signal as PCM is reading, has continuity to PCM). Red/Yellow which is power to O2 sensor- shows 12 volts and has continuity to PCM.

I verified that the O2 sensor is not actually heating up, neither the old or the new one. All the wires look good- does this mean a PCM problem?

Thanks for the help.

 

[GEONV]

Tricky tricky. Has continuity to wire going into the pcm connector but not to the inside of the connector! Yellow/light blue.

 

[GEONV]

That was it! Fixed it. Connector the pcm wasn’t making good contact. Reshaped the connector after depinning it and now it’s reading perfectly and heating up properly.

 

[whtbronco]

Yep connector was gonna be my suggestion. Glad to see you figured it out.

Well done on the troubleshooting and thanks for sharing details start to finish.