Here is what I have on the pinout for the 411 O2 sensors.
Here is what I have on the pinout for the 411 O2 sensors.
connect pin 28 and 29 additionally to ground!
The PCM will put 0.45V onto the pins when an O2 sensor is not connected. Maybe you don't have a connection between the O2 sensor and the PCM pin. Double check your wiring.
To further what mecanicus posted, the negative side of the O2 sensor element should be connected to the sensor case inside the O2 sensor, but some O2 sensors have been found to not have that connection. The PCM won't work without it. See the "case" jumper inside the O2 sensor.
Thank you all for the replies. I will add the grounds to the two pins, (26&29) and just so you know, I was reading “4.5 volts” at the high signal pin wire(purple /white wire at pin 69 C1 blue connector) not the .450mv you mentioned, leading me to believe I made a wiring mistake.
I went over my pinouts front to back, front to back many times, so I doubt that is the case. I will disconnect the PCM from the harness, and verify all the powered connections, and the O2 sensor wiring for positive voltage at those pins. I even swapped the PCM to see if I had the same situation, and it does. So, back to chasing “Gremlins”
Thanks!
Ben Smith
“He who lives by the Sword, gets Shot by those who don’t”
Well, only ground the pins if they are not already connected to ground internally in the O2 sensors. Otherwise, you can cause issues ranging from noise to those wires melting.
Ok, yesterday I replaced both of my O2 Sensors, I think my bank one sensor wire harness has a break in one of
The leads between the PCM and the sensor.
But I got the bank two sensor reading like normal, what a difference in the way it runs, now to trace out the other side,
Probably tomorrow evening.
I pulled two plugs out to see how they looked, even though its running like crap, the insulators are a darker tan color,
So, once I get the other sensor reading I’ll let you all know what I find.
Ben Smith
“He who lives by the Sword, gets Shot by those who don’t”
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