O2 Sensor Voltage?
O2 Sensor Voltage? Anybody have any idea what the voltages should be with key on power to the O2 sensor? 12v should be to one of the heater wires, but then I'm showing power in varying strengths on the remaining three wires.
5 volts on the reference wire. 12+ volts on the heater power wire. Then there is the signal wire. The other is a ground.
Sorry, it's been a while since I messed with this stuff. I'll take a look in the service book and get back to you.
I think you should see 5v (reference voltage from the PCM) on the signal wire with the KOEO.
What's the matter with the car? Are you throwing O2 sensor codes?
Another thing, if you are probing the pigtail, make sure you haven't accidentally shorted the wires. This would cause a blown sensor fuse and you'd get some screwy measurements and throw some codes as a result.
I think you should see 5v (reference voltage from the PCM) on the signal wire with the KOEO.
What's the matter with the car? Are you throwing O2 sensor codes?
Another thing, if you are probing the pigtail, make sure you haven't accidentally shorted the wires. This would cause a blown sensor fuse and you'd get some screwy measurements and throw some codes as a result.
I'm getting weird voltages on both passenger and driver's side o2 harnesses. I must've melted something else as I talked to a Chevy tech. yesterday who said I should only be getting voltage through one wire with Key On, which would be for the heater.
However, I still haven't been able to look at my Gm manual to refresh my memory. Sorry!
But...Here's a link to a long thread that may help you. (Start looking on page 3. Don't miss post #63 on page 4.)
https://ls1tech.com/forums/showthrea...h+spoke&page=4
