O2 sensor circuit question

I'm working on a 92' 4x4 pickup with 22re

I have replaced the O2 sensor and was checking the

circuit wiring out and with the sensor unplugged I found that I have continuity between E1 and Ox1. Is this normal?

Reply 1 : O2 sensor circuit question

I don't know, but I do know that if you wire the O2 sensor backwards, you're get an error code.

Reply 2 : O2 sensor circuit question

Continuity doesnt count. You're looking for millivolt output when the engine runs.



-SP

Reply 3 : O2 sensor circuit question

define "continuity" If you're using beep mode, keep in mind it'll beep with several ohms resistance (like the heater coil or O2s element *wink*) which is why beep mode sucks for actually checking continuity. use ohms.





More directly, yes they are connected but with high resistance because the O2s sensing element is between them. speedy is right though, ohms isn't relevant, check voltage with the engine running (running for a minute or 2) should alternate from below .2v to above .8v (200mV, 800mV) once a second or so. not the easiest to see on a cheap digital meter but don't use an analog because it's too low impedance.

Reply 4 : O2 sensor circuit question

Thanks for the info guys I got it repaired some previous owner

or shade tree mechanic armed with a butt splice and no idea what

to do with it crimped the shield and center conductor together causing

the pulse singnal to go to ground instead of the ECU. and there should be

no continuity between E1 and ox1 with sensor unplugged of course it could

be several thousand ohms but on a 12v dc circuit that would be the same

as none

Reply 5 : O2 sensor circuit question

on a sensitive voltage sensing circuit even a few thousand ohms to ground is a connection that will throw it off.