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O2 sensor heater control system 200 1989

posted by  Maxspeed on  Wed Dec 31 18:00 CST 1969
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last visit: Mon Jan 20 21:55 CST 2014
[RELATED]

Thanks Art. I knew that it ran off of fuse #4 but didn’t know it was only
active while running. I’m hoping the relay may have a bad connection on one
of the contacts as I get power to #4 while running but still no voltage to
the O2 heater. As long as I’m driving my aftermarket O2 gauge shows it
working property but when at idle it does not vary from .01 to .09 volts as
it should and the idle gets a bit rough. I let the car sit for over a year
and had to pull all the fuses and clean the holders with a brass brush. So
I thinking the relay may be corroded and need replacing. At least that’s my
next step, if it doesn’t work after that I guess it’s time to find the
broken wire. Thanks for your help. Max.





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