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O2 sensor test 700

posted by  Will740turbo on  Wed Sep 21 23:15 CST 2011
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last visit: Wed Oct 22 16:09 CST 2014
[RELATED]

If it's a simple serial circuit (ECU to O2 sensor), the voltage will change as the resistance changes.

In effect, you'll be looking at a "voltage splitter" (which is a parallel circuit) setup between a multimeter (I've been warned to use one with >10 MegaOhm resistance) and its ground and the O2 sensor and its ground.

Basically as the resistance of the O2 sensor rises, the voltage will drop - an inverse relationship.
Finding the top and bottom of the ranges, as well as what's a good response speed will be the keys to getting a meaningful result.

Cheers and good luck! The folks over at turbobricks may have some suggestions






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