> On 13 May 1996, Harvey Chao wrote: > > I have a modest concern about this. In essense you are probing a very high > > impedence input channel with an ohmeter. Depending upon the meter and > > resistance range selected on the meter, such action imposes a voltage into > > this input channel that may not be compatible with the circuit under test. > > Without know the components, meter, and circuit, there is some potential risk > > of damage in this process. Harvey- Well, since i was the one that subjected my ecu to the proding and probing of a disrespectful ohm-meter, i'll comment :) i thought of this concern too and probably would not have done it if i had just an analog meter. i used a Fluke 78 digital multi-meter and these are supposed to have an extremely high impedance when checking voltages and also be very 'easy' on components when checking resistance. i don't have the specs for the forward voltage in resistance mode, however. since the O2 sensor itself generates a voltage i figured i would be pretty safe testing this particular circuit. -dan
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