Freq valve?: [urq] My multimeter has frequency % duty not dwell - can

[n-engelbert at terrans.net]

> Hi Dennis
>
> This relates to me trying to test this used MAC-02 ECU
> I bought.  I figured by testing the dwell (hum - this
> is probably the dwell on the frequency valve)  I could
> tell if the 02 sensor loop on this unknown ECU works.
> SO I was going to measure dwell with the cars current
> ECU which seems to work great - and then plug in the
> purchased MAC-02 and see if I can tell if the 02
> sensor loop is working at all.
> steve M.

Steve,

Duty cycle is what you want to be reading.  I have read about measuring
dwell, but that must be converted to a % duty cycle anyway by dividing by
90.   I have some crappy craftsman meter that I use for duty cycle that
measures frequency on the same setting, just push a little gray button on
top to choose between those or something like that, I think I remember the
frequency to be something around 3 or 6kHz.  Maybe you've got the same
meter.

HTH!

Nathan Engelbert
83 UrQ DA900453
89 90q
91 200q20v donor
91 200q20va decapitated, awaiting repair