MSefi.com read only forum (Jan.15,2018)

Thanks!

According to lots of literature, the GM gives a PWM output with the frequency for ethanol % and the pulse width for temperature. 50 Hz 0% & 150 Hz 100%. I could not find definite literature on the Ford. Was hoping someone had the answer for me to save time and money.

Does anyone have the answer to this. I have come across some information that points to the Ford Seimans unit being internally identical, but do not have one to test. I would like to use the Ford, due to the fact that it apparently has threaded inputs.

Just a couple of thoughts for a low tech way to get a rough idea of the sensor signal.
Take it for what you paid for it.

I would think that a high impedance earbud would let you listen in to the frequency component which is related to the ethanol content.
IIRC 50HZ is no ethanol and 150HZ is 100 ...