Quote:
Originally Posted by dj2020
And to expand on this, the GM sensor seems to have one sensor wire...how does the ECB-1 get both ethanol content and fuel temp signals from one signal wire?
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I did some pretty heavy reading and have more information now. The three lines are exactly as I assumed.
Vcc = +12V in
Vout = Output
GND = Ground
To answer your question, this is what's involved in the Vout signal:
The sensor output is both frequency and pulse width.
Ethanol content is output as a frequency of 50-150Hz. The math is:
E% = Freq - 50
180-190Hz means water contamination.
Temperature is output as a pulse width of 1ms-5ms. The math is:
Temp(c) = (41.25 * PW) - 81.25
There's mention of a pull-up resistor possibly being required to bridge between Vout and Vcc. Looks like rigging up a cable would be pretty straightforward. The Delphi connectors are readily available on Mouser to do this the "right way".