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ztan · 09-13-2015, 05:58 AM

Starting reference: http://www.ecmtuning.com/wiki/ethanolsensorparts

The most commonly available Flex Fuel sensor around the market are the GM ones that send a 50Hz square wave out at E0 and 150Hz out at E100. 190Hz is output for water contamination.

We can buy a controller off the shelf to read the square wave frequency and convert it to a voltage signal that the ECU can read easily: available from any one of the vendors at the moment - saves a lot of time, but where's the fun in that? Alternates are to make our own frequency to voltage controller box or code the ECU to do the frequency analysis internally.

09-13-2015, 05:58 AM	#2
ztan Senior Member Join Date: Jul 2013 Drives: Toyota 86 Location: Gold Coast, Australia Posts: 311 Thanks: 44 Thanked 359 Times in 143 Posts Mentioned: 60 Post(s) Tagged: 0 Thread(s)	Flex Fuel Hardware + Controller. Starting reference: http://www.ecmtuning.com/wiki/ethanolsensorparts The most commonly available Flex Fuel sensor around the market are the GM ones that send a 50Hz square wave out at E0 and 150Hz out at E100. 190Hz is output for water contamination. We can buy a controller off the shelf to read the square wave frequency and convert it to a voltage signal that the ECU can read easily: available from any one of the vendors at the moment - saves a lot of time, but where's the fun in that? Alternates are to make our own frequency to voltage controller box or code the ECU to do the frequency analysis internally. Last edited by ztan; 09-13-2015 at 07:00 AM.