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Summary of change:
Subpage of GenBoard/VerThree/FlexFuel Hardware: '''This GM / Siemens Fuel Composition Sensor(FCS) current: GM12570260''' EOL sensor: 12570250 or Continental SE1004S Hard to find connector available here: [https://shop.vems.hu/catalog/ethanol-sensor-connector-p-204.html HU Webshop Ethanol Sensor Connector] or: [https://shop.vemstuning.com/products/delphi_e85_conn US Webshop Ethanol Sensor Connector] And a how-to on setting up display in VemsTune is available: [http://downloads.vems.com/documentation/vems_flexfuel_setup.pdf VemsTune FlexFuel Setup Guide] Sensor reads in Hz. Basic sensor testing: * Freq stability check: ** Turn on power @ 9:30 am Freq. = 69.99 Hz ** Turn off power @ 10:30 am Freq. = 69.99 Hz ** Test room temperature was steady at 67 Deg. F. * Freq. vs input voltage changes: ** 5.5 VDC power supply, Freq. = 69.99 Hz raised up the power supply voltage in 1 volt steps to 16.0 VDC power supply, Freq. = 69.99 Hz Note, sensor stops operating below 5.5 VDC. 16 VDC was the upper end of testing. *Current draw at power supply voltages from 5.5 VDC to 16 VDC: ** 25.7 ma to 25.9 ma or .026 amps! . * Connections on sensor: ** Black is GROUND (Ohm to chassis to prove). ** Pink is 12VDC. (car battery, switched with ignition) ** White is the output signal. (A pull up resistor is needed here because the output is an open collector transistor inside the sensor so any voltage interface will work) ||Hz||gasoline|| Ethanol||Wheel Speed Reading km/h|| ||50||100||0||50|| ||55||95||5||55|| ||60 - E10||90||10||60|| ||65||85||15||65|| ||70||80||20||70|| ||75||75||25||75|| ||80||70||30||80|| ||85||65||35||85|| ||90||60||40||90|| ||95||55||45||95|| ||100||50||50||100|| ||105||45||55||105|| ||110||40||60||110|| ||115||35||65||115|| ||120||30||70||120|| ||125||25||75||125|| ||130||20||80||130|| ||135 - E85||15||85||135|| ||140||10||90||140|| ||145 - E95||05||95||145|| ||150||00||100||150|| * 50hz is 0.5v, 150hz is 4.5v 0-100% ethanol * and the pulsewidth of the input is the temperature of the fuel. * temp formula is ?C = (41.25 * pulsewidth_in_ms) - 81.25 '''170Hz is error output (self diagnostics built into sensor)'''
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