Flex Fuel Sensor input :
- write in the WebShop order comment "wheelspeed2 frequency input needed for Ethanol sensor".
- firmware can be configured to automatically compensate for the Ethanol content based on the sensor readings. (First used by: MembersPage/Sascha )
This GM / Siemens Fuel Composition Sensor(FCS) current: GM12570260 EOL sensor: 12570250
Hard to find connector available here: [HU Webshop Ethanol Sensor Connector]
Sensor reads in Hz.
Basic sensor testing:
- Freq stability check:
- 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)
- 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)
|Ethanol/Hz||Hz. Freq.||% of gasoline||% of Ethanol||Wheel Speed Reading (km/h)|
|60 - E10||90||10||11|
|135 - E85||15||85||26|
|145 - E95||05||95||28|
170Hz is error output (self diagnostics built into sensor)
With anytrim function
- the wheelspeed2 (0-255) can be also used as input (since ~1.1.8x firmware). The wheelspeed2 (which is a freq input) can be used for the Ethanol-concentration sensor.
- wheelspeed1 also but the Ethanol-sensor should normally be connected to wheelspeed2:
- please write in the WebShop order comment "wheelspeed2 frequency input needed for Ethanol sensor".
- also analog input, MAP or fuel pressure (which is 700 kPa absolute pressure analog input - MAP) can be useful for anytrim compensations
[external link for sensor] (config settings not relevant)