MS2 V3.0
Bench testing flex fuel sensor w/stim
MegaTune Ethanol Percentage Gauge reads
13% w/E10
-48% w/E85
E85 Correction Gauge reads
108% w/E10
70% w/E85
Any suggestions?
Flex Fuel
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Flex Fuel
Please post a copy of your MSQ file.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Flex Fuel
Nothing obviously wrong that I could see - do you have any way of checking the sensor?
Re: Flex Fuel
Do not know how to check
It's a new sensor
It's a new sensor
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Flex Fuel
Do you have an oscilloscope or a frequency meter?
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Flex Fuel
Sorry, I can't think of another way to tell what signal it's sending, and it wouldn't be easy to set up a simulated signal.
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Alexander_Monday
- MegaSquirt Newbie
- Posts: 5
- Joined: Sun Jun 28, 2009 5:26 pm
Re: Flex Fuel
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% ethanol.
There are freebe online audio oscillator's that use your PC & sound card so you could use one of them to get close to what frequency is present from the sensor with comparison by ear.
Another possible way would be to send the signal to a sound card imput and use some open source audio oscilloscope software.
But I would probably use a resistor bridge made up of a potentiometer in series and a resistor in parallel after it between the sensor and the sound card to make sure you do not overload it.
With this method you should also be able to look at the pulse width.
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% ethanol.
There are freebe online audio oscillator's that use your PC & sound card so you could use one of them to get close to what frequency is present from the sensor with comparison by ear.
Another possible way would be to send the signal to a sound card imput and use some open source audio oscilloscope software.
But I would probably use a resistor bridge made up of a potentiometer in series and a resistor in parallel after it between the sensor and the sound card to make sure you do not overload it.
With this method you should also be able to look at the pulse width.