Hello,
I have been testing my MS-II V3 board for use with a fuel composition sensor. Initially I was consistently seeing ethanol percentage values of about -6% in TunerStudio. Bench testing of my sensor revealed that it was always sending a signal of about 43Hz.
I obtained another fuel composition sensor which bench tested OK. However now that I have hooked it up to MegaSquirt, I am not seeing any reading for the sensor in tuner studio. When I connect my multi-tester to JP4 on the MS daughter card I am seeing 111Hz and about 3.26v DC. TunerStudio always shows the ethanol percentage to be 0%. This is true whether the sensor is connected or not. And it is also now true for the non-working sensor as well.
I can read the sensor output on the JP4 pin with my meter, but the ethanol percentage shown in TunerStudio remains pegged at 0%.
I have wired the flex fuel sensor as recommended at http://www.megamanual.com/flexfuel.htm, with a 10K Ohm pull up resistor from the proto area 5v to the sensor output lead. Is there anything I can do to further verify whether MS is seeing the signal on JP4?
Megasquirt Ignoring Flex Fuel Signal Data
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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.
Re: Megasquirt Ignoring Flex Fuel Signal Data
Maybe I should clarify the problem I am having with MegaSquirt and the Flex Fuel Sensor....
MegaSquirt was working fine and I was seeing data from the fuel composition sensor in TunerStudio. However, the fuel composition sensor was bad. It was sending a signal <45Hz indicating an error condition. Also I later discovered that the bad sensor occasionally emits a high voltage on its output wire. While bench testing, I have seen spikes of approximately 12v.
I have swapped out the bad fuel composition sensor for another one that works fine. Unfortunately MegaSquirt does not seem to be seeing the sensor's signal any longer. If I connect my multi-tester to MegaSquirt JP4, I can see a 112Hz signal from the sensor. Unfortunately, nothing is showing up in TunerStudio.
I have a hunch that the voltage spikes from the bad composition sensor may have fried MegaSquirt's JP4 input circuitry. I have read in some other forum threads that the fuel composition sensor wiring instructions published in the MegaManual are poor and lack circuit protection for JP4.
Has anyone ever seen a similar problem where the JP4 input on a MegaSquirt-II daughter card stops functioning? If not where should I begin to look for an answer to this problem?
Thank You,
Brett
MegaSquirt was working fine and I was seeing data from the fuel composition sensor in TunerStudio. However, the fuel composition sensor was bad. It was sending a signal <45Hz indicating an error condition. Also I later discovered that the bad sensor occasionally emits a high voltage on its output wire. While bench testing, I have seen spikes of approximately 12v.
I have swapped out the bad fuel composition sensor for another one that works fine. Unfortunately MegaSquirt does not seem to be seeing the sensor's signal any longer. If I connect my multi-tester to MegaSquirt JP4, I can see a 112Hz signal from the sensor. Unfortunately, nothing is showing up in TunerStudio.
I have a hunch that the voltage spikes from the bad composition sensor may have fried MegaSquirt's JP4 input circuitry. I have read in some other forum threads that the fuel composition sensor wiring instructions published in the MegaManual are poor and lack circuit protection for JP4.
Has anyone ever seen a similar problem where the JP4 input on a MegaSquirt-II daughter card stops functioning? If not where should I begin to look for an answer to this problem?
Thank You,
Brett