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-100 fuel trim readings? really? help me

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8 years 6 months ago #13443 by tloftis
-100 fuel trim readings? really? help me was created by tloftis
My fuel trim reading from my modis say -100 on both of them... short and long. why?

what do I test next with the modis?

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8 years 6 months ago #13444 by tloftis
Replied by tloftis on topic -100 fuel trim readings? really? help me
1997 Mazda b4000 truck.

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8 years 6 months ago #13448 by Noah
Replied by Noah on topic -100 fuel trim readings? really? help me
Is there any driveability symptoms, or trouble codes? My first thought is that could be a default number or substituted value displayed during closed loop operation
Make sure the loop status displays "closed loop" before putting much stock in fuel trims.
I like to check generic obd 2 data when I see unfamiliar or unexpected fuel trim values. It's helpful to check them at different RPM ranges after the engine and the O2s are heated up.
"Ground cannot be checked with a 10mm socket"
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8 years 6 months ago #13449 by Tyler
Replied by Tyler on topic -100 fuel trim readings? really? help me
Any way you could take a screenshot and post it here? Not that I doubt what you're seeing, just never seen trim numbers like that before. :lol:

If you're looking at Global data, there are some PIDs that can be misleading. 'Short Term Fuel Trim B1S2' or 'Short Term Fuel Trim B2S2' will display 99.7% on most scanners, and are NOT true fuel trim readings.
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8 years 6 months ago #13459 by tloftis
Replied by tloftis on topic -100 fuel trim readings? really? help me
i will see what I can do to post the files. I may be able to upload them to my youtube?

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8 years 6 months ago #13462 by Tyler
Replied by Tyler on topic -100 fuel trim readings? really? help me

tloftis wrote: i will see what I can do to post the files. I may be able to upload them to my youtube?


A video would work! If you saved the scan data, you can connect the Modis to your computer and use ShopStream Connect to open the data file. Makes reviewing data much easier. ;-)

Or, if you want to take some smartphone pictures, you can upload those directly to the forum for posting. Just make sure they're less than 5 MB.

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8 years 6 months ago #13464 by ScannerDanner
Replied by ScannerDanner on topic -100 fuel trim readings? really? help me
Are you just looking at your scan data values to learn? Or are you having an issue with your truck?
If there are no issues and no check engine light, here are your options:
#1 You a viewing downstream trim numbers that are not valid on your vehicle
#2 You are using a scan tool that is giving you some b.s. data
Don't be a parts changer!
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8 years 6 months ago #13482 by tloftis
Replied by tloftis on topic -100 fuel trim readings? really? help me
I had an egr code going off and then when I tested it again to see if everything was fixed I saw the fuel trims. No codes are present now. I just put in new o2 sensors like an idiot lol

I watch you read them all the time on your Versus and I thought my modis should show fuel trim results also????...????

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8 years 6 months ago #13483 by Tyler
Replied by Tyler on topic -100 fuel trim readings? really? help me
Your Modis should have no trouble displaying fuel trims on your B4000. :unsure: Are you using Global or OEM data?

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8 years 6 months ago #13486 by tloftis
Replied by tloftis on topic -100 fuel trim readings? really? help me
global and oem.... I am going to try again tonight but I have yet to get it to show me trim info other than -100 reading for both???

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8 years 6 months ago #13487 by tloftis
Replied by tloftis on topic -100 fuel trim readings? really? help me
and my modis reads other fuel trims just fine. I am working on getting the files uploaded to youtube and then I will post a link.

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8 years 6 months ago #13490 by Tyler
Replied by Tyler on topic -100 fuel trim readings? really? help me
Awesome, thanks!

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8 years 6 months ago #13493 by tloftis
Replied by tloftis on topic -100 fuel trim readings? really? help me
how do you all share movie files?

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8 years 6 months ago #13494 by Tyler
Replied by Tyler on topic -100 fuel trim readings? really? help me
There's no direct way to upload videos to the forums, so we've been using other hosts. YouTube works. I've also used Vimeo in the past, very easy to upload videos from my phone.

After it's uploaded, you can just copy the link into a message here.

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8 years 6 months ago #13511 by Tyler
Replied by Tyler on topic -100 fuel trim readings? really? help me
Bump! Any luck, tloftis?

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