Innovate MTX-L Wideband O2 Sensor ISSUE

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
Last_Carton
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Last_Carton »

As in grounding the mtx-l to a ground that is going direct to the PCM?
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Holden202T »

yep that would be a good test
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Last_Carton »

Okay so I have now test with multiple ground locations and all of them give the same result.

This is a photo of the wideband percentage difference for correction of the AFR's, you can see the wideband is 14.0 in the background
https://imgur.com/a/TXHuT9R
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Charlescrown »

Looks like a incorrect formula. There should be no minus figures.
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Last_Carton »

The formula is right, the analog output the ECU is reading is inaccurate of what the gauge is reading. when u change the formula to match its fine, then try to log again and the numbers dont match
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Charlescrown »

Measure the voltage going to the ecu and see if it's a reasonable voltage like 3 volts etc. If it is make sure your using the correct logging file. I have never seen negative values with any log I have done. It should show 7.35 volts with no wideband input and up to 5 volts with a very very lean mixture like 22:1. You are using the yellow wire for the output to the correct ecu input?
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Last_Carton »

Iv just measured the voltage to the PCM and its 2.1v when the gauge is showing 13.4, i also removed the sensor and while it was in fresh air i reset the cal and when it was reading 22.4 i took another reading and it was 5.09v so to me that all seems right. It must be tunerpro setup?
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Charlescrown »

I am only familiar with 12P and 11P and the formula is x/10.
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Holden202T »

post up your ADX so we can confirm what you have in there ?
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Re: Innovate MTX-L Wideband O2 Sensor ISSUE

Post by Holden202T »

oh hangon, just looking at your pic ..... from what I can see that table is a calc to offset ..... so its using the wideband reading and the commanded AFR and giving you the difference, that's why your seeing negatives!

still if you post the ADX I can sort it out so you have the histogram you want ? also if you have a log post that with it.
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