NefMoto > Technical > Data Logging > O2 voltage discrepancy between ME7L and VCDS/ECUx
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Author Topic: O2 voltage discrepancy between ME7L and VCDS/ECUx  (Read 16372 times)
FlyboyS4
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« Reply #15 on: April 20, 2014, 06:24:49 PM »
Quote from: phila_dot on April 20, 2014, 04:38:42 PM
What scaling did you use in the ME7L ecu file on that run?

I have no idea.  If you can tell me where/how to check I'll try and get the info for you.
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userpike
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« Reply #16 on: April 20, 2014, 11:33:44 PM »
Quote from: phila_dot on April 20, 2014, 04:43:56 PM
uulsuv_w is raw voltage straight from the ADC with a range of 0-5v.

What's wrong with lamsoni_w for actual lambda? You won't get a better conversion than the OEM logic.


I just checked out lamsoni_w in the FR. I see why uulsuv_w shouldn't be worried about for the most part.


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julex
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« Reply #17 on: April 21, 2014, 08:41:17 AM »
ME7 logger voltage is spot on, I verified with voltmeter in parallel when investigating Spartan issues. Measured at infinity rich, stoich and infinity lean. ECU and voltmeter readings were thus indistinguishable at 0V, ~2.05V and 5V.
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nyet
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« Reply #18 on: April 21, 2014, 10:22:12 AM »
Quote from: julex on April 21, 2014, 08:41:17 AM
ME7 logger voltage is spot on, I verified with voltmeter in parallel when investigating Spartan issues. Measured at infinity rich, stoich and infinity lean. ECU and voltmeter readings were thus indistinguishable at 0V, ~2.05V and 5V.

So VCDS is wrong?
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phila_dot
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« Reply #19 on: April 21, 2014, 10:54:33 AM »
Quote from: julex on April 21, 2014, 08:41:17 AM
ME7 logger voltage is spot on, I verified with voltmeter in parallel when investigating Spartan issues. Measured at infinity rich, stoich and infinity lean. ECU and voltmeter readings were thus indistinguishable at 0V, ~2.05V and 5V.

This thread is debating the proper scaling factor for 0-1v narrowband voltage usvk and ushk.
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julex
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« Reply #20 on: April 22, 2014, 07:11:01 AM »
Quote from: phila_dot on April 21, 2014, 10:54:33 AM
This thread is debating the proper scaling factor for 0-1v narrowband voltage usvk and ushk.

Gotcha.

Easy way to check is to start the car, run it for couple of minutes logging the voltages and then average all the cells and see what they say. If it is anything but 0.5v then the conversion is wrong.
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