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Using LTFT gives you only the low load parts of the VE table.
In your situation, it might be best to use wideband-only with CL/LTFT/STFT disabled, and MAF disabled also (i.e SD).
You have to fail the MAF (force a MAF DTC to show up) otherwise the PCM will still use the MAF...
the PCM uses the MAF as follows:
- above B0120: MAF only,
- below B0120: MAF for steady state (airmass changes less than some threshold), VE for transient air (i.e. where airmass is changing faster than the threshold),
where B0120 is typically 4000 rpm.
As you can see, with MAF enabled, the MAF will be used as much as possible.
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Using LTFT gives you only the low load parts of the VE table.
In your situation, it might be best to use wideband-only with CL/LTFT/STFT disabled, and MAF disabled also (i.e SD).
You have to fail the MAF (force a MAF DTC to show up) otherwise the PCM will still use the MAF...
the PCM uses the MAF as follows:
- above B0120: MAF only,
- below B0120: MAF for steady state (airmass changes less than some threshold), VE for transient air (i.e. where airmass is changing faster than the threshold),
where B0120 is typically 4000 rpm.
As you can see, with MAF enabled, the MAF will be used as much as possible.
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anyway to fail MAF and not be on the backup ve table?
can I change the DTC to do not report? I guess that wouldn't throw it in SD though..
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No, unfortunately not...
when Backup VE exists, PCM will use that when MAF is failed.
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