what load is LTFT Low?
Jan 14, 2011, 07:02 PM
#1
what load is LTFT Low?
Like the title states, what load is LTFT Low? I know it is idle but is it triggered by load? Lets say car idles at 26 load (40 KPA), does that mean in anythign BELOW that, no matter what RPM, is LTFT Low territory?
Jan 15, 2011, 10:34 AM
#2
Fuel trims are Hz ranges, not load. There is a table in the ECU (if you have it defined) that sets what ranges the change from Low to Mid and Mid to High occurs. I have it labeled as 'Closed Loop - LT Trim Control'.
For 9653, the defaults are Low-->Mid: 75 Hz and Mid --> Low: 62.5 Hz
What that means is when you're idling anything below 75 Hz will be LTFT Low. Once you cross 75 Hz, you need to fall back under 62.5Hz before LTFT Low becomes active again.
For 9653, the defaults are Low-->Mid: 75 Hz and Mid --> Low: 62.5 Hz
What that means is when you're idling anything below 75 Hz will be LTFT Low. Once you cross 75 Hz, you need to fall back under 62.5Hz before LTFT Low becomes active again.
Jan 15, 2011, 10:40 AM
#3
^ What he said. here's what you need to add to your xml to be able to see the tables in EcuFlash for 88590015:
<scaling name="LT Trim Hz" units="Hz" toexpr="x*6.29" frexpr="x/6.29" format="%.0f" min="0" max="1610" inc="6.29" storagetype="uint8" endian="big"/>
<table name="Closed Loop - LT Trim Control Ranges" category="Advanced Fuel Control" address="3021" type="2D" level="1" scaling="LT Trim Hz">
<table name="Conditions" type="Static Y Axis" elements="4">
<data>Low -> Mid</data>
<data>Mid -> Low</data>
<data>Mid -> High</data>
<data>High -> Mid</data>
</table>
</table>
<table name="Closed Loop - LT Trim Control Ranges" category="Advanced Fuel Control" address="3021" type="2D" level="1" scaling="LT Trim Hz">
<table name="Conditions" type="Static Y Axis" elements="4">
<data>Low -> Mid</data>
<data>Mid -> Low</data>
<data>Mid -> High</data>
<data>High -> Mid</data>
</table>
</table>
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