FTC 15 vs 22
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12 Second Truck Club
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From: The Chicken Ranch, California
FTC 15 vs 22 Can someone please explain exactly what the difference is between FTC 15 and 22. I am finding that all of my 100% TPS runs are in 15. On my last log, I hit 22 between 0-61% TPS. Are there pros/cons to this behavior, or is it just normal?
Thanks.
Thanks.
TECH Regular
Joined: Nov 2003
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From: Dallas
Trucks seem to use cell 15 for WOT and cell 22 only for a few open loop, non-PE conditions. Cell 15 is a normal fuel trim cell defined on the Main VE table by the fuel trim boundaries (MAP>77kPa, RPM>2200). Cell 15 can have + or - fuel trims in closed loop and will lock to 0 in OL if CL trims are negative. Cell 22 is an open loop only condition where the evaporative purge solenoid is operational. I see very little of cell 22 and lots of cell 15.
Thread Starter
12 Second Truck Club
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From: The Chicken Ranch, California
Originally Posted by deezel
Trucks seem to use cell 15 for WOT and cell 22 only for a few open loop, non-PE conditions. Cell 15 is a normal fuel trim cell defined on the Main VE table by the fuel trim boundaries (MAP>77kPa, RPM>2200). Cell 15 can have + or - fuel trims in closed loop and will lock to 0 in OL if CL trims are negative. Cell 22 is an open loop only condition where the evaporative purge solenoid is operational. I see very little of cell 22 and lots of cell 15.
I have changed my boundaries, although to somewhat
different values (I went with 1000, 2000, 4000).
Basically one row is wasted on idle, but the other
three are light cruise, medium cruise and up-on-the-
converter.
I have detected no issues from this. I did it at the
time of my last MAF swap.
different values (I went with 1000, 2000, 4000).
Basically one row is wasted on idle, but the other
three are light cruise, medium cruise and up-on-the-
converter.
I have detected no issues from this. I did it at the
time of my last MAF swap.
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Originally Posted by Magic Chicken
Can someone please explain exactly what the difference is between FTC 15 and 22. I am finding that all of my 100% TPS runs are in 15. On my last log, I hit 22 between 0-61% TPS. Are there pros/cons to this behavior, or is it just normal?
Thanks.
Thanks.
FTCs
joel 
