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95 C2500 6.5 turbo diesel 16212488 PCM
This truck uses an APP sensor on pedal to feed the PCM with three different voltage ranges to calculate TPS% Angle.
Now this is where it goes way over my head. How and where does the PCM use those voltages to to calculate TPS%?
Hardware? Software?
The PCM hardware should read these as 3 separate 0-5 volt input signals and the software will use these values to calculate a TPS value.Quote:
Originally Posted by brian617
Sounds reasonable, kind of what I had imagined. Is this a parameter that could be defined in the XDF? Or just written in code?
this is intreging a little,spent 2-4 hours laying on my belle changing pumps down in texas. wisdom in motion
That's it? No deep explaination, I know there are some great minds on here.
I flipped though the disassembly here: http://www.gearhead-efi.com/Fuel-Inj...4&d=1331397174 and found this section
;************************************************* ***********************
;* MODULE START: APP CONDITIONING
;************************************************* ***********************
The DIS shows where it is reading values from the 3 potentiometers. Its going to take some stepping through the code to see where the final value is calculated. From what I glanced through, it has three pots. One increasing voltage with increasing throttle and two decreasing voltage with increasing throttle .
"If you live in New Mexico and you get invited to a costume party, don't go as a Mountain Lion; because you might end up getting trapped and skinned."
peace
Jack Handy
Thats what you see via live scanner data.Quote:
Originally Posted by sturgillbd
Two things I'm interested in,
1 Is this something that can be manipulated? Truck has been converted to manual injector pump and the leverage ratios between the manual pump and app don't align well.
2 What other inputs could affect the way TPS% gets calculated. Very strange problem I have with gear ratio error being set by erratic spiking TPS% decelerating between 30-20 mph when tipping back into throttle, yet APP voltages do not correlate.
Classic down right funny SNL stuff right there. Glad someone caught my jest.Quote:
Originally Posted by Hog