Deep 6.5 thoughts by Jack Handy

[brian617]

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?

[Fast355]

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.

[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?

[ony]

this is intreging a little,spent 2-4 hours laying on my belle changing pumps down in texas. wisdom in motion

[brian617]

That's it? No deep explaination, I know there are some great minds on here.

[sturgillbd]

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 .