Jim_PA

iTrader: (9)

So I bought this: http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWNX%3AIT

Pluged in the TAC and pedal, and same result. What do I throw money away on next? New PCM, new throttle body? Anyone want to take a guess??? My guessing isn't very reliable.

Can I flash my PCM with an '03 Silverado 5.3 HPT file??? Or wouldn't that help anything?

CalEditor

iTrader: (1)

Do any DTC's set?

Jim_PA

iTrader: (9)

I haven't been driving it much recently, but have not seen any. I'll check again though.

Jim_PA

iTrader: (9)

Ok, I have both PN's of TAC modules, 2 different APP sensors, 3 different PCM's, and 2 different pedal assemblies.

All combinations give the same result. I am starting to think this condition I am experiencing is normal???

Jim_PA

iTrader: (9)

I did a write-entire with a 2006 truck HPTuners file, and my pedal is working perfectly now.

Thanks to all who helped!

Jim_PA

iTrader: (9)

It's working at initial startup, but eventually goes into limp mode.

[PCM] P1125 - APP System (History) (Immature)
[PCM] P0102 - Mass Air Flow (MAF) Sensor Circuit Low Frequency (Old) (History) (Current) (Immature)
[PCM] P0103 - Mass Air Flow (MAF) Sensor Circuit High Frequency (Old) (History) (Current) (Immature)
[PCM] P1810 - TFP Valve Position Switch Circuit (Old) (History) (Current) (Immature)
[PCM] P2120 - Throttle/Pedal Position Sensor/Switch D Circuit (History) (Immature)
[PCM] P2125 - Throttle/Pedal Position Sensor/Switch E Circuit (History) (Immature)

I think there must be a wiring difference between 04 and 06.

Anybody have any ideas?

CalEditor

iTrader: (1)

Hey can you get me the PCM service number?

Jim_PA

iTrader: (9)

VCM ID: 2NA1E5ZB6087
VCM OS ID: 12606807
VIN: 2GCEC13V061329336

Segment 1: 12606807
Segment 2: 12606699
Segment 3: 12591401
Segment 4: 12591450
Segment 5: 12606606
Segment 6: 12591494
Segment 7: 12591524
Segment 8: 12606724

Controller: P59

Seed: 5A9B

CalEditor

iTrader: (1)

Look for a # on the PCM like one of these
9354896 – 1999 & 2000 512kb
12200411 – 2001 & 2002 512kb
12576106 - 2003 G-VAN, C-TRUCK LM7 1mb
12582605 - 2003 C-MPV, 1mb
12586242 - 2004 C/K-TRUCK, 1mb
12586243 - 2004 GTO LS1, 1mb
12589463 - 2005 C/K-TRUCK/MPV, 1mb
12589462 - 2005 G-VAN, 1mb
12589463 - 2006 C-PICKUP, 1mb
12602802 - 2006 C-PICKUP, 1mb
12602801 – 2006 & 2007 Express, 1mb
12582811 – 2007 PICKUP 1mb

Jim_PA

iTrader: (9)

Service number: 12576106

Hardware number: 12570558

But it has the 2006 OS inside it.

CalEditor

iTrader: (1)

Can you give me all the details to the truck? 2wd or 4wd also. Gear ratio all mods.

Can you post the calibration details for HPT fo the 2003 OS?

Jim_PA

iTrader: (9)

1968 C10 (2wd), T56 3.73 rear 295/50/15 tires
2004 LQ4 78,000 mile stock bottom end
New LS2 (243) heads
Lunati Camshaft: VHRX278-12X 278/282 adv. 227/231 @.050 .651/.651 112/108 LSA/ICL
GM Lifters
Stock intake with returnless fuel rail
Delphi 8.1 Marine Injectors
NGK TR55ix plugs, MSD wires
Walbro 255 inline fuel pump with Corvette style filter/regulator
Homebrew 1 3/4" headers

Running in SD mode, no MAF - I have 2 factory O2 sensors in place, but not sure if I'll use them.

Using a wideband controller for SD tuning

The 2003 OS details are as follows:

VCM ID: 2CC1C3W52286
VCM OS ID: 1271050
Segment 1: 1271050
Segment 2: 12577909
Segment 3: 12580651
Segment 4: 12572454
Segment 5: 12572475
Segment 6: 12572493
Segment 7: 12572587
Segment 8: 12572529

Controller P59

Seed: 07D6

The first file is based on the 2006 stock file

The second file is based on the 2003 stock file

CalEditor

iTrader: (1)

I will build you a 6.0L T56 Calibration that matches your VIN, VCM ID, and the original OS. Then you can switch it up for the SD OS. This will not cost you any credits at all. I will do this in a Hex-Editor. At no fee

Jim_PA

iTrader: (9)

That's awesome man -- I kind of wish we knew what the problem was (rather than needing to do all the hex editing). I'm aware of 2 other people with all matching components that have fought the exact same issue.

http://www.performancetrucks.net/for...=472188&page=4

Do you have everything you need from me?

If I can ever help by writing a program or something to help with this process, let me know -

Jim_PA

iTrader: (9)

After looking at how my foot hits the pedal in the Yukon, it's pretty obvious that the pedal is designed to use only some of your foot motion to actually move the pedal arm. A good portion of your foot movement just gets used up by changing the angle of the pedal pad. If I were to just use the tip of my toe to push in on the bottom of the pedal, or lock-out the pedal pad movement, it would probably feel pretty sensitive.

The way my pedal is mounted in the truck, using the pedal with my foot transfers all the movement to the pedal arm, and none of the motion goes towards flexing the pedal pad.

I'll have to try to take that into consideration when trying to re-do my pedal. It will certainly take away some of that over-sensitive pedal sensation...

So, here's what I've learned (I think anyway...)

Adjustable pedals have significantly less overall mechanical travel than a fixed pedal setup.

The PCM must have a setting somewhere that tells it how much mechanical movement the pedal has.

I think 2 of my calibrations are for adjustable pedals, and the 2006 file I got from bowtieguy79 is for a fixed pedal.

Putting a fixed pedal on a PCM calibrated for adjustable pedals results in 100% butterfly opening at about 50-60% of the pedals range of motion. Holding the pedal past the point where the PCM thinks WOT is results in reduced power mode because the pedal is reporting motion that is out of the range of what the PCM is configured to use.

I imagine if you'd put an adjustable pedal on a PCM calibrated for fixed pedals, holding the pedal all the way down to it's full extent would result in about a 60% butterfly opening.

The APP sensors in the pedals are the same, the TAC modules are the same (as long as your TAC module is within the same range of years...), the mechanical pedal assemblies are different (adjustable vs. fixed pedals) and the PCM calibration needs to match the amount of motion your pedal has.

I have no confirmation of this, but if I could check the 3 vins I have, it would confirm that 2 of the builds came with adjustable pedals, the third did not.

I have about 4 months of research and lots of trial and error invested in making this discovery And now I feel even dumber than when I started.

Hopefully my discovery will help some other poor sap that is torturing themselves with this issue like I was.

So, if I'm right, all we need is a new setting in HP tuners that defines the amount of pedal travel available

CalEditor

iTrader: (1)

I have found that the 03 and 06 have more than a few differences to the TAC parameters.

I will stop working on your bins and find a fixed pedal bin and start on it. I think I have one for a Train Vehicle. I wouldn't think it had adjustible pedals

Jim_PA

iTrader: (9)

Can't thank you enough! -- Let me know how it goes

CalEditor

iTrader: (1)

I had a 04 in the shop and I didn't see anything that would change the APP sensor position when you run the pedals up and down.
I can tell you that the 03 is much more aggressive in the Throttle rotaion vs APP rotation than the 06

Jim_PA

iTrader: (9)

Well, I'd be willing to bet that it's different because the 03 came with adjustable pedals that had less overall pedal travel, whereas the 06 came with the fixed pedal that has a lot more mechanical travel.

Jim_PA

iTrader: (9)

I have a friend with a 2500 silverado/6.0 work truck that probably doesn't have adjustable pedals. I could go and pull his tune and try it, but I don't have any credits left to flash back with

Edit: Yep, it's confirmed, he has a fixed pedal. Wish I would have thought of this long ago, I wasted all my credits licensing and flashing hpt files that are of no use to me.