P59 Desired Pedal Area - Alternate

[G-Body]

Does anyone know of a way to trigger the PCM to use the Alternate desired pedal area table? I`m guessing it has to do with traction control? I had hoped that it had to do with the normal vs performance mode transmission shifting strategy, but that does not seem to be the case. I`m running the 07 van OS 12613248 but I am willing to make some adjustments or switch to the 603 OS if someone knows how to do it there. Basically I am looking to be able to flip a switch to slow down the throttle opening rate and limit the max opening of the throttle. Based on the screen shot of the 2618 2005 OS that should work if I can figure out how to select the table.

[antus]

Does the description field against the alternate table in efilive tell you? That is where I would expect it.

[G-Body]

Thank you! I didn`t even think to check EFI Live 7 cause I really haven`t ever used it. Now I just have to figure out why it didn`t seem to activate that table when I went into tow haul mode (via grounding pin 71 as there`s no BCM in my boat). I had kinda figured that table would be activated by tow/haul but it didn`t seem to work when I tried it on the bench.

[antus]

Is the platform set to GMT800? Ive not done this but I recall a list of hardware features by platform then somewhere then a scalar to pick which platform.

[gametech]

Just to be clear, that switch is momentary on factory setups. Not sure what will happen if you just leave the pin grounded.

[G-Body]

I`m not sure if I was using the GMT800 platform code of not, I had tried it on multiple bins. I know one of them was the GMT610 van platform code. I loaded a stock 2005 GMT800 bin into my test PCM, flashed it over to 1 switch for the performance mode as the 05 GMT800 tahoes only go to 65% desired pedal area on the alternate table. When I tried it a couple minutes ago it would open the TB 100% no matter how many times I tapped the blue pin 71 wire against the ground bus. I did notice that on my HPT scanner from the time that I powered up the PCM until I disconnected it always said "yes" in the trans performance mode column. I swear it normally switches back and forth between yes and no when I would tap pin 71 to ground on my bins that I had set up for tow/haul / performance mode. I`m going to have to try loading a 2003 GMT800 file in that I know worked with the pin 71 tow/haul mode button and see if it switches between yes and no on the performance mode column.

[G-Body]

Looks like I will have to wait until I get the boat out or step up my test bench significantly. I tried with a 2003 OS that I know the tow/haul button worked on and still could not see it switch to the tow/haul mode on the HPT scanner or my tech II. Went outside to the car that has the 2003 OS and tow/haul button on it and could not see it switching on the scanner or tech II.....until I started the engine, then I could see the switch. I don`t really want to risk bricking anything on that car by significantly altering the desired pedal area - alternate table so I`m either going to have to wait until the boat is out or build a virtual engine for the test PCM.

I`ll post back when I get a chance to test further. Thank you for all the help so far.

[G-Body]

I was able to do a little testing on the boat yesterday and found a few things out.
1. I cannot get the scanner to display what shift tables/throttle tables it is using. Once as I flipped the key on it flashed normal for a second then went back to --- . I think that because it does not see a transmission it does not display the transmission shift mode.
2. It will not run correctly if I copy over the alternate table from an 2005 tahoe OS to the 2007 van OS. They are different TAC PN`s, but I wasn`t expecting it to be as unhappy as it was being that I can swap a 03-05 TAC module into the system and it will run fine. That being said I cannot swap a 03-05 OS or 03-05 OS and TAC module in without it refusing to run. Now that I am thinking about it I am going to have to try swapping a 03-05 TAC module in and running the 2005 Tahoe desired pedal area - alternate table on the 2007 van OS.

[NSFW]

It's my understanding that each OS requires a particular TAC + pedal. All three need to align. But I've only heard of two combinations, like the 7603 OS works with the 03-05 TAC and pedal, and some OS's use the 06+ TAC and pedal. So your 07 van OS would need the later TAC and pedal, or you'd need to switch to an earlier OS to keep using the earlier TAC and pedal.

There are two copies of the "alternate" pedal response table, and you need to update both of them or the PCM goes into panic mode. Does HPT give you the ability to edit both of them? If not, that'd be another reason to switch to 7603 - the XDF has both copies of the table defined.

[G-Body]

Is that the Tunerpro/EFI live B2307 and B2308 tables? I have access to both of those, I was attempting to modify the B2308 table. Or is there duplicates of both of those tables? I didn`t see duplicates of the B2307 and B2308 in tunerpro or EFI Live 7 for the 7603 OS. I used to think the B2307 and B2308 had to match eachother, but then I stumbled across the .bin for a 2005 chevy Tahoe and they are wildly different in that application. IE 100% max pedal is 65% throttle opening on the alternate table, which is what gave me the crazy idea that maybe I could use this to limit my max throttle opening with the flip of a switch...well ok momentary push button.

The TAC module / OS compatibility gets really weird. 03-05 trucks all use the same TAC module PN, but the 03`s use 3 APP sensors, the 04`s may or may not have all 3 sensors physically on the pedal, but only use 2 of them. The 05`s seem to only have 2 sensors installed on the pedal. If you really want to fall down the rabbit hole the 2005 12592618 P59 OS will use the 03-05 TAC module in the trucks, but in the 2005 CTS-V it uses the 19245405 97-04 corvette TAC module. So somehow the 2618 OS will work with both the old style all plastic TAC and the new style plastic with aluminum TAC module. When looking at the PN`s just now I also discovered that the 7603 OS uses the new style 03-05 TAC module in the trucks and the old style all plastic TAC module in the vette.