reflash P59 tac module
reflash P59 tac module
Question- has anyone ever successfully re-flashed the TAC module for a P59 truck?
Re: reflash P59 tac module
I don't know of anyone who has worked on flashing TAC modules.
What would you do if you could flash one?
What would you do if you could flash one?
Please don't PM me with technical questions - start a thread instead, and send me a link to it. That way I can answer in public, and help other people who have the same question. Thanks!
Re: reflash P59 tac module
I did a swap and try in a 2003 TAC truck with no issues beyond it was a different problem with the cruise control on the column.
Re: reflash P59 tac module
There seems to be a max idle TPS idle value I'd like to increase. Currently it appears it is around 25.7%. The PCM bin shows a little higher at 27.xx%...so maybe its that and I'm being limited by area or something else.NSFW wrote:I don't know of anyone who has worked on flashing TAC modules.
What would you do if you could flash one?
It would be really nice to have an idle airflow area DMA pid as well.... or at least a very clear understanding of how idle airflow is converter to area and is then converted to [ETC] TPS.
Basically I was working on tuning in a large 103mm TB and what I found out initially is that they flow like crap at very low TPS and therefore take large amounts of TPS at idle and startup on a big inch engine with lots of cam overlap.
Re: reflash P59 tac module
also, do you happen to know if a pcm can be recovered from messing with the ETC settings within the red folder of EFIlive? I bricked one after pissing it off by changing some of these settingsNSFW wrote:I don't know of anyone who has worked on flashing TAC modules.
What would you do if you could flash one?
It communicates fine, but won't accept the bootloader from EFI, winflash or pcmhammer. I can read the vin and clear codes...but they immediately reappear and the pcm is just in this deadpoll state.
edit- popped the cover off and grounded the reset pad and was able to write entire (clone) another P59 dump I have on it using PCM hammer. so back in business.
-
- Posts: 81
- Joined: Sun May 11, 2014 6:36 pm
- cars: Z06
Re: reflash P59 tac module
yes using boot pinRADustin wrote:also, do you happen to know if a pcm can be recovered from messing with the ETC settings within the red folder of EFIlive? I bricked one after pissing it off by changing some of these settingsNSFW wrote:I don't know of anyone who has worked on flashing TAC modules.
What would you do if you could flash one?
It communicates fine, but won't accept the bootloader from EFI, winflash or pcmhammer. I can read the vin and clear codes...but they immediately reappear and the pcm is just in this deadpoll state.
edit- popped the cover off and grounded the reset pad and was able to write entire (clone) another P59 dump I have on it using PCM hammer. so back in business.
-
- Posts: 81
- Joined: Sun May 11, 2014 6:36 pm
- cars: Z06
Re: reflash P59 tac module
There is... its 18.3% and yes I would love to get rid of it too. I wonder if its the same chip as the E38sRADustin wrote:There seems to be a max idle TPS idle value I'd like to increase. Currently it appears it is around 25.7%. The PCM bin shows a little higher at 27.xx%...so maybe its that and I'm being limited by area or something else.NSFW wrote:I don't know of anyone who has worked on flashing TAC modules.
What would you do if you could flash one?
It would be really nice to have an idle airflow area DMA pid as well.... or at least a very clear understanding of how idle airflow is converter to area and is then converted to [ETC] TPS.
Basically I was working on tuning in a large 103mm TB and what I found out initially is that they flow like crap at very low TPS and therefore take large amounts of TPS at idle and startup on a big inch engine with lots of cam overlap.
Re: reflash P59 tac module
I was stuck around 18% at one time, but I lowered the throttle body scalar and then hit this other limit around 27%. The 8.1L big block uses 26% in the pcm IIRC stock- so I just kept those values. Going higher bricked things- but yeah the reset pin trick and PCM hammer got me going again.Highlander wrote:There is... its 18.3% and yes I would love to get rid of it too. I wonder if its the same chip as the E38sRADustin wrote:There seems to be a max idle TPS idle value I'd like to increase. Currently it appears it is around 25.7%. The PCM bin shows a little higher at 27.xx%...so maybe its that and I'm being limited by area or something else.NSFW wrote:I don't know of anyone who has worked on flashing TAC modules.
What would you do if you could flash one?
It would be really nice to have an idle airflow area DMA pid as well.... or at least a very clear understanding of how idle airflow is converter to area and is then converted to [ETC] TPS.
Basically I was working on tuning in a large 103mm TB and what I found out initially is that they flow like crap at very low TPS and therefore take large amounts of TPS at idle and startup on a big inch engine with lots of cam overlap.
I've got good results with setting the scalar to no higher than .2 and then tuning the throttle area to TPS tables. I also drilled a 5/16" hole in the blade, and may drill another smaller hole. Warm idle tps is down to around 8%, I'd like to be at 4-5%. Motor runs great but would be nice for really cold starts to have more TPS available.
Re: reflash P59 tac module
Thanks for confirming that it's recoverable. I have a hunch - but don't know for sure - that the problem is that there are two copies of many of the tables and parameters used for ETC, and parallel code paths as well, and if both versions don't agree then the PCM assumes that something is wrong with the flash chip.RADustin wrote: also, do you happen to know if a pcm can be recovered from messing with the ETC settings within the red folder of EFIlive?
[...]
edit- popped the cover off and grounded the reset pad and was able to write entire (clone) another P59 dump I have on it using PCM hammer. so back in business.
If I'm right, you could probably edit those ETC settings and still have a working PCM, if you have an XDF that lets you modify both copies of the tables and parameters, and if you make identical modifications to both copies. CPersing's 7603 XDF has a bunch of the primary/backup table pairs defined. I haven't played with this stuff myself, but I think it's worth trying, if the parameter you want to change is in there.
Please don't PM me with technical questions - start a thread instead, and send me a link to it. That way I can answer in public, and help other people who have the same question. Thanks!
- Phoenix
- Posts: 112
- Joined: Sat Aug 22, 2020 5:02 am
- cars: 1983 Chevy C10
1993 Ford Mustang LX 5.0
2004 Pontiac GTO
2005 Pontiac GTO - Location: Anna, TX
Re: reflash P59 tac module
What OS are you using? I'm attaching an updated version of CPersing's 7603 XDF that has all of the ETC table defined. Look at the ETC Parameters that have "REDUNDANT" in the title. Some of them match exactly while others are double the value. I think what ever you change in the regular table must also be changed in the REDUNDANT table and follow the way they are laid out. IF they match, match them, if the REDUNDANT is doubled make sure that it stays that way with the new value. Since you are to recover the PCM if something is out of whack I think it would be an interesting experiment to see exactly what causes these issues.NSFW wrote:Thanks for confirming that it's recoverable. I have a hunch - but don't know for sure - that the problem is that there are two copies of many of the tables and parameters used for ETC, and parallel code paths as well, and if both versions don't agree then the PCM assumes that something is wrong with the flash chip.RADustin wrote: also, do you happen to know if a pcm can be recovered from messing with the ETC settings within the red folder of EFIlive?
[...]
edit- popped the cover off and grounded the reset pad and was able to write entire (clone) another P59 dump I have on it using PCM hammer. so back in business.
If I'm right, you could probably edit those ETC settings and still have a working PCM, if you have an XDF that lets you modify both copies of the tables and parameters, and if you make identical modifications to both copies. CPersing's 7603 XDF has a bunch of the primary/backup table pairs defined. I haven't played with this stuff myself, but I think it's worth trying, if the parameter you want to change is in there.
- Attachments
-
- 12587603 - Release 07-07-22.zip
- (170.97 KiB) Downloaded 178 times