4L80E converter not locking..
4L80E converter not locking.. 0411 PCM
Custom harness
LQ9
"96" 4L80E
FTI 3K lockup converter.
Tuner setup converter to lock at 45mph, it won't lockup on it's own. However if he commands it to (using HP tuners) it will lockup.
I've verified my TCC relay is wired properly. Purple 33 has keyed 12V, once brake is applied the power goes away.
Fluid level is correct.
Trans is a junkyard pullout, they told me it worked properly. I'm inclined to believe them, as it shifts phenomenally and doesn't slip.
Where should I start? I presume this is either a tune issue, or an internal trans sensor issue.
Thanks in advance...
Custom harness
LQ9
"96" 4L80E
FTI 3K lockup converter.
Tuner setup converter to lock at 45mph, it won't lockup on it's own. However if he commands it to (using HP tuners) it will lockup.
I've verified my TCC relay is wired properly. Purple 33 has keyed 12V, once brake is applied the power goes away.
Fluid level is correct.
Trans is a junkyard pullout, they told me it worked properly. I'm inclined to believe them, as it shifts phenomenally and doesn't slip.
Where should I start? I presume this is either a tune issue, or an internal trans sensor issue.
Thanks in advance...
I've got another thread in the tuning section, and as far as I can tell based upon peoples suggestions the tune I have currently should lock the converter.
However it still won't lock on it's own, but will when commanded..
Is there anything internally, or sensor related that could be holding the transmission from doing it on it's own?
The fluid level is ok, I presume the solenoid for the TCC is fine since it can be commanded on.
Anything?
I've attached my current tune also.
However it still won't lock on it's own, but will when commanded..
Is there anything internally, or sensor related that could be holding the transmission from doing it on it's own?
The fluid level is ok, I presume the solenoid for the TCC is fine since it can be commanded on.
Anything?
I've attached my current tune also.
You have many of the transmission dtc's set to no error reporting. They need to be set to 1 mil on second error. These are tcc, vss, fluid over temp, shift solenoids 1-2 3-2, anything pertaining to an auto transmission needs to have error reporting active or it won't lock the converter. Look at my tune and compare it to yours. Mine locks the conveter likes it supposed to.
I essentially copied your trans diag section into mine.
Then turned on anything that involved the trans in the DTC center, drove to a job site I'm at today no lockup.
scanned for codes, giving me a P0705 (range switch)
I'm using an aftermarket floor shifter, and when my harness was built it didn't include provisions for wiring a neutral safety switch into it.
So, I deleted the codes, turned them off via the program (p0705,p0706)
Guess we'll see what happens when I leave the job.
Then turned on anything that involved the trans in the DTC center, drove to a job site I'm at today no lockup.
scanned for codes, giving me a P0705 (range switch)
I'm using an aftermarket floor shifter, and when my harness was built it didn't include provisions for wiring a neutral safety switch into it.
So, I deleted the codes, turned them off via the program (p0705,p0706)
Guess we'll see what happens when I leave the job.
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I've verified my TCC relay is wired properly. Purple 33 has keyed 12V, once brake is applied the power goes away.
I've verified the switch is adjusted properly as well, it doesn't hang and complete the circuit until the pedal is depressed.
I've verified the switch is adjusted properly as well, it doesn't hang and complete the circuit until the pedal is depressed.
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iTrader: (10)
Joined: Apr 2009
Posts: 1,230
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From: Joliet,IL and Las Vegas 50/50
Mine locks up and I'm using a bin swapped hpt file and speartech harness. Update your HPTuners to the latest version of the software. It will give you additional tables to change. This was my issue and after the update all was well. To see if you have the version that has those tables take a look in Transmission->Auto TCC
If it doesn't look like it has the same tables as below. Update hpt
If it doesn't look like it has the same tables as below. Update hpt
Have you isolated the issue to the tune file or wiring? I thought you stated earlier that you could force lockup via HPT.
If it's the tune file, I suggest, downloading a stock 80e file and importing all the trans settings into you file, and then using the speedometer tool. To adjust for your gearing and tires.
Have you tried anything like that or am I totally off the mark?
If it's the tune file, I suggest, downloading a stock 80e file and importing all the trans settings into you file, and then using the speedometer tool. To adjust for your gearing and tires.
Have you tried anything like that or am I totally off the mark?
I'd like to believe the issue is in the tune, lockup can be commanded, and ive verified my tcc relay is wired properly.
I haven't gone as far as copying a 100% stock tune, but I've copied tables from different peoples tunes trying to get somewhere.
I haven't gone as far as copying a 100% stock tune, but I've copied tables from different peoples tunes trying to get somewhere.
Why not try a stock tune? What's it gonna hurt? You started this thread 28 days ago.
That would eliminate the software portion of the equation.
So, It is either the hardware in the PCM, the PCM file, wiring or the trans. Use the process of elimination that does not cost any $$ and does not require and physical effort.
That would eliminate the software portion of the equation.
So, It is either the hardware in the PCM, the PCM file, wiring or the trans. Use the process of elimination that does not cost any $$ and does not require and physical effort.
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Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
If you can command TCC lockup with a scanner, it is extremely unlikely to be the trans or even the wiring. The PCM is simply never "deciding" to enable lockup. It is either the tune, an engine sensor or a code.
You never mentioned that the car was scanned for codes; not all codes turn on the MIL light.
You never mentioned that the car was scanned for codes; not all codes turn on the MIL light.
From my understanding in order for me to reflash the truck with a 100% stock LQ4/4L80 tune it would require me to use (buy) 2 more credits. I have a surplus of 6, but I'd rather not waste them if there's no need.
Only codes I get are the lack of MIL wired up, I kept getting a code for lack of range sensor (P0705) but I since went back into the tune and turned off that code.
On the engine sensor topic, my dad keeps saying the trans needs a certain amount of vacuum in order for it to lockup. From what I've gathered it's entirely based upon speed and the TPS. I've got a spare for almost every sensor except for the MAF and have no issues swapping them out, I genuinely don't know which would affect it.
Possibly the MAP?
Only codes I get are the lack of MIL wired up, I kept getting a code for lack of range sensor (P0705) but I since went back into the tune and turned off that code.
On the engine sensor topic, my dad keeps saying the trans needs a certain amount of vacuum in order for it to lockup. From what I've gathered it's entirely based upon speed and the TPS. I've got a spare for almost every sensor except for the MAF and have no issues swapping them out, I genuinely don't know which would affect it.
Possibly the MAP?
Download a stock 80e file from the HPT repository. Open your existing file and then compare the two and then import the repository 80E settings. Change the speedo settings for your gear ratio and tire size and save your new file. Upload it to your PCM and test for proper lockup. It should not cost you any additional credits.