mille_3

iTrader: (1)

Took the firebird out today for it's maiden voyage before I hand the car over to my kid for his graduation present (He doesn't know).

I'm having some issues with the tranny (4L60E)shifting properly, or should I say shift at all. I was expecting some issues as I accidentally lost track of a pair of wires (2xblack/yellow and 2xpink) when I was extending them. I just need some input on which ones to switch around.

Here are the symptoms. It seems stuck in high gear, I'm guessing 3rd. Is it more likely that this is caused by having switched pin B and pin L around or by pin N and E being switched around? Or a combo of both? Please see attached diagram. I would really appreciate some help as I'm running out of time to have the car ready for my kid.

Pocket

iTrader: (22)

The linked diagram isnt enough, the PCM positions arent shown. If the pinout is like 2004 green/blue then the 4L60E wiring is just like common red/blue LS1 PCMs
http://www.lt1swap.com/2004vortec_pcm.htm

Unplug the trans connector and do a continuity test from the individual pins to the PCM. Most likely you got 2 switched. You already repinned it to convert 4L80E to 4L60E so this should be cake. Hardest part is to stretch your meter leads out by yourself

I attached my check list for 4L60E's to cut out the rest of the stuff. There is an error though, Pin S shows B78, its actually B79

mille_3

iTrader: (1)

Hey Pocket. I have the pins correct at the PCM, but I lost track of them at the tranny when I cut the wires to extend them after I already had the harness in the car. Just trying to figure out which pins at the tranny are the most likely culprit without having to put the car on stands multiple times.

the_merv

iTrader: (88)

Does the 6.0l Tune still have the stock 4L80E Parameters in it, or was it tuned with a Segment Swapped Tune?

mille_3

iTrader: (1)

The PCM has been re-tuned.

mille_3

iTrader: (1)

Ok so in essence what I am wondering is if I swapped the 2-3 Solenoid pin and the TFT Sensor pin around, would that cause the transmission to stay in 3rd? The other 2 pink wires shouldn't matter I'm guessing as they are 12V+.

Pocket

iTrader: (22)

Pin E PNK is IGN for all the solenoids
Pin N PNK is switch A which controls internal pressures

Pin B YEL/BLK is 2-3 shift sol
Pin L YEL/BLK is trans temp signal

I really dont know much about internal trans functions but looking at the diagrams, a swapped pink wire would mean NONE of the solenoids work. A swapped YEL/BLK should show up on a good scanner that shows real time data. A trans temp of anything should mean the YEL/BLKs are good. No temp signal or constant 0* means they're switched

mille_3

iTrader: (1)

Ok. So with that info in hand I can assume that Pin E and N are correct since the transmission shifts into reverse? and Pin B and L need to be swapped around. I'll swap B and L around and report back.

the_merv

iTrader: (88)

For a 4L60E?


Here is a Diagram for the Connector..does your wiring match this? Disregard the colors, but function is correct.

mille_3

iTrader: (1)

Yes, it's been re-tuned for a 4L60E. And yes it matches what you have posted. Except B and L more than likely are switches around in my case.

Pocket

iTrader: (22)

According to this thread, reverse always works
https://ls1tech.com/forums/automatic...-pls-help.html

Once you actually crawl under there, see if you've got 12v IGN on pin E. That'll put it to bed

the_merv

iTrader: (88)

Yea we just had a truck come through the Shop where the 12v wire going to Pin E got severed somewhere in the Harness..wired in another 12v, worked like new.

mille_3

iTrader: (1)

Thanks guys. It's going to have to wait until the weekend for me to check this out. I'll report back and let you know. Thanks for the tips.

G-Body

iTrader: (4)

Sounds like you have pin E miswired for sure. If pin E is not getting 12 volts you will be able to drive the car and reverse will work but if you put it in overdrive or drive it will always be stuck in 3rd gear. However you can manually pull it down into first and then manually upshift into 2nd and 3rd.

mille_3

iTrader: (1)

That would make sense. I tried getting at the tranny plug last night but with the new y-pipe there is no way to get to it without dismantling the exhaust. I'll get at it at the PCM instead. Based on what you are saying I have E and N switched around for sure.

When I swap those two pins around, what would be the symptoms if the 2-3 Solenoid and TFT sensor were swapped around as well (Pin B and L)? I'm asking because I would hate to have the transmission trying to shift into all kinds of gears at the same time and ruin it.

the_merv

iTrader: (88)

Pin E is not powered from the PCM, it's from the Fuse Box.

mille_3

iTrader: (1)

Yes, I just realized that by tracing the wire through the wiring diagram...Looks like I have to take the exhaust apart regardless to get at the tranny plug. Not looking forward to it.

G-Body

iTrader: (4)

I`m not sure what exactly would happen if B and L were swapped. My guess is that the trans would not shift from 2nd to 3rd. I would just double check the wires with a volt/ohm meter when you have the plug apart to swap the other wires. It would only take a couple minutes.

mille_3

iTrader: (1)

Got the wires switched around. Turns out it was indeed E and N that were switched around, but won't have a chance to test since we just got another 4" of snow and another 2" on the way....

mille_3

iTrader: (1)

Had a chance to take the car for a quick spin. Now I'm getting 3 codes:

P2761 - Torque Converter Clutch Pressure Control Solenoid Control Circuit/Open
P0740 - Torque Converter Clutch Circuit Malfunction
P0785 - Shift/Timing Solenoid Malfunction

Checked the voltages of Pin N and E. Pin N is 12V+ with ignition on (not running) and Pin E is only 3.6V with a small residual voltage with ignition off, what could be causing such a low voltage? I'm guessing this is what's tripping the codes. I need some ideas guys.