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The 1997 model 4L60E Units have 2 solenoids responsible for the operation of the hydraulic circuits for TCC apply and release operation.
Have the solenoids, the internal wiring, the external wiring, and the PCM been looked at yet?
You wouldn't happen to have a diagram showing their locations by any chance? Ill go back through my manual and check.
I did command the PWM solenoid with the tech2 and i can hear it 'click'. I also applied a 9v battery to the terminals and it clicks. I also used a 9v battery to the TCC solenoid that goes into the pump - are they the two solenoids your referring to? - both of these checked out. Also checked resistance ranges and they were in spec.
Note this problem was not present before the rebuild, so its an issue i've introduced somehow.
Did you get a "new" TC?
If it's commanding and solenoids are clicking and fluid is full, it almost sounds like a bad converter...
I'm far from an expert though
Did you get a "new" TC?
If it's commanding and solenoids are clicking and fluid is full, it almost sounds like a bad converter...
I'm far from an expert though
thats what I'm thinking. Fluid definitely full. The TC I got was rebuilt, trying to decided weather to pick up another one and risk it or to throw in the towel =/
Tell him to just take it apart and figure it out... good GUESS on the tcc reg valve though, funniest **** ive read all day.
I installed the sonnax TCC reg valve fix, reamed the boar. Initially I assumed I must have done a bad ream job but after vacuum testing the ports in the valve body its come back fine.
If you have the sonnax tcc and it vac checks good then ignore my comment on the fitzall valve
With the tech 2, can you see the pwm duty cycle that is commanded?
How do you have the valve lined up in the pump?
Did you install new solenoids? The solenoids seat with very small pintles and even if they ohm test ok and "click" they may still not work right.
If both valves are in correctly and vac check well, and both solenoids are good, and the o ring was on the shaft...then you're looking at a short lift of issues left.
Most likely being a DOA converter. Which is pretty odd.
I've attached the entire fluid circuit for the TCC lockup...it is fairly simple...and you've eliminated most possible issues.
Good luck
If you have the sonnax tcc and it vac checks good then ignore my comment on the fitzall valve
With the tech 2, can you see the pwm duty cycle that is commanded?
How do you have the valve lined up in the pump?
Did you install new solenoids? The solenoids seat with very small pintles and even if they ohm test ok and "click" they may still not work right.
If both valves are in correctly and vac check well, and both solenoids are good, and the o ring was on the shaft...then you're looking at a short lift of issues left.
Most likely being a DOA converter. Which is pretty odd.
I've attached the entire fluid circuit for the TCC lockup...it is fairly simple...and you've eliminated most possible issues.
Good luck
Thanks for your help!
Yes I can see the PWM duty cycle, it goes up pretty quick after 4th gear is engaged (after it reaches operating temp), basically it goes 25, 50, 75, 99. Regardless of the duty cycle commanded, the slip speed stays the same - anywhere from 100 to 180ish rpm depending on throttle applied. I replaced the PWM solenoid as part of the rebuild but not the tcc solenoid as that requires a full wiring harness replacement (although maybe I should do that as part of troubleshooting).
The TCC apply valve in the pump is just installed as stock, i took it out like three times to be sure it was orientated correctly.
I think i'll replace the wiring harness, torque converter then re-install and go from there.
If that fails then ill give up and take it to a professional.
Did you ever check wiring?
Just piggyback into the harness and ground the TCC solenoid with a switch in the cab. The computer can command it all day but if the signal never makes it to the trans...it's not going to matter
Did you ever check wiring?
Just piggyback into the harness and ground the TCC solenoid with a switch in the cab. The computer can command it all day but if the signal never makes it to the trans...it's not going to matter
I will try doing exactlly that this weekend.
I can command the TCC solenoid using the tech2, when I do that with the engine off I can hear it 'click' - I know thats not a sure fire way to tell its working but it suggest its not a wiring issue. Regardless, i'll wire a switch into it and piggy back it to a 12v wire and see if that makes a difference.
Took it for another drive with tech2 recording. At wot the tcc slip speed goes up to 500ish, is that normal? I'm wondering if its actually slipping in 4th gear or if it's just the tcc.
At highway speed the tcc slip is around 200ish sometimes a bit more If there's a bit of a hill. (After tcc is commanded on)
Regardless, there's definitely no lockup even when the computer commands it in 3rd gear.
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4L60E no TCC lockup 
