Hello everyone. I have an issue with my truck not wanting to go into lock up. I've been working on this for about a week and have had limited success. I'll attach a log and my tune as well. Vehicle is a 2001 Silverado 1500 5.3/4L80 with stock converter that came with trans. P01/12202088OS So a couple of notes on what I've tried so far and the results:
-HPTuners shows the PCM is commanding lock up and shows to going through the normal TCC modes
-Could be just me but it seems more able to lock up when trans temps are on the cooler side (Normally runs 114 to 140 depending on outside temps)
-I tried using a switch with a light to manually ground the TCC wire (Pin S) and when on the light illuminates so I know it is getting power but had limited results (Locked up once and held until I turned off the switch when I coming to a stop)
-Converter is the original converter which came with the 4L80e. I was waiting to make sure that the trans runs good before ordering a Circle D 3200 with lock up
-When manually commanding lock up in HPT with truck off, I can audibly here the TCC solenoid operating
-Fluid levels are correct when warmed up
-All gears work well and no code (other than the before mentioned p1870 Trans Component Slippage from converter still unlocked when PCM commands locked)
I'm really leaning toward the converter clutches just being shot but if someone could look through the tune and data log and double check me I'd appreciate it. Thank you.