I experienced a great deal of success with my AW55-50sn rebuild project, new friction plates, seals, transfer gear bushing, proper selective shims, and Transgo VB kit... new ATF cooler and inline filter, new torque converter, new 3309 fluid, etc. all dial indicator measurement specs were bang-on what the service manual expected me to have during re-assembly.
First key on/engine on test after topping up ATF and coolant was a success, VIDA was satisfied other than a bad contact reel causing SRS codes (pre-existing condition, not caused by my service)
Put 35 miles on the car slowly at first, checked fluid levels again (good) and then ran highway speeds, everything worked properly and the shifts felt excellent and solid- not banging or slipping, no mechanical hiccups whatsoever. No check engine or MIL codes (other than SRS) it got me to the cornfield so I could finish discing and tilling, and then I drove it home, again with no issues. I was a happy mechanic!
...until the next day, I was out in the shop putting the wheel well plastic and bumper back together and I fired it up to turn it around. while idling, my Gear Selection Indicator went to a dash after 10 seconds, followed by a red warning light w/ message that says "Trans service required"
Vida says TCM-0117 SLT Signal Missing, Permanent. So, I grab my ohm meter and start checking the VB wiring harnesses pins via the guide in VIDA- and poof, it seems I have an open circuit for that solenoid.
Even weirder, after verifying that the four wiring harnesses from trans to chassis have clean and solid connections, I pulled up a reading for the SLT solenoid- vida forces an oscillation between 0 and 1000 ma, but mine stays flat dead at 0.
My parents have an 07 V70 XC, so I put vida on it and ran a graph of all three solenoids, here it is-
- 2007 v70xc solenoid graph
On my car, all three are flatlined at 0 amps while performing the same task.
I'm really saddened and confused, as everything worked perfectly during my initial run, and during my trip back home (70 mi round trip). What could have possibly happened in the time the car sat in the shop overnight? I've double and triple checked my wiring harness connections, but it's looking like I get to pull the pan and install new solenoids...
It is also interesting to me that I only have the TCM0117 for the SLT solenoid when VIDA is showing no sign of life from the other two solenoids as well. What the hell! Are these solenoids really that finicky? Bench test showed the proper Ohms before and after I cleaned and rebuilt the solenoids, and for the entire day, functioned properly.
If anyone has an idea, a thought, or advice, I would greatly appreciate it if you could chime in. I've been up all night scouring for similar issues, but no results are as detailed and thorough as this post I am creating now. I suppose I can install new solenoids, but that doesn't explain WHY they worked flawlessly one day and not the next...
...back to the shop I go! thanks for reading my essay!
