So it seems that the current virus situation has some unintended benefits, I have more time to mess around with this problem child. I need a new game plan, any suggestions would be appreciated. Other than the one solenoid code, there are no other signs of faults. The problem is I have not been able to determine why it would be in a fault strategy. So the big question is, What is causing these incorrect commands? If it's commanded to start off in 3rd gear I'm thinking it may be in some sort of fault strategy. I had noticed it doing that intermittently also. The tech driving it said that sometimes it would start off in 3rd gear and 3rd gear was being "Commanded". The transmission shop replaced solenoid C but the problems remain. This is solenoid C during a normal shift to 3rd gear. I have some thoughts about it but it's just guess work at this point. The erratic up and down shifting is a little more unclear. The first VSM file is during the normal shift, the second is during a delayed shift and the other 2 are during very erratic upshifting and down shifting.Ī sticking solenoid causing a delayed shift to 3rd makes sense. If anyone else has had success at this I would love to see the waveforms. It may be possible with a far more sensitive amp clamp perhaps. They control the flow of fluid through a range of movement by PWM, so I think without the quick snap back and forth of a conventional solenoid, it may not be possible to see pintle movement.
#5r110w transmission wont shift out of 1st full#
These are not full on or full off type solenoids. I suspect this is due to the type of solenoid and control strategy being used.
I don't ever see any signs of pintle movement. During a delayed shift to 3rd I saw the solenoid energized for several seconds before the trans finally slammed into 3rd. While watching the scope during a normal shift, the trans shifted to 3rd as soon as I saw the solenoid energized. I think I have seen enough to condemn solenoid C. Most importantly I need a better game plan to track this down. I would like to hear any ideas you might have. I suspected a valve body or solenoid issue but when watching all the solenoids in scan data, it appears that they all activate appropriately for whatever gear is commanded and the gear changes actually take place. I monitored mode 6 looking for any sign of misfires and saw nothing when the faults occur (or ever). The PCM has run and passed all monitors except EVAP.
I have monitored the range sensor and other data and cannot see any anomalies that coincide with the faults. I have scoped the turbine sensor, intermediate sensor, output sensor and never saw any glitches or drop outs. That suggests to me there must be an input problem. Now looking at scan data it appears to me that when the erratic shifts happen, they are being commanded. They have never returned even though I have duplicated the problem numerous times. I recorded the data and cleared the codes. It stored codes P0761 Shift solenoid "C" performance and P2702 Friction element "C" apply time performance. Early on in my driving and testing the truck acted up very badly for a stretch and the wrench light came on. The Trans shop said they never saw any fault codes stored. I keep accelerating more and more and finally it will skip 3rd and slam into 5th. Also, when the problems start it will often times hang way to long in 2nd gear. Sometimes it will throw a downshift for seemingly no reason, then it may throw an unintended upshift or go down up down or up down up etc. The symptom is, after driving for several miles, the transmission will start to shift erratically. I will post what I have tested so far and hope that some one can give me some direction on what to test next. I have never done any diagnoses on one of these before now, so it's a learning curve. This has the 5R110W torqshift transmission. After spending a lot of time on this I see now why they pushed it off on me. Got this beauty from a local Transmission shop I'm friends with to diagnose a Transmission fault.
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