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Old 09-27-2013, 02:25 AM
Icucme4 Icucme4 is offline
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Join Date: Sep 2013
Posts: 2
Question I have this same problem

Quote:
Originally Posted by ace View Post
Thanks C32AMG.

You are correct about the o-rings, I have replaced those and so far the leaking seems to have stopped. I guess time will tell though.

I do not have the print out you are referring to and I do not know how I could get the read-out of the adaption values.
At this point it is hard to determine wheter the transmission is slipping or not , since it is not shifting. When I put it the selector in R it will go in reverse, P for park and N for neutral but regardless of whether I put it in 1,2,3,4 or D , the only forward gear it will go in to is 2nd gear. It does not shift up to 3rd, 4th or 5th, nor does it shift into 1st when I switch from the W to the S program. As long as it is in 2nd gear, it does not appear to be slipping but off-course it is most likely to slip in between gear-shifts, not when a gear is solidly engaged.

Here is the scenario. I disconnect the battery and/or I clear codes using my scantool (here is the link in case you are interested http://www.scantool.net/products/elmscan_iso.htm )
I start up the car, Check Enigne light will go off.
Now I would expect to see around 12 Volts when I measure on pin 38 of the TCM. Pin 38 is supposedly the common supply voltage for the solenoids (see attached schem1, wherein N15/3 is the connector on the TCM) but there is no voltage there.

This is what makes me think the TCM is not working right. At that point, I haven't put the car in drive or reverse yet, much less driven it since doing the reset. Even if there was something wrong with the Transmission (worn out or whatever) the TCM would not know it yet, at least that what I think.
Anyway , then I put the car in reverse or drive and immediately I can tell that it is shifting harsh. ( the remark about the TCM commanding maximum line pressure from your earlier post may support that).

I had the TCM rebuilt by autocraftdirect. I assumed it was bad because:

1- it had been full of oil, and I figured that metallic particles suspended in the oil could have shorted out a component.
2- I got a host of codes indicating problems with the solenoid valves. It seemed unlikely that all solenoids went bad at the same time, in addition, I measured the resistance of the solenoids and they are all in spec.
3-according to a troubleshooting chart I have, with the ignition on , pin 38 must carry 12 volts.

Now that I received it back from autocraft, the 12V is still missing. I called them , they really don't seem all that knowledgeable. They claim the TCM only provides ground, but that is not what the schematic indicates. They also could not tell me exactly which components they had replaced . I am wondering if they just replaced some of the most likely failing components of the board on the assumption that those would be the culprit.


So, my suspicion is that either :
-the TCM is still defective
-or somehow the limp mode is never cleared (does removing the battery clear the limp mode or is there some sort of non volatile memory that stores the codes and error conditions in spite of removing the power to the electronics?)
-or the limp mode is re-enabled as soon as I start up the car because there is some hard failure in the transmission.( this last option seems unplausible to me since as I said the 12 v are missing before I even take it out of Park).
-Can anyone confirm if the 12 v is supposed to come on to pin 38 as soon as ignition is turned on?

I have this problem happens intermittently and my tranny slips then won't shift at all - Have replaced TCM 3 times each time runs for 3 days to a week then electrical solenoid codes pop up - changed valve body 3 times, conductor plate 3 times, all the solenoids, and finally the wire harness from tranny to tcm and it worked for 2 weeks then after an hour in the car bam started slipping again. I suspect a relay that causes a surge in the tcm or a bad ground I need help any ideas? Almost ready to push it off a cliff lol
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