Well, you were right! My particular model isn't supported on this scanner for accessing the TCM. (Gee, why not??) So I will be returning it.
Anyway, I took it to a friend with a Snap-On Solus ultra and we pulled the TCM codes. Had no problem communicating, there were TONS of codes stored. At least 15 in the TCM alone! Cleared them all, only one came back, a code for the "Transmission Temperature Sensor" which appears to be stuck at 210F degrees. Shorted wiring to it??
After codes were cleared it would shift somewhat normally, but still harsh into drive, and didn't really feel "right". It shifted kind-of "ok" for about a half mile then went RIGHT back into limp mode. At first I could just turn it off and then back on, then it was stuck again after about three cycles. I didn't notice any slippage or anything like that, and it was shifting, just not properly. It would shift late, and jerk into first when coming to a stop.
So, NOW my question is, would a bad temp sensor cause these types of issues/limp mode? I couldn't go back and scan again after driving to see if anymore codes came up since he had closed up shop for the weekend.
Quote:
Originally Posted by TimFreeh
The lateral acceleration error code is being generated by the ESP system, it has nothing to do with the TCM problem or the limp-home mode.
I don't think there is a 'dead TCM' code but even it there were you'd have to get in contact with the TCM to determine it its dead right? The fact that you can't establish communications with the TCM means one of two possibilities
1) the TCM is dead or the wiring to it is faulty. BTW the wires you repaired wouldn't stop a scan tool from communication with the TCM because on this transmission the TCM isn't housed in the transmission like the later 722.9 versions or 2) your scan tool isn't capable of communication with the TCM.
I'm not familiar with the icarsoft scan tool but in earlier years I used a Snap-on MT2500 and it would not always reliably communicate with all modules of the different cars I worked on. I do remember it being able to communicate with TCM's in W210 but not in a W202 even though they used the same 722.6 transmission. I also had troubles communication with airbag modules, sometimes it would work and sometimes it wouldn't work.
I would say its a good sign that the range recognition works when you plug in the TCM and it doesn't work with the TCM disconnected since transmission range information on this car is CAN related.
Have you ever used the your scan tool to access other MB TCM's? Do you know an independent shop in the area that has the real MB SDS scan tool? You're not going to fix this problem until you can establish communication with the TCM.
|