![]() ![]() ![]() After that, the codes can be erased, but that doesn't make the problem go away. You don't want to lose that valuable information until after those codes have been read and recorded. Those codes provide information on where to start the diagnosis. Disconnecting the battery will also erase any stored diagnostic fault codes. Once you start driving again, the relearning will take it right back to where it was, usually within two to three miles or a half dozen shift cycles. If you want to "reset" a computer thinking that is going to solve some problem, all you have to do is disconnect the negative battery cable for half a minute. Now we go from a solid shift yesterday to defaulting to limp mode today, with no warning.Īll other manufacturers now have their own version of Chrysler's computer-controlled transmission. The downside is we no longer get the two or three years of sloppy or mushy shifts that told us a rebuild was in the near future. That ensures the clutches are applied sooner before the previous one was released, to maintain the nice crisp shifts it had when it was new. Those volumes, called the "clutch volume index", (CVI), updates as the fiber clutch plates wear. In the case of the original computer-controlled transmission developed by Chrysler for 1989 models, it immediately learns the volume of fluid it takes to apply each clutch pack. From then on, the computer updates with every shift cycle it goes through. That puts them back to the initial state they left the assembly line in. The only thing that can be done with computer memories is to erase anything they've learned. To see the definitions, or I can interpret them for you. If there are "P" codes shown, you can go here: Most independent repair shops can do that for you. If they can't read codes in the Transmission Computer, you'll need to find a mechanic with a scanner that can access that computer. The people there will read fault codes for you for free, but usually they can only read codes in the Engine Computer. You might be able to have that done at an auto parts store. If you're observing some other problem related to shifting, start by having the diagnostic fault codes read in the Transmission Computer. When it engages, typically starting around 30 - 40 mph, engine speed will drop about 200 rpm. The only thing you might notice is slightly higher or lower shift points, and at what road speed the torque converter's lock-up clutch engages. The computer selects different modes, based mostly on transmission temperature and an attempt to get it warmed up faster, and it switches between those modes automatically. ![]()
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