February 28, 20224 yr I thought I read an End Wrench article or a TSB at one point that discussed the AWD-engagement and Slope Control implementation on Phase 2 4EAT transmissions. As I recall, you could take the TCU from a 2003 AT and install it on the earlier Phase 2 4EATs to take advantage of the calibration improvements. I tried finding that link, but it has been a long time and End Wrench articles aren't as easily found as they once were. I sourced a 2003 TCU and installed it in our '99 Forester, but threw a CEL for "AT Communication Error," or something like that. Old TCU was reinstalled and the code cleared. Am I remembering a fever dream, or was this actually a thing at one point?
March 4, 20224 yr Hi, No direct help..... Have you seen this site's Endwrench: This site is probably listed in the Endwrench 'sticky' at the top of this forum. The file titles aren't the most helpful, but maybe it's in one of them. TD
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