carfreak85 Posted February 28, 2022 Share Posted February 28, 2022 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? Quote Link to comment Share on other sites More sharing options...
wtdash Posted March 4, 2022 Share Posted March 4, 2022 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 Quote Link to comment Share on other sites More sharing options...
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