Sean1933 Posted January 5, 2007 Share Posted January 5, 2007 I know its not Supra related but i though there was more chance of a reply if i posted in here, and i need a reply cause im going mad! Plus i know i dont look in the technical non-supra section very often My friend has just bought an Apexi Power FC for his EVO 3. We plugged it in last night and took it for a drive on the base map to see how it was, obviously monitoring AFR, etc. The problem that seemed to arise was that the Tacho decided to not work until running at over 4000rpm, when it registered. As soon as you let off and/or fell below 4000rpm the Tacho stopped registering. I have checked on the FC Commander and it is showing the revs on there correctly, and obviously it would not know where to look on the maps if it did not know the rpm so it would not run right. There are no faults showing on the ECU (engine warning light). What weired is that as soon as you plug the standard ECU in it runs fine. This makes me think that its the ECU Wiring harness that is wrong, but my friend says its def the right one. If it was the harness then the ECU would not know the rpm, and why would the Tach only register over 4000rpm??? Any ideas cause its driving us nuts and we cant progress until this is sorted as we can datalog with the LM1 either as that is tapped into the Tach wire (i have tried it without this connect but makes no difference) so it reads the same as the Tach...wrong! HELP!!! Link to comment Share on other sites More sharing options...
Sean1933 Posted January 5, 2007 Author Share Posted January 5, 2007 All sorted now. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted January 5, 2007 Share Posted January 5, 2007 OK so after all that what was the problem? Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 6, 2007 Share Posted January 6, 2007 Only just seen this as of last night. You need to cut a loom wire to get the tacho working. Link to comment Share on other sites More sharing options...
Sean1933 Posted January 6, 2007 Author Share Posted January 6, 2007 Yep thats what we did. The Evo Forum seems pretty useless. So i figured that the tacho wire must be causing the fault so i cut it as a test...and yep it worked! Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 6, 2007 Share Posted January 6, 2007 Sorry I didn't see this earlier, anyway, you did the right thing Link to comment Share on other sites More sharing options...
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