idosubaru Posted December 24, 2007 Author Share Posted December 24, 2007 after this little escapade that's what i've come to realize, you could leave the harness unplugged and hook up whatever comibination of switches equals 1st or whatever combination of switches equals 2nd..etc. if i am going to drive it for awhile it would be a good idea to power duty solenoid C if i can figure out what kind of voltage it's supposed to be at. anyone think the FWD switch is entirely negated with the trans harness unplugged, that would be the easy way to "disable" the 4WD. i don't have my FSM with me. Quote Link to comment Share on other sites More sharing options...
OB99W Posted December 24, 2007 Share Posted December 24, 2007 [...]anyone think the FWD switch is entirely negated with the trans harness unplugged, that would be the easy way to "disable" the 4WD. i don't have my FSM with me.All the diagrams I've seen show the FWD "switch" connected to an input on the TCU; that, of course, would mean that without the TCU, the switch/fuse doesn't do anything. Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted December 25, 2007 Share Posted December 25, 2007 According to endwrench, unplugging the trans harnesses puts the trans in failsafe mode. The AWD is engaged as it indicates turning a front wheel by hand with it in neutral will make the rear wheel turn as well. The problem I can see with switches is the TCU controls most of the solenoids with varying duty cycles from 5% to 95% at 50Hz; a switch can't really mimic that (unless you're fast!); maybe that's already been addressed in this thread. Quote Link to comment Share on other sites More sharing options...
98obster Posted December 25, 2007 Share Posted December 25, 2007 According to endwrench, unplugging the trans harnesses puts the trans in failsafe mode. The AWD is engaged as it indicates turning a front wheel by hand with it in neutral will make the rear wheel turn as well. The problem I can see with switches is the TCU controls most of the solenoids with varying duty cycles from 5% to 95% at 50Hz; a switch can't really mimic that (unless you're fast!); maybe that's already been addressed in this thread. darn, and I was thinking of putting in paddle shifters for my 4eat and a tranny cooler:headbang: Quote Link to comment Share on other sites More sharing options...
scrapdaddytatum Posted February 7, 2008 Share Posted February 7, 2008 first of john needs to chill bit aggresive there with the "DUHS" not every one here gets this chit but let me add my 2cents i know limp mode is 3rd, i am surprised nipper didnt add that i bet when you unhook the tcu u get third and reverse+AWD you get this when the tcu fails, wiring fails, or the trans has a bad issue with tcu disconected the FUSE is useless i think with that xt6 tranny you might want to try a different tcu for chits and giggles but i think nipper is right about the pump im going to test some of the theries brought up here today i have a trans job im working right now and it is haveing fun issues (stuck in first+awd) so im up for trying anythig Quote Link to comment Share on other sites More sharing options...
idosubaru Posted February 7, 2008 Author Share Posted February 7, 2008 it's currently running great, so i'm not trying anything else. i've put quite a few miles on it and traveled through a number of states. Quote Link to comment Share on other sites More sharing options...
scrapdaddytatum Posted February 7, 2008 Share Posted February 7, 2008 it's currently running great, so i'm not trying anything else. i've put quite a few miles on it and traveled through a number of states. fair enough i just swaped the tcu in my trouble car and got shifting and AWD back but now i got the flashing tcu LIGHt allways something Quote Link to comment Share on other sites More sharing options...
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