the rate of the on/off cycle determines how much pressure and therefore how much rear wheel drive.
if you get the flashing AT Temp light the TCU thinks the duty c is bad. could be the duty c, but probably not in your case, or the wiring or the TCU. since yours is intermittent and your duty c is new i would suspect wiring / connectors or the computer.
if the duty c fails, or the voltage does not get to it, you cannot make it go into FWD. the duty c has to be good and getting voltage all the time to do that.
the power wire to the duty c (1995) is pin 3 on connector b55. but i don't know off hand if b55 is the 16 pin connector or the 20 pin connector. EDIT: it is pin 3 on the 20 pin connector.
if you have a TCU swap that in. if not, measure the voltage on pin 3 when the TB is occurring. does it have voltage? this might tell you if the solenoid is bad or the tcu.
if you cut the wire on pin 3 , on the 20 pin connector you will have 4wd ''locked'' and TB. generally this will cause your AT Temp light to flash the next time you start your car. if you put a 15 ohm, (iirc) resistor on it the light will not flash for a bad duty c. (i think, i haven't tried it yet.)
i had /have an intermittent duty c failure on my 95 legacy. i put the fuse in and sometimes it works and sometimes it doesn't. iirc, it tends to fail when hot. there is a good thread that addresses the TB issue due to a bad, scorched, burnt, ''something'' on the TCU circuit board.
i pulled the rear section of the drive shaft and just drive it in FWD. but i kept the fuse in just to see. some times FWD lights up and sometimes the AT Temp light flashes, but either way i never have TB. i also never have awd.
Edited by johnceggleston, 30 August 2011 - 01:55 PM.