Re: Cant get auto transmission in 89 GQ auto to go into diagnostic mode.
My diagnosis test did the same as yours, one continuous light. One of the things it said in my book for that was a faulty TPS, turns out I didn't even have a TPS (someone had fitted a carby from a manual, which doesn't have a TPS) so it looks like the diagnosis was correct.
Other things that can cause the TC to lock/unlock are;
Losing oil pressure(like past the "o" ring as happened to you).
Faulty TPS.(try adjusting it slightly left or right)
Lockout solenoid faulty (maybe that is the buzzing sound. But it shouldn't be a rapid lock/unlock, more likely to just stay off or on).
Faulty temp switch (there are two bolted to the valvebody, one sends a signal to the tcu the other is solely for the temp warning light on the dash).
Dodgy wiring(but again, it would more likely stay on or off)
Faulty road speed sensor (fairly rare. Does the Speedo flicker at all)
FanTapstic!
Cant get auto transmission in 89 GQ auto to go into diagnostic mode.
Quote:
Originally Posted by
ckh
correction going for a long drive yesterday it was doing it at 100+ as well...
Sry mate but can you clarify that the actual motor races/flairs or just the tacho ???