Archived 98.5 transmission problems auto DTT upgrades

[satmike]

A friend is on his way to Baja and just north of the border his transmission is having a lot of problems shifting. He can manually shift it but it won't shift unless he moves the shifter into each gear. It will not stay in overdrive. He says seems to stay in lock up in drive. He has a DTT noise filter which he has adjusted to 4. 65 volts and that didn't help. Any Ideas would be great. I'll get him on the phone and see if I can get any more info. He is a fellow TDR member user name S Aronson. Thanks for any help in advance.

Mike

 

[tp0d]

How many miles on the transmission, and/or gov assembly? Sounds like a clogged gov sensor to me, he might be able to find one locally, it isnt too bad of a change out. Probably do the solenoid at the same time.

The oil level is good? low oil can cause bubbles and make the problem worse. filling it closer to max rather than closer to min is better.

Got any codes? speed sensor comes to mind. or even a bad temp sensor.

good luck

-j

 

[JLandry]

Mike,



It could be something as simple as the transmission output speed sensor. This inexpensive sensor is located on the tail housing of the transmission and it's signal is needed by the Powertrain Control Module to control shifting. It takes all of 5 minutes to replace this sensor and it can be purchased at any auto parts store.



Give that a try first.



John L.

 

[SAronson]

Made it back home!

Thanks for posting, Mike!



I could'nt find a solenoid or pressure sensor (without waiting a couple days). I pulled the pan, disassembled solenoid, cleaned solenoid and sensor, adjusted bands, filter and fluid, and new speed sensor. The pan was full of soft material, and this clogged solenoid. The filter was nasty too, but fluid was'nt too bad. This cured the problems, so we headed to mexico. On the way out, just south of Ensenada, the transmission quit and would'nt engage at all. Of course this was a nasty detour, single lane, and a ton of cars behind me going to Ensenada on a saturday night to party. I cycled the ignition and the transmission went into gear... . for 20 yards! Did this again, and went another 20 yards. Repeated drill several times, and made to the nastiest silt bed of a turnout. Pulled a motorcycle out of the trailer for my buddy to ride to town, and he picked up a filter and fluid. I pulled the pan and cleaned solenoid and sensor, and found the throttle valve return spring undone. We got it going and the truck made it another 5 miles before transmission started to act up again. Pulled into a motel and spent two days going through electrical connections, settings, more fluid ... etc. Drove it home slowly and it worked well, except it did'nt want to drop into first at stops.

I talked with Bill Kondolay (DTT), and he had me put my transmission voltage regulator to it's lowest setting and adjust my throttle valve cable so that it was at full stop when the throttle was at full stop. Last night I checked the speed sensor, and it had continuity between the prongs, so I pulled it and replaced with original sensor. The magnetic tip was covered in soft dust/ shavings. Took her for a spin and all was well... . until I decide to "punch it!". Now the transmission would'nt go into O. D. , and it was hunting in and out of second/third, and CEL came on. Pulled the only code3... 1693/ companion code. I limped it home and put it to bed for the night.

Today I found . 002 to . 004 resistance in battery gound to body on both batteries. Scraped, cleaned, dialectric greased everything. Then I remembered the last thing I did before the trip was to run a positive lead from th etruck batt's to the camper battery. I had previously unhooked the positive lead from the truck batt's to the camper battery in order to rule that out of the equation, but when I checked for continuity between the truck batt's and this hot lead to the camper battery I found it had some! Oh yeah, the neg. from camper battery was still hooked up to the ground on the frame! Removed neg. wire from camper battery to frame, and the continuity is gone. One strange thing I found today was when I checked for voltage on the ground wires on pass. side batt. (smaller black with tan tracer wires- unplugged from batt. ) I found they had a + . 55 volts... . Bad wiring harness?

I'm taking it down to my office right now for a test... . fingers crossed.