techturner22
Newbie
Hey all,
First time poster here. I've seen many threads about this issue but haven't been able to formulate a straight answer for my problem.
The specifics: Trans will not shift out of 1st into 2nd below 2500rpm/~20mph. Issue occurs cold or hot. All other gears and shift points are correct. I have replaced the TPS. I checked for smooth and linear voltage response on the new TPS with a multimeter but have not checked with an oscilloscope. New TPS checked good with a multimeter.
My question is, how likely is it that it is something internal? i.e. shift solenoid, accumulator piston, servo, check ball. Which would be most likely? Or is it possible it is something else external such as the MAP sensor? I am hesitant to pull the pan to replace the solenoids and accumulator piston because I do not know the history of the truck, however the fluid seems to be in okay shape for the mileage (189k miles).
First time poster here. I've seen many threads about this issue but haven't been able to formulate a straight answer for my problem.
The specifics: Trans will not shift out of 1st into 2nd below 2500rpm/~20mph. Issue occurs cold or hot. All other gears and shift points are correct. I have replaced the TPS. I checked for smooth and linear voltage response on the new TPS with a multimeter but have not checked with an oscilloscope. New TPS checked good with a multimeter.
My question is, how likely is it that it is something internal? i.e. shift solenoid, accumulator piston, servo, check ball. Which would be most likely? Or is it possible it is something else external such as the MAP sensor? I am hesitant to pull the pan to replace the solenoids and accumulator piston because I do not know the history of the truck, however the fluid seems to be in okay shape for the mileage (189k miles).
