I have to admit right off the bat that I know little about Transmissions.
This is a 2002 Dakota with 3.9 engine and 3 speed Automatic with OD. 282K miles.
Great runner and well maintained.
No DTC codes present, and checking Transmission codes showed no codes.
Tranny fluid and filter was changed 20K ago.
Tranny fluid is clean and does not smell burnt.
One shift solenoid was replaced about 100k ago. But I dont remember wich one.
This morning I got off the main highway and when I came to a stop and started away from the stop sign The truck stayed in 1st gear and would not up shift.
I was only a few miles from my shop so I nursed it to the shop.
It stayed in 1st gear until I started down a small hill and as I gained speed it shifted into 3rd gear. The reason I feel it was third was that I topped out at about 50 and the tach read 2300 RPM. If I was in overdrive it would have dropped to about 1700 RPM at that speed.
I tested the TPS to be sure it was sending the signal to the PCM.
Checking voltage across pins 1 & 3, I got 5.2 volts. This is within the range the book calls for.
Next with the connecter plugged back in I probed pin 2 and and got a range of .36 V with the throttle in the idle position and the reading climbed to .38v as I went to full throttle position. The book says .35v at idle and 4.5 V at full throttle.
I think I can eliminate the TPS as the problem.
I then put the truck up on the lift and found a broken wire at a 6 pin connector on the tranny. I think it was a black wire. The wiring schematic I have shows no black wire though.
There was just enough wire out of the connector for me to solder in a short lead and solder to the remaining wire.
I still have no upshifting.
Addition; I had work to do today and had to use the truck for work.
I drove about 25 miles and had to get to about 30mph…3500rpm and let off on the gas a bit and it would finally shift to third…skipping 2nd gear. I checked the tranny fluid 3 times on the trip and again when I got home. The fluid was clean and pink with no foul odor.
Any help would be appreciated.
Where are all those tranny experts!!!