I need to know what colors are the wires for the button that turns the over drive on and off in the steering colum. If the button goes bad does the trans go into a fail safe mode. I only have 3&4 gear and revers.

Bill

 

Fill in your signature, so we know what year, engine, tranny, ect. you have, then we can help.

 

You're barking up the wrong tree on the switch. The od off switch is a momentary contact switch that just sends a pulse to the PCM. The pcm toggles it back and forth, not the switch. If it were to fail in the closed position the od would be off on every other key on off. If it failed in the open position nothing would happen, you would still have od.

Your trans temp sender could be bad or unplugged and cause no lockup. But if you don't have 1st and 2nd, the problem goes much deeper than electrical.

 

Well today I drove the truck down the hill. It started off in low gear then into 2nd and then 3rd. Whe I stopped it lost 1ft gear and took off in 3rd. I can manual shift it down to 2nd gear. For me to get low back I have to turn the truck off and then it will take off in low gear. I saw an artical about this problem in TRD magazine. It say's I need to put a 100ohm resistor on pin 31. I think. I need to find the artical.

Bill

 

The limp mode can be caused by the pcm seeing too high governor pressure.
Cause A would be a faulty sensor or gov. pressure solenoid, Cause B some adjustment or shiftkit in the transmission.
In case A (if the tranny is stock) the "fix" with the resistor will just be a band-aid, because if a sensor is running out of calibration or a solenoid starts freaking out it's not gonna get better by itself.
If you have a shiftkit or aftermarket VB I like hte idea of DTT's voltage regulator. It's a bit more work to install than the resistor, but you can adjust the governor pressure sensor excitation voltage right for the mods you did to your tranny without soldering.
I'm quite shure you can get equivalent products somewhere else, but I know and use the DTT stuff.

Just my 2c

AlpineRAM

 

Thanks great informatiom

bill