Combination of engine and transmission sensor are fed to the computer and it then actuates solenoids in the trans to make the shift.
Many things are inputed to tell the tranny to shift. The Solonoid pack executes the shift, and the transmission control module tells it when to shift. A good resouce is www.allpar.com.
the two sensors on a transmission communicate with the computer to the engine and tells the transmission when to shift up or down....
If the 1999 Chevrolet Metro will not shift automatically there may be a problem with the transmission solenoid. The solenoid tells when the transmission when to shift, and when it is malfunctioning will cause a vehicle to stay stuck in a certain gear.
The THM200C does not use a vacum line. It has a cable that tells it when to shift.
In most modern cars, transmission shift is controlled by the computer. If the transmission won't shift, you most probably have a bad shift solenoid or solenoid circuit problem. You could also have a bad gear selector switch. Following that, check the computer and its related sensors. See the manufacturer's documentation for specifics.
it tells the radiator fan when to turn on
Replace your speedometer sensor. I just had mine replaced in my '04 Impala. The sensor tells the tranny when to shift. It's located right in front of the transmission.
the Toyota dealer said that my e.c.u. ( that tells the transmission when to shift) had gone out. Thank God it was warranted.
I had a problem shifting my suburban out of park. It ended up being the brake switch, it tells the transmission that you are pushing down the brake.
TCM is short for transmission control unit. It is under the dash, driver's side. It tells an automatic transmission when to shift. Fuses for the TCM are in the engine bay.
the speed sensor senses the speed and tells your transmission when to shift , it also controls your speedometer.
Try replacing the transmission sensor/cable it is $35.The signal that tells the computer to turn OD back on is probably not making it to the transmission.