The transmission computer uses sensors located on both the engine and transmission for shift timing.
On a computer controlled transmission, the throttle position sensor is one input used for shift timing.
It reads the speed of the output shaft. On a transmission it is used for shift timing.
It measures the speed of the transmission input shaft. The transmission computer uses this info for shift timing.
NO, there is no coalition between the ignition switch and the transmission. The ignition switch does 2 things. Turns on power to the electrical system for the engine and supplies power to the starter during start-up.
higher phase shift lower impedance
The onboard computer senses the position of the crankshaft by monitoring the output from the crankshaft position sensor. With that information, and the input from other sensors, the computer can determine appropriate injector duration, ignition timing, EGR valve operation and transmission shift points.
It measures the speed of the output gear of the transmission. It is used for shift timing.
It retards / slows the timing up and makes the transmission shift hard. The engine has to be running right for the transmission to work right. It would really help to know the year. There could be other problems depending on the year.
Try replacing the vehicle speed sensor (VSS). It's held in place on the side of the transmission by a single bolt and it has a single electrical connection. I had the same problem, and this cleared it up instantly!
Check the fuses and/or brake light switch.
It will effect the accuracy of the speedometer and odometer, effect the transmission shift points, effect the fuel mileage, effect the brake horse power,