Ya their are a couple of things the tcm uses to calculate shift. One is the tp (throttle position) senser you should see .5 volts closed throttle and close to 5 v wide open throttle. If this is mest up your tcm thinks you are just half assing the pedal.

The next is the ect (engine coolant temp senser) with a hot engine you will see close to 5 volts and with a cold engine close to 0 volts. A cold engine will not shift on red line.(your engine may be hot the tcm will not know this)

Their is also some upshift/downshift comparative signals used to communicate between the ecm and tcm. Also a shift acknowledgment communication line between the 2 any of this will mes with your shift.

I wish you had a d4 light we probably have a tcm dtc.

I will try again if you are ready. Private message me and be prepared to make your volt meter your best friend.

 

try reseting ur ecu. i forgot how its done, but disconnect ur battery and leave it for an hour. and then connect it back again. see if that works

 

half the info ur tcu recieves is from the ecu.

 

I try all those before and it doesn't work. Hey fuse, pm sent.