auto trani not shifting 1jz swap

[streetpower]

when driving vehicle is stuck in 1 st gear...?
details 1jz swap fat plug computer 1 j auto trani.
car starts fine and revs and drives no misfiring or break up etc.
disconnected the plug that is close to the shift selector on the trani
and i can manually shift the trani it will go through the gears.
do i need to supply power to this plug or ground and if so what wires?
thanks
car is a 1990 supra turbo auto

 

[plaaya69]

That switch is the neutral safety switch and it will allow you to start your car only in Park and Neutral. Do you have transmission codes?

 

[streetpower]

That switch is the neutral safety switch and it will allow you to start your car only in Park and Neutral. Do you have transmission codes?

no codes the car starts in any gear.....?

does the switch send a negative signal to ecu ?

 

[black89targa]

If the car starts in any gear it's the Neutral safety switch

previous owner said it did this before the transmission blew to pieces.

 

[IJ.]

I rarely do this but this is my "understanding" so keep in mind I may not be correct.

The NSS is on the trans itself

The switch the OP unplugged is the Sector switch and on a a343e it sends a gear indicator signal to the dash (not sure if the ECT takes this info as well)

I believe the ECT is part of the ECU on Jz cars.

 

[streetpower]

does the neutral safty switch need to send a ground signal to ecu for trani to work?

 

[IJ.]

As far as I know the NSS only affects the starter.

The selector switch is another matter though, I'm not sure how much info the ECU/ECT use from it.

Have you checked for Trans codes yet?