I just installed a new turbo on my 90' supra. After the install its idling kinda high 1100rpm. I wanted to set base timing and clear any codes. The engine light is on. But when I put my jumper wire in I get nothing, no codes and engine light is still on. I dont know if its in diagnostic mode so I dont want to mess with timing. I pulled the efi for 30+ seconds to try to clear but nothing changed... Also I checked hoses and connections cant find anything I left off. When i got the car the turbo was bad and had been set up to run without it and it ran and idled normal. Any advice?thanks.