I forgot about the neutral lockout switch because mine is disabled. For a manual car you need to step on the clutch pedal while cranking. Automatics have one too. It needs to be in park and it could be out of adjustment. You can check for stored codes using the procedure outlined in a repair manual if you have one or use the online manual. Here is a link.
http://www.cygnusx1.net/Supra/Librar...Section=ST&P=2 And here.
http://www.cygnusx1.net/Supra/Librar...ection=FI&P=23