Thanks for posting. The pre89 and 89+ ECU connectors are quite different as far as both pinout and color code are concerned. '97-'88 would look like T-12 on that page but Y and G are reversed if Y = NE and G = IGf. R is correct for +B1.
EDIT: When in doubt refer to the manufacturer's diagram...
http://www.cygnusx1.net/supra/Librar...aspx?S=FI&P=50 Confirms that the diagram they listed is not correct.
So, did you have the last unit correctly wired at any point? Just curious.