I preach this often for a reason. They are the nicest diagrams I know of. They are accurate, detailed and very specific. And the book also gives TCCS control functions, as the wiring connects the ECU to every thing in the car.
Buy one on Ebay. Buy one at the dealer. Buy it for your exact year, even though they are mostly the same.
Here is the link to the 90. Look through it so you can see all the info it has. It is better than the repair manual.
http://www.cygnusx1.net/supra/library/Wiring/index.html
Buy one on Ebay. Buy one at the dealer. Buy it for your exact year, even though they are mostly the same.
Here is the link to the 90. Look through it so you can see all the info it has. It is better than the repair manual.
http://www.cygnusx1.net/supra/library/Wiring/index.html