Hello and welcome to the forum.
Honda first put fuel injection on the 1985 GL1200 with what was then called Computerized Fuel Injection or CFI this bike was the Limited and in 1986 the second GL1200 the Aspencade SEi and that was the end of fuel injected Goldwings. 2001 fuel injection returned for the 1800 and the EFI and is still in use on the 2012. Actually the system on the GL1500 is more complex than the 1800, but if you look at the names of some of the sensors on the 1500 they sound strangely like those used on the 1800 and have the same job.
Visit www.goldwingworld.com http://www.goldwingworld.com/pages/Goldwing history.pdf