Hyster Canbus Adapter Part # 1532578 - Tier IV & Hyster Pc Service Software
Canbus to Truck Harness Part # 1534009 - Tier IV & Hyster Pc Service Software

Impco:
Canbus Adapter Part # E2046002 - Tier III
Canbus Cord Adapter Part # E1557400 - Adapt Tier III to Tier II

The impco software is free from the website. PC Service Tool is generally not available to the public.

I think that $1000.00 USD will get you a few of the cords, but getting the PN for the cords is the trick...

I utilize the tools from impco, which are factory tools for engine faults.
www dot impco.ws/spectrum-test-tools.asp
do you have the dash password for your hyster? normally its 55555
expect to spend over a $1000 just for the cords, unless your a repair shop or have a large fleet its tough to justify the expense.

Well said Ed T- you are correct. There have only been a couple of issues where I had to have the dealer "read" the on board computer.

As an older tech I've had to really wrap my head around the new way the electronics handle the operation of newer lifts. If you take your time & use good old fashioned diagnostics skills (& get advise from this site) there's really not much you can't handle w/out the scan tools

there are numerous different tools to connect to different vendors emission control system, and in the forklift world, there are no real "aftermarket" scanners.
the manufacturers' dealer representatives have a mandate from the C.A.R.B to insure that only properly trained personal are allowed to access software that can adjust the emission system, and using [what I consider to be] an over abundance of caution they have interpreted that to mean 'if that dealer has not taught you, [and registered your information with the factory] then they do not have to sell you any method to connect to the truck.
All that said, in about 95% of all forklifts sold in the USA since 2004, about 98% of all diagnosis and repair can be done without any 'scan tool' or computer at all.