My boss assured me he found a site (no longer there) which told him which 2 wires to bridge in order to read a code flashed by the check engine light. Since the lift is over 10 years old and well past dealer service time I'd hoped an insider would still know how to do that while not giving away copyrighted info. I will try to update my profile so you could contact me if you feel you can point me in a direction.

Gary, while I don't have any information I can easily share with you via e-mail, if someone did, which is frowned upon by most manufacturers and their reps (and these are fairly "non-trivial" instructions, to in-depth to relate here), they would need you to either have you add your e-mail to the profile (not in the forum posts, the software here correctly removes any properly formed url or e-mail address to lessen the "spam/spear phishing harvesting" that happens in online forums) or have you contact them by e-mail.

Hi again Edward, hope you are still out there, thanks for trying to help so far. I've got the final goods on this vehicle Model 7FGUC20; serial #86167: Engine designation 4TIEBO2.204Y ; TWC, O2S, TBI, NA Definitely a throttle cable. Now how do I get rid of the SAS light and read engine codes with a piece of wire?

Got the Model 7fguc20 and i'm 90% sure it's throttle by wire. I didn't notice anything that looked like an electronic T-body

no such luck (that forklifts would use some older form of self diagnostics common to most in the same year range) heck there are same model size and year ranges that don't use the same diagnostics. and any thing built before about 2002 will be "old-school" diagnostics anyway.
I see where you put "2.2L propane diagnostics". but I did not know which of the 2 different designations was the correct one. ;-)
We (in the forklift repair business) more often use the motor designation (4y), but since these machines sometimes get "rigged" with non-oem parts and sort of redesigned it is often better to give as correct much information as possible, so to not have it confused with other possible configurations. We also use the model and serial numbers since these machines may be manufactured and sold in differing years, and which year of manufacture/design would be designated by the model and serial number.
all that said, in 2004, I am pretty sure there were 2 different options for emission/carburation controls on LPG powered 4y motors that Toyota used, one was called ECS (a drive by wire-electronic throttle body) and TWC (three way catalytic converter with a throttle cable connection to the carburator). these use differing systems and different places to jumper to read out "flashing light codes". let us know which one you have and then we can go from there.

I'm sorry, I'm new to this. I did put 2.2 liter propane 2004 Toyota forklift in the header but apparently that doesn't show up, I'm pretty sure it is series 7 but the rest of the model I won't know until I go back in to work later in the week. I hoped that forklifts would use some older form of self diagnostics common to most in the same year range. The connector block is similar to a pre "94 car

I am pretty sure we will need the correct model and serial number, as well as what motor and emmission control options you have. the truck you listed "7FBESF15" I am fairly sure is a battery electric.