it uses wire 56 as a power supply. 56 starts from the six wire connector cavity 11. It is hot when cranking. There is a splice on this wire as it also powers the starter contactor. A problem at that splice could cause no power to the choke, but if the starter is engaging and cranking, the wire 56 output from the board is good. You can carefully probe the choke connector wire 56 (do not insert any object into the terminal, just touch it) and see if it has 12 volts during cranking with the gas off to prevent actual starting and keep the reading available longer.
The choke's patterned movements are controlled on the ground side by the board with wire 90, same six wire connector cavity 15. 56 won't be hot while the engine is running, so apparently no juice to the choke = choke open. Energized = closed. So to close the choke during cranking wire 90 is grounded by the board via terminal 15 in the six wire connector. The six wire connector (wires 14, 23, 15b, 0, 56, 90), plugs into an 18 cavity socket on the controller. That socket should have a male pin in both cavity 11 and 15.
State your problem, not your diagnosis.