I was looking thru the service manual for the ECV730 Kohler. Two EFI systems were used and of course two different troubleshooting charts.
Never have been a fan of EFI on a mower engine, but I go back to the late 50s in small engine and other stuff relative to engine maintenance.
In 1970 I spent a week at carb school in Boston, MA. Covered the Quadrajet, the Carter and Rochester carb lines. Who would have thought carb school could take a week! Holley and Ford carb school was later the same year but only 2 1/2 days again in Boston, MA where there is always ample parking and reasonably priced hotels!!!
In a very basic EFI realm, crankshaft position sensor, throttle position sensor, O2 sensor, fuel injector(s), electronic control module, high pressure fuel supply and the related wiring are additional items are needed above an engine with a carb.
Oh well!!!!