TO:D4S:cold start:

D-4S（Direct injection 4 stroke gasoline engine Superior version）

https://car.motor-fan.jp/tech/10019010

During a cold start, the system times the opening of the port and direct fuel injector to decrease emissions and achieve stratified combustion. Immediately after a cold engine start and during the exhaust stroke, fuel is injected into the intake port from the fuel injector assembly (for port injection).

https://www.tomorrowstechnician.com/toyota-d-4s-port-fuel-or-direct-fuel-injection-why-not-both/