There is no choke, this was on older cars with carburettors, the cold start enrichment is electronically controlled in the same way a modern car is, the ISCV opens and allows air to bypass the throttle plate and into the engine thus increasing the engine speed when cold, however it can also be utilised when a higher idle speed is required when the engine is under load, I.E when a high demand is placed on the electrical system.

Martin