Starter Motor Cranking

When fuel is first injected after the starter motor has been engaged and begins to crank the engine, the ECM selects on the basis of certain parameters the cylinder (of the two pairs 1 and 4 or 2 and 3 where a spark is produced) in which fuel should be injected.

For the first combustion processes the system generates an ignition spark in two cylinders but controls the supply of fuel right from the outset to only one of them. Not until then will both spark and fuel injection be synchronized so that the correct ignition timing is obtained.