Starter motor cranking
As soon as the engine starts to rotate and the control module
receives signals from the crankshaft position sensor, the fuel pump
relay operates so that all valves open simultaneously and remain open
for a length of time which is dependent on temperature. This takes
place only once, i.e. during the first injection, and it is done to
achieve shorter starting times. After this initial injection of fuel
the system changes to sequential injection.