Functions Within The System
WARNING: This page is about a different car, the 2020 Infiniti QX50. However, it is still accessible from the selected car via links, so may be relevant.
The ECM judges the engine speed based on the crankshaft position signal that is input into it.
It also includes a reverse rotation detection function, and if it detects reverse engine rotation while idling stop is activated, it performs early start control when the engine restarts.