System Diagram

Courtesy of NISSAN NORTH AMERICA, INC.

When ignition switch is turned ON, ECM performs the following functions:

To ensure full flow, the fuel pump is actuated via the FPCM (only at first time ignition ON after unlocking the vehicle).
MIL (Malfunction Indicator Lamp) is actuated for the lamp check by the ECM via CAN communication.
Malfunction memory in the ECM can be read out and deleted via the diagnosis tool.
The throttle valve actuator checks its return spring (by the position of the throttle valve) and adapts the position of the actuator, if necessary.