Sub Electric Oil Pump

The sub electric oil pump contains a "Three-phase brushless synchronous motors".

Courtesy of NISSAN NORTH AMERICA, INC.
Sub electric oil pump is operated with the signal from the sub electric oil pump inverter during stop/start operation. During an engine stop according to the stop/start system, the mechanical oil pump stops as well. For this reason, the sub electric oil pump generates oil pressure for engaging the clutch of automatic transmission as a substitute for the mechanical oil pump.