When a DTC is stored in ECM

When a DTC is stored in ECM and MIL is ON, a permanent DTC is erased with MIL shutoff if the same malfunction is not detected after performing the driving pattern for MIL shutoff three times in a raw.

Fig 1: Permanent DTC, MIL And Vehicle Speed Driving Pattern (DTC Stored In ECM)

Courtesy of NISSAN NORTH AMERICA, INC.