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: Relationship Diagram Between MIL, Driving Pattern And Permanent DTC Status

Courtesy of NISSAN MOTOR CO., U.S.A.