Mode II (Self-Diagnostics)

When Mode II is accessed (engine not running), codes stored in ECM memory will be flashed by CHECK ENGINE light (if equipped) and Red LED on side of ECM.

Long flashes (.6 second) indicate first digit of code. Short flashes (.3 second) indicates second digit of code. For example: one long flash followed by 2 short flashes indicate a Code 12. See Fig 1 .

Fig 1: Trouble Code Display (Sentra)

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