Single LED System
WARNING: This page is about a different car, the 1993 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
When Mode II is accessed (engine not running), codes stored in ECM memory will be flashed by CHECK ENGINE light and Red LED on side of ECM. Long flashes (.6 second) indicate first digit of code. Short flashes (.3 second) indicate second digit of code. For example: 3 long flashes followed by 5 flashes of Red LED (or CHECK ENGINE light) indicate a Code 35.