Fail-Safe Mode
WARNING: This page is about a different car, the 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
When Malfunction "A" or "B" is detected in 2 consecutive trips, the ECM enters fail-safe mode and MIL illuminates. When Malfunction "C" is detected, even on 1st trip, ECM enters fail-safe mode and MIL illuminates.