October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Mode I (Malfunction Warning)

This is the normal vehicle operating mode. Green LED will indicate loop status. If LED is not blinking, vehicle is in open loop or there is a fault with the oxygen sensor or sensor circuit. If LED is blinking, vehicle is in closed loop. If a malfunction occurs in Mode I, Red LED and check engine light (if equipped) will illuminate, indicating an ECCS malfunction has occurred.