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Diagnostic Test Mode II — Front Heated Oxygen Sensor Monitor NCEC0032S06 In this mode, the MI displays the condition of the fuel mixture (lean or rich) which is monitored by the heated MI Fuel mixture condition in the exhaust gas Air fuel ratio feedback control condition ON Lean Closed loop system OFF Rich *Remains ON or OFF Any condition Open loop system *: Maintains conditions just before switching to open loop. To check the heated oxygen sensor 1 (front) function, start engine in the Diagnostic Test Mode II and warm OBD System Operation Chart NCEC0033 RELATIONSHIP BETWEEN MI, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS NCEC0033S01 I When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are I When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are I The MI will go off after the vehicle is driven 3 times with no malfunction. The drive is counted only when I The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A) I The 1st trip DTC is not displayed when the self-diagnosis results in “OK” for the 2nd trip. SUMMARY CHART NCEC0033S02 Items Fuel Injection System Misfire Other MI (goes off) 3 (pattern B) 3 (pattern B) 3 (pattern B) DTC, Freeze Frame Data (no display) 80 (pattern C) 80 (pattern C) 40 (pattern A) 1st Trip DTC (clear) 1 (pattern C), *1 1 (pattern C), *1 1 (pattern B) 1st Trip Freeze Frame Data (clear) *1, *2 *1, *2 1 (pattern B) For details about patterns “B” and “C” under “Fuel Injection System” and “Misfire”, see EC-SR-65. ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION SR20DE Malfunction Indicator (MI) (Cont’d) EC-63 |