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Introduction The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua- I Diagnostic Trouble Code (DTC) .................................................................................Mode 3 of SAE J1979 I Freeze Frame data .....................................................................................................Mode 2 of SAE J1979 I System Readiness Test (SRT) code ..........................................................................Mode 1 of SAE J1979 I 1st Trip Diagnostic Trouble Code (1st Trip DTC) .......................................................Mode 7 of SAE J1979 I 1st Trip Freeze Frame data I Test values and Test limits .........................................................................................Mode 6 of SAE J1979 The above information can be checked using procedures listed in the table below. DTC 1st trip DTC Freeze Frame data 1st trip Freeze Frame data SRT code Test value Diagnostic test X X*1 — — — — CONSULT-II X X X X X — GST X X*2 X — X X *1: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other. The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected Two Trip Detection Logic When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in Items MIL DTC 1st trip DTC 1st trip 2nd trip lighting up 1st trip displaying 2nd trip displaying 1st trip displaying 2nd trip displaying Blinking Lighting up Misfire (Possible three way catalyst X — — X — X — Misfire (Possible three way catalyst — X — X — X — Closed loop control — DTC: P1148 — X — X — X — Fail-safe items (Refer to EC-98.) — X X*1 — X*1 — Except above — — X X X X *1: Except “ECM”. GI MA EM LC FE AT PD FA RA BR ST RS BT HA EL IDX ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION EC-49 |