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12 DETECT MALFUNCTIONING PART Check the following. I Fuel pump and circuit (Refer to EC-605.) I Fuel pressure regulator (Refer to EC-51.) I Fuel lines. Refer to MA-16, “Checking Fuel Lines”. I Fuel filter for clogging © Repair or replace. 13 CHECK IGNITION TIMING Perform “Basic Inspection”, EC-107. OK or NG OK © GO TO 14. NG © Adjust ignition timing. 14 CHECK HEATED OXYGEN SENSOR 1 (FRONT) Refer to “Component Inspection”, EC-202. OK or NG OK © GO TO 15. NG © Replace heated oxygen sensor 1 (front). 15 CHECK MASS AIR FLOW SENSOR With CONSULT-II Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II. at idling: 2.5 - 5.0 g·m/sec With GST Check mass air flow sensor signal in MODE 1 with GST. at idling: 2.5 - 5.0 g·m/sec OK or NG OK © GO TO 17. NG © GO TO 16. 16 CHECK CONNECTORS Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or engine grounds. OK or NG NG © Repair or replace it. 17 CHECK SYMPTOM MATRIX CHART Check items on the rough idle symptom in “Symptom Matrix Chart”, EC-125. OK or NG OK © GO TO 18. NG © Repair or replace. GI MA EM LC FE CL MT AT AX SU BR ST RS BT HA SC EL IDX DTC P0300 - P0304 NO. 4 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MISFIRE Diagnostic Procedure (Cont’d) EC-327 |