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P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE EC-663 < COMPONENT DIAGNOSIS > [VQ40DE] C D E F G H I J K L M A EC N P O OK >> GO TO 18. NG >> GO TO 17. 17. REPLACE A/F SENSOR 1 Replace malfunctioning A/F sensor 1. CAUTION: • Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. • Before installing new A/F sensor, clean exhaust system threads using Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant. >> INSPECTION END 18. CHECK MASS AIR FLOW SENSOR With CONSULT-III Check mass air flow sensor signal in “DATA MONITOR” mode with CONSULT-III. With GST Check mass air flow sensor signal in Service $01 with GST. OK or NG OK >> GO TO 19. NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or ground. Refer to EC-569, "Component Inspection" . 19. CHECK SYMPTOM MATRIX CHART Check items on the rough idle symptom in EC-943, "Symptom Matrix Chart" . OK or NG OK >> GO TO 20. NG >> Repair or replace. 20. ERASE THE 1ST TRIP DTC Some tests may cause a 1st trip DTC to be set. >> GO TO 21. 21. CHECK INTERMITTENT INCIDENT . >> INSPECTION END 2.0 - 6.0 g·m/sec: at idling 7.0 - 20.0 g·m/sec: at 2,500 rpm 2.0 - 6.0 g·m/sec: at idling 7.0 - 20.0 g·m/sec: at 2,500 rpm |