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EC-170 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] TROUBLE DIAGNOSIS - SPECIFICATION VALUE 15. DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR 1. Stop the engine. 2. Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it. >> GO TO 16. 16. CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2” 1. Start engine. 2. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each indication is within the SP value. Is the measurement value within the SP value? YES >> INSPECTION END NO >> Detect malfunctioning part according to . 17. CHECK “B/FUEL SCHDL” Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP value. YES >> INSPECTION END NO-1 >> More than the SP value: GO TO 18. NO-2 >> Less than the SP value: GO TO 25. 18. DETECT MALFUNCTIONING PART 1. Check for the cause of large engine friction. Refer to the following. - Engine oil level is too high - Engine oil viscosity - Belt tension of power steering, alternator, A/C compressor, etc. is excessive - Noise from engine - Noise from transmission, etc. 2. Check for the cause of insufficient combustion. Refer to the following. - Valve clearance malfunction - Intake valve timing control function malfunction - Camshaft sprocket installation malfunction, etc. >> Repair or replace malfunctioning part, and then GO TO 30. 19. CHECK INTAKE SYSTEM Check for the cause of uneven air flow through mass air flow sensor. Refer to the following. • Crushed air ducts • Malfunctioning seal of air cleaner element • Uneven dirt of air cleaner element • Improper specification of intake air system YES >> GO TO 21. NO >> Repair or replace malfunctioning part, and then GO TO 20. 20. CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL” Select “A/F ALPHA-B1”, “A/F ALPHA-B2”, and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that each indication is within the SP value. YES >> INSPECTION END NO >> “B/FUEL SCHDL” is more, “A/F ALPHA-B1”, “A/F ALPHA-B2” are less than the SP value: GO TO 21. 21. DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR 1. Stop the engine. |