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EC-146 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] TROUBLE DIAGNOSIS - SPECIFICATION VALUE 2. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and >> GO TO 22. 22. 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 Is the measurement value within the SP value? YES >> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to . Then GO TO 29. NO >> GO TO 23. 23. CHECK “MAS A/F SE-B1” Select “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP Is the measurement value within the SP value? YES >> GO TO 24. NO >> More than the SP value: Replace mass air flow sensor, refer to GO TO 29. 24. REPLACE ECM 1. Replace ECM. 2. EC-16, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require- >> GO TO 29. 25. CHECK INTAKE SYSTEM Check for the cause of uneven air flow through mass air flow sensor. Refer to the following. Is the inspection result normal? YES >> GO TO 27. NO >> Repair or replace malfunctioning part, and then GO TO 26. 26. CHECK “B/FUEL SCHDL” Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP Is the measurement value within the SP value? YES >> INSPECTION END NO >> Less than the SP value: GO TO 27. 27. CHECK “MAS A/F SE-B1” Select “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP Is the measurement value within the SP value? YES >> GO TO 28. NO >> Less than the SP value: Replace mass air flow sensor, refer to ,and then GO TO 30. 28. CHECK INTAKE SYSTEM Check for the cause of air leakage after the mass air flow sensor. Refer to the following. |