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TROUBLE DIAGNOSIS - SPECIFICATION VALUE EC-135 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] C D E F G H I J K L M A EC N P O >> GO TO 22. 22. CHECK “A/F ALPHA-B1” 1. Start engine. 2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the SP value. 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 make sure that the indication is within the SP value. YES >> GO TO 24. NO >> More than the SP value: Replace mass air flow sensor (Refer to ), and then GO TO 29. 24. REPLACE ECM 1. Replace ECM. Refer to EC-338, "Removal and Installation" 2. Perform . >> GO TO 29. 25. 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 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 make sure that the indication is 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 make sure that the indication is 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 leak after the mass air flow sensor. Refer to the following. • Disconnection, looseness, and cracks in air duct • Looseness of oil filler cap • Disconnection of oil level gauge • Open stuck, breakage, hose disconnection, or cracks of PCV valve • Disconnection or cracks of EVAP purge hose, open stuck of EVAP canister purge volume control solenoid valve |