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TROUBLE DIAGNOSIS - SPECIFICATION VALUE EC-149 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] C D E F G H I J K L M A EC N P O 2. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and then reconnect it again. >> 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 make sure that the each indication is within the SP value. OK or NG OK >> 1. Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to 2. GO TO 29. NG >> 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. OK >> GO TO 24. NG (More than the SP value)>>Replace mass air flow sensor, and then GO TO 29. 24. REPLACE ECM 1. Replace ECM. 2. Perform initialization of NVIS(NATS) system and registration of all NVIS(NATS) ignition key IDs. Refer to SEC-7, "ECM RE-COMMUNICATING FUNCTION : Description" . 3. Perform 4. Perform EC-128, "Accelerator Pedal Released Position Learning" . 5. Perform EC-128, "Throttle Valve Closed Position Learning" 6. <Flexible Fuel Vehicle> Perform EC-128, "Ethanol Mixture Ratio Adaptation (Flexible Fuel Vehicle)" . 7. Perform EC-129, "Idle Air Volume Learning" . >> 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 OK >> GO TO 27. NG >> 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. OK >> INSPECTION END NG (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. OK >> GO TO 28. NG (Less than the SP value)>>Replace mass air flow sensor, and then GO TO 30. |