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P2A00, P2A03 A/F SENSOR 1 EC-1089 < DTC/CIRCUIT DIAGNOSIS > [VK50VE] C D E F G H I J K L M A EC N P O 3. Turn ignition switch ON. 4. Turn ignition switch OFF and wait at least 10 seconds. 5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load. 6. Let engine idle for 1 minute. 7. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes. 8. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Go to EC-1089, "Diagnosis Procedure" NO >> INSPECTION END Diagnosis Procedure INFOID:0000000005237591 1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection M95. Refer to Ground Inspection in Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 2. RETIGHTEN A/F SENSOR 1 Loosen and retighten the A/F sensor 1. Refer to EM-205, "Disassembly and Assembly" . >> GO TO 3. 3. CHECK A/F SENSOR 1 CONNECTOR 1. Disconnect A/F sensor 1 harness connector. 2. Check that water is not inside connectors. Is the inspection result normal? YES >> GO TO 4. NO >> Repair or replace harness connector. 4. CHECK FOR INTAKE AIR LEAKAGE 1. Reconnect A/F sensor 1 harness connector. 2. Start engine and run it at idle. 3. Listen for an intake air leakage after the mass air flow sensor. Is intake air leakage detected? YES >> Repair or replace malfunctioning part. NO >> GO TO 5. 5. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to EC-585, "MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Special Repair Requirement" . 2. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine? YES >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to or NO >> GO TO 6. 6. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF and then turn it ON. 2. Disconnect A/F sensor 1 harness connector. 3. Check the voltage between A/F sensor 1 harness connector and ground. |