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EC-260 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] P014C, P014D, P015A, P015B, A/F SENSOR 1 >> Repair or replace malfunctioning part. 8. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 5. Let engine idle for 1 minute. 6. Increase the engine speed up to about 3,600 rpm and keep it for 10 seconds. 7. Fully release accelerator pedal and then let engine idle for about 1 minute. 8. Check 1st trip DTC. YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000011277995 1. RETIGHTEN A/F SENSOR 1 Loosen and retighten the A/F sensor 1. Refer to >> GO TO 2. 2. CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (manifold). Is exhaust gas leak detected? YES >> Repair or replace. NO >> GO TO 3. 3. CHECK FOR INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. YES >> Repair or replace. NO >> GO TO 4. 4. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to . 2. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P172 detected? Is it difficult to start engine? YES >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to . NO >> GO TO 5. 5. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT 1. Disconnect A/F sensor 1 harness connector. 2. Turn ignition switch ON. 3. Check the voltage between A/F sensor 1 harness connector and ground. PBIB1216E |