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P014C, P014D A/F SENSOR 1 EC-245 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A EC N P O 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. Is 1st trip DTC detected? YES >> Proceed to . NO-1 >> To check malfunction symptom before repair: Refer to GI-44, "Intermittent Incident" NO-2 >> Confirmation after repair: INSPECTION END Diagnosis Procedure INFOID:0000000010775156 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. Is intake air leak detected? 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 or . 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 + – Voltage A/F sensor 1 Connector Terminal F27 4 Ground Battery voltage |