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P2096, P2097 A/F SENSOR 1 EC-505 < DTC/CIRCUIT DIAGNOSIS > [MR FOR NISMO RS MODELS] C D E F G H I J K L M A EC N P O 3. CHECK FOR EXHAUST GAS LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before the three way catalyst 2. YES >> Repair or replace malfunctioning parts. NO >> GO TO 4. 4. CHECK FOR INTAKE AIR LEAK 1. Reconnect A/F sensor 1 harness connector. 2. Start engine and run it at idle. 3. Listen for an intake air leak after the mass air flow sensor. YES >> Repair or replace malfunctioning parts. NO >> GO TO 5. 5. 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. YES >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to . NO >> GO TO 6. 6. CHECK A/F SENSOR 1 POWER SUPPLY 1. Turn ignition switch OFF. 2. Disconnect A/F sensor 1 harness connector. 3. Turn ignition switch ON. 4. Check the voltage between A/F sensor 1 harness connector and ground. Is the inspection result normal? YES >> GO TO 8. NO >> GO TO 7. 7. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect IPDM E/R harness connector. 3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector. 4. Also check harness for short to ground. YES >> Perform the trouble diagnosis for power supply circuit. NO >> Repair or replace error-detected parts. 8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. + - Voltage A/F sensor 1 Connector Terminal F70 4 Ground Battery voltage + − Continuity A/F sensor 1 IPDM E/R Connector Terminal Connector Terminal F70 4 E14 36 Existed |