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DTC P1278, P1288 A/F SENSOR 1 EC-547 C D E F G H I J K L M A EC Revision: 2005 August 2005 Murano 12. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between the following terminals. 4. Check harness continuity between the following terminals and ground. 5. Also check harness for short to power. OK or NG OK >> GO TO 13. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 13. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER Refer to EC-408, "Component Inspection" OK or NG OK >> GO TO 14. NG >> Replace A/F sensor 1. 14. CHECK MASS AIR FLOW SENSOR Refer to EC-192, "Component Description" OK or NG OK >> GO TO 15. NG >> Replace mass air flow sensor. A/F sensor 1 terminal ECM terminal Bank 1 1 16 2 75 5 35 6 56 Bank 2 1 76 2 77 5 57 6 58 Continuity should exist. Bank 1 Bank 2 A/F sensor 1 terminal ECM terminal A/F sensor 1 terminal ECM terminal 1 16 1 76 2 75 2 77 5 35 5 57 6 56 6 58 Continuity should not exist. |