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EC-102 < COMPONENT DIAGNOSIS > [VQ40DE] P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER 2. Loosen and retighten three ground screws on the body. Refer to OK or NG OK >> GO TO 2. NG >> Repair or Replace ground connections. 2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT 1. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 2. Turn ignition switch ON. 3. Check voltage between air fuel ratio sensor 1 terminal 4 and OK or NG OK >> GO TO 4. NG >> GO TO 3. 3. DETECT MALFUNCTIONING PART Check the following. >> Repair or replace harness or connectors. 4. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 2 (bank 2) or 24, 43 (bank 1) and air fuel ratio (A/F) sen- 4. Also check harness for short to ground or short to power. BBIA0539E Voltage: Battery voltage BBIA0544E PBIB3308E Continuity should exist. 2009 Pathfinder |