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P0172, P0175 FUEL INJECTION SYSTEM FUNCTION EC-193 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE] C D E F G H I J K L M A EC N P O 2. Listen for an exhaust gas leak before three way catalyst (manifold). OK or NG OK >> GO TO 2. NG >> Repair or replace. 2. CHECK FOR INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. OK >> GO TO 3. NG >> Repair or replace. 3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect corresponding A/F sensor 1 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows. Refer to Wiring Diagram. 5. Check harness continuity between the following terminals and ground. Refer to Wiring Diagram. 6. Also check harness for short to power. PBIB1216E A/F sensor 1 terminal ECM terminal Bank 1 1 35 2 56 Bank 2 1 16 2 75 Continuity should exist. Bank 1 Bank 2 A/F sensor 1 terminal ECM terminal A/F sensor 1 terminal ECM terminal 1 35 1 16 2 56 2 75 Continuity should not exist. BBIA0544E August 2012 2012 Pathfinder |