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EC-188 < COMPONENT DIAGNOSIS > [VQ40DE] P0171, P0174 FUEL INJECTION SYSTEM FUNCTION 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 1. Listen for an intake air leak after the mass air flow sensor. 2. Check PCV hose connection. 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. PBIB1216E A/F sensor 1 terminal ECM terminal Bank 1 1 16 2 75 Bank 2 1 35 2 56 Continuity should exist. Bank 1 Bank 2 A/F sensor 1 terminal ECM terminal A/F sensor 1 terminal ECM terminal 1 16 1 35 2 75 2 56 Continuity should not exist. BBIA0544E 2010 Pathfinder |