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P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-653 < COMPONENT DIAGNOSIS > [VK56DE] 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 1. Listen for an intake air leak after the mass air flow sensor. 2. Check PCV hose connection. OK or NG 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 the following terminals. 5. Check harness continuity between the following terminals and ground. PBIB1216E 1. A/F sensor 1 (bank 2) harness connector 2. A/F sensor 1 (bank 2) 3. A/F sensor 1 (bank 1) 4. A/F sensor 1 (bank 1) harness connector : Vehicle front A/F sensor 1 terminal ECM terminal Bank 1 1 35 2 56 Bank 2 1 16 2 75 Continuity should exist. ALBIA0360ZZ |