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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-1431 [VG33ER] C D E F G H I J K L M A EC Diagnostic Procedure UBS00DW2 1. CHECK EXHAUST AIR LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust air 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 or NG OK >> GO TO 3. NG >> Repair or replace. 3. CHECK FOR PCV HOSE Check PCV hose for loose connection or disconnection. OK or NG OK >> GO TO 4. NG >> Repair or replace. SEC502D |