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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-269 C D E F G H I J K L M A EC Diagnostic Procedure EBS00MCP 1. CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle. 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. SEC502D |