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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-689 STEP 12. Test the OBD-II drive cycle. Diagnostic Function − OBD-II Drive Cycle − Procedure 6 − Other Monitor (2) Check the diagnostic trouble code (DTC). YES : Retry the troubleshooting. DTC P0451: Evaporative Emission System Pressure Sensor Range/Performance AC306278 A B C D E F G O P Q N M L H I J K AC INTAKE MANIFOLD PLENUM FUEL TANK EVAPORATIVE EMISSION CHECK VALVE EVAPORATIVE EMISSION EVAPORATIVE ONBOARD REFUELING FUEL TANK DIFFERENTIAL SYSTEM DIAGRAM CHAMBER |