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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-693 NOTE: If the number of sudden pressure fluctua- . • Engine speed is greater than 2,500 r/min. • Vehicle speed is 15 km/h (9.3 mph) or • Volumetric efficiency is 55 percent or greater. . OBD-ll DRIVE CYCLE PATTERN − OBD-ll Drive Cycle − Procedure 1 − Evaporative Emission System Leak . TROUBLESHOOTING HINTS (The most likely • Malfunction of the fuel tank differential pressure sensor. • A damaged harness in the fuel tank differential pressure sensor circuit. • Malfunction of the PCM. . OVERVIEW OF TROUBLESHOOTING • DTC P0451 can be set by a faulty fuel tank differ- ential pressure sensor or related circuit, or PCM • To check for system blockage, do a performance test which uses a mechanical vacuum gauge and |