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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-307 • The ECM <M/T> or PCM <A/T> must see this NOTE: Rapid voltage occurs due to fuel sloshing NOTE: The ECM <M/T> or PCM <A/T> . • Engine speed is higher than 2,500 r/min. • Vehicle speed is 15 km/h (9.3 mph) or more. • Volumetric efficiency is 55 percent or more. TROUBLESHOOTING HINTS • Fuel tank differential pressure sensor failed. • Open or shorted fuel tank differential pressure • ECM failed <M/T>. • PCM failed <A/T>. • Blockage of evaporative emission system OVERVIEW OF TROUBLESHOOTING • The DTC P0450 can be set if either of the 1. Faulty fuel differential pressure sensor, related circuit, or ECM <M/T> or PCM <A/T>. 2. Faulty fuel filler neck evaporative emission ventilation solenoid or blocked vapor line. • To check a system blockage, do a performance DIAGNOSIS Required Special Tools: • MB991502: Scan Tool (MUT-II) • MB991658: Test Harness Set |