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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-737 OVERVIEW OF TROUBLESHOOTING • DTC P0453 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 DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A • MB991658: Test Harness Set • MB991923: Power Plant ECU Check Harness |