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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-239 • The ECM <M/T> or PCM <A/T> must see this NOTE: Rapid voltage occurs due to fuel sloshing NOTE: The PCM determines that the engine is . • 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 STEP 1. Using scan tool MB991502, check data list item 73: CAUTION To prevent damage to scan tool MB991502, always turn the 73, Fuel Tank Differential Pressure Sensor. • The fuel tank pressures should be − 1.5 to 1.5kPa. (5) Connect an evaporative emission system pressure pump to the fuel filler neck, and apply pressure. • The scan tool reading should increase. Q: Is the scan tool reading within the specified value? YES : Go to Step 20. AC001252 MB991502 16 PIN AB AC000186 |