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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-780 (5) Set scan tool MB991958 to the data reading mode. • Item 73, Fuel Tank Differential Pressure Sensor. • The fuel tank pressure reading on the scan tool should be −1.5 to 1.5 kPa (−0.443 to 0.443 inHg). (6) Connect the evaporative emission system pressure pump (Miller number 6872A) to the fuel tank filler tube by using • The fuel tank pressure reading should increase. (7) Turn the ignition switch to the "LOCK" (OFF) position. Then disconnect scan tool MB991958. (8) Remove the evaporative emission system pressure pump (Miller number 6872A) and the fuel tank adapter (9) Connect hose H to the evaporative emission canister. −1.5 and 1.5 kPa ( −0.443 and 0.443 inHg)? YES : It can be assumed that this malfunction is intermittent (Refer to GROUP 00, How to Use − How to Cope with Intermittent Malfunctions ). Go to Step 17. NO : Go to Step 2. AC306661 |