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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-347 STEP 28. Check the check valve A. shown, it should pass air. (2) When you blow the check valve, on air should leak from the check valve body. Q: Is there any failure? YES : Replace it, then perform the OBD-II drive cycle . NO : Go to Step 29. STEP 29. Check the check valve B. shown above, it should pass more air. (2) When you blow the check valve from the arrow direction shown below, it should pass less air. (3) When you blow the check valve, on air should leak from the check valve body. Q: Is there any failure? YES : Replace it, then perform the OBD-II drive cycle . NO : Go to Step 30. STEP 30. Check for clogging in the evaporator line from from hose J to hose K. Q: Are there any clogs? YES : Replace that hose, reinstall the filler neck assembly and filler neck protector, and perform the OBD-II drive NO : Go to Step 31. AC002076 AB CHECK VALVE A AC002078 CHECK VALVE B AB AC002033 AB HOSE K HOSE J |