MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI) <3.0L>
STEP 23. Check for clogging in the evaporative emission
evaporative emission canister.
(2) Plug the other two nipples or loop a hose between the other
(3) Apply a vacuum, when each nipple is unplugged, the
vacuum should fluctuate.
Q: Does the vacuum pump gauge reading fluctuate?
YES : Reinstall the fuel tank. Then go to step 32.
the fuel tank. Then perform the OBD-II drive
STEP 24. Check for clogging in the evaporator line hose F.
connect a hand vacuum pump to hose F at the floor pipe
(2) Apply vacuum.
NOTE: The vacuum should be 40 kPa (5.8 psi) or less.
(3) Use scan tool MB991502 to activate the evaporative
emission purge solenoid valve. The vacuum should leak.
Q: Is the vacuum maintained inside the evaporator line?
STEP 25. Check for clogging in the evaporator line hose C
from hose C to hose E.
Q: Are there any clogs?
YES : Replace that hose, and perform the purgeflow check.
(Refer to GROUP 17, Purge Control System
NO : perform the OBD-II drive cycle