MFI System Inspection

If the MFI system components (sensors, ECM, injector, etc.) fail, the interruption or failure to supply the proper amount of
fuel for various engine operating conditions will result. The following situations may be encountered.
1. Engine is hard to start or does not start at all.
2. Unstable idle
3. Poor driveability

If any of the above conditions is noted, first perform an inspection by self-diagnosis and subsequent basic engine checks (ignition system malfunction, incorrect engine adjustment, etc.), and then inspect the MFI system components.