MFI System Inspection
MFI SYSTEM INSPECTIONIf the MFI system components (sensors, ECM, injector, etc.) fail, interruption or failure to supply the proper amount of fuel for various engine operating conditions will result. The following situations can 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 with the HI-SCAN.
NOTE
1. Before removing or installing any part, read the diagnostic trouble code and then disconnect the battery negative (-) terminal.
2. Before disconnecting the cable from battery terminal, turn the ignition switch to OFF. Removal or connection of battery cable during engine operation or while the ignition switch is ON could cause damage to the ECM.
3. The control harnesses between the ECM and heated oxygen sensor are shielded with the shield grounded wires to the body in order to prevent the influence of ignition noises and radio interference. When the shielded wire is faulty the control harness must be replaced.
4. When checking the generator for the charging state Do not disconnect the battery '+' terminal to prevent the ECM from damage due to the voltage.
5. When charging the battery with the external charger, disconnect the vehicle side terminals to prevent the ECM.