1. The engine starts with difficulty or does not start.
2. The engine runs unsteadily at idle.
3. The engine operates unstably in all modes.
If any of the above situations occur, first perform a routine diagnostic (ignition system, engine adjustment, etc.), then check the MFI system components with the HI–SCAN scanner.
- Before removing or replacing any system component, read the fault codes, then disconnect the cable from the negative terminal of the battery.
- Before disconnecting the cable from the negative battery terminal, turn off the ignition. Disconnecting the wire while the engine is running or the ignition is on may damage the ECM.
- The connection between the oxygen sensor and the ECM is made with a shielded wire to reduce possible interference with radio reception from the ignition system. If the shielding braid is damaged, the wire must be replaced.
- When checking the generator, do not disconnect the positive battery cable to avoid damaging the ECM.
- When charging a battery installed in a vehicle from an external source, to avoid damaging the ECM, first disconnect the vehicle's on-board network wires from the battery terminals.