- Inspect fuel pressure
- Inspect Engine Coolant Temperature Sensor (ECTS) and circuit (Check the DTC)
- Inspect long-term fuel trim and short-term fuel trim
- Inspect idle speed control system (Check the DTC)
- Inspect and test Electronic Throttle Control (ETC) module
- Inspect injector
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- Check the DTC
- Low fuel pressure
- Intake air leakage
- Contaminated fuel
- Weak sparks when ignited
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