P0403 · blink 79 – Stepper-motor EGR valve open wire (2-trip)
- System
- Engine control (EFI)
- Dashboard light
- Check engine light (MIL)
- Check-engine blink code
- 79
- Applies to
- 1KR-FE: M300 (Sirion export = JDM Boon M300S/M301S(4WD? see gaps) & Passo KGC10/KGC15). JDM-spec ECU not separately documented
- Description
- Stepper-motor EGR valve open wire (2-trip)
- Detection / symptoms
- MIL per chart B8-52..55
- Possible causes
- Open/short in EGR stepper signal system
- What to check
- See manual chart
- Confidence
- high (factory manual, export spec)
From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights