P0401 · blink 79 – Stepper Motor Type Egr Valve System Malfunction (Func
- 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 Type Egr Valve System Malfunction (Func
- Detection / symptoms
- Detection:
- Possible causes
- Trouble area:
- What to check
- Checking points: 1.Is the stepper motor for EGR operating normally? 2.Is the harness between the stepper motor for EGR and the EFI ECU normal? NOTE • Read the freeze frame data, using the diagnosis tester (DS-21/DS-@) or OBD @ generic scan tool. Because the freeze frame data records the engine conditions when the ma
- 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