P0505 · blink 71 – Idle Control System Malfunction

System: Engine control (EFI)
Dashboard light: Check engine light (MIL)
Check-engine blink code: 71
Applies to: 1KR-FE: M300 (Sirion export = JDM Boon M300S/M301S(4WD? see gaps) & Passo KGC10/KGC15). JDM-spec ECU not separately documented | K3-VE: M301 (Sirion 1.3 = JDM Boon M310S? / Passo QNC10)
Description: Idle Control System Malfunction
Detection / symptoms: Detection: 1.When the signals are deviated from the specified range continuously over a certain length of time,
Possible causes: Trouble area: 1.Open wire or short circuit for ISC system circuit 2.Stepper motor for ISC 3.EFI ECU
What to check: Checking points: 1.Is the harness between the stepper motor for ISC and the EFI ECU normal? 2.Is the stepper motor for ISC operating normally?; Unit check B8-222: warm idle 750 (+100/-50) rpm, no A/C or electrical load
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