P0401 (blink 79) on Toyota Passo (KGC10): Stepper Motor Type Egr Valve System Malfunction (Func

Short answer: P0401 means “Stepper Motor Type Egr Valve System Malfunction (Func”. The car’s computer has found a fault in the Engine control (EFI) system and turns on the Check engine light (MIL). First check: is the stepper motor for EGR operating normally?.

Code

P0401 · blink 79

System

Engine control (EFI)

Dashboard light

Check engine light (MIL)

Also sold as

Daihatsu Boon, Daihatsu Sirion (M300)

Applies to

1KR-FE: M300 (Sirion export = JDM Boon M300S/M301S(4WD? see gaps) & Passo KGC10/KGC15). JDM-spec ECU not separately documented

Confidence

high (factory manual, export spec)

Source

carmanualsclub.com

What to check, in order

1. Is the stepper motor for EGR operating normally?
2. Is the harness between the stepper motor for EGR and the EFI ECU normal? Because the freeze frame data records the engine conditions when the ma

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• P0401 · Toyota Corolla (11th gen, E170)
• P0401 · Toyota Corolla (10th gen, E140)
• P0401 · Honda City (5th gen, GM2)
• P0401 · Honda Civic (10th gen, FC)
• P0401 · Suzuki Wagon R (Pakistan, K10B)
• P0401 on all cars compared

← P0350/16 P0443/76 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.