P0403 (blink 79) on Toyota Passo (KGC10): Stepper-motor EGR valve open wire (2-trip)

Short answer: P0403 means “Stepper-motor EGR valve open wire (2-trip)”. The car’s computer has found a fault in the Engine control (EFI) system and turns on the Check engine light (MIL). First check: see manual chart.

Code

P0403 · 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

Symptoms and when it is set

1. MIL per chart B8-52..55

Likely causes

1. Open/short in EGR stepper signal system

What to check, in order

1. See manual chart

Related on this car

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

← P0303/17 P1349/73 →

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.