P0505 (blink 71) on Toyota Passo (KGC10): Idle Control System Malfunction

Short answer: P0505 means “Idle Control System Malfunction”. 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 harness between the stepper motor for ISC and the EFI ECU normal?.

Code

P0505 · blink 71

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 | K3-VE: M301 (Sirion 1.3 = JDM Boon M310S? / Passo QNC10)

Confidence

high (factory manual, export spec)

Source

carmanualsclub.com

Symptoms and when it is set

1. When the signals are deviated from the specified range continuously over a certain length of time

Likely causes

1. Open wire or short circuit for ISC system circuit
2. Stepper motor for ISC
3. EFI ECU

What to check, in order

1. Is the harness between the stepper motor for ISC and the EFI ECU normal?
2. Is the stepper motor for ISC operating normally?

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

• P0505 · Toyota Vitz (1st gen)
• P0505 · Toyota Corolla (9th gen, E120)
• P0505 · Toyota Corolla (11th gen, E170)
• P0505 · Toyota Corolla (10th gen, E140)
• P0505 · Honda City (5th gen, GM2)
• P0505 · Honda Civic (10th gen, FC)
• P0505 · Suzuki Wagon R (Pakistan, K10B)
• P0505 on all cars compared

← P0500/52 P0535/44 →

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.