P0115 (blink 42) on Toyota Passo (KGC10): Engine Coolant Temperature Sensor (Ect) Circuit Malfunc

Short answer: P0115 means “Engine Coolant Temperature Sensor (Ect) Circuit Malfunc”. The car’s computer has found a fault in the Engine control (EFI) system and turns on the Check engine light (MIL). First check: are the signals from the water temperature sensor inputted to the EFI ECU?.

Code

P0115 · blink 42

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 from the water temperature sensor are not outputted continuously after starting over a certain length of time:

Likely causes

1. Open wire or short circuit in the engine coolant temperature sensor circuit
2. Engine coolant temperature sensor
3. EFI ECU

What to check, in order

1. Are the signals from the water temperature sensor inputted to the EFI ECU?
2. Is the harness between the water temperature sensor and the EFI ECU normal?
3. Is the output of the water temperature sensor normal?

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

• P0115 · Toyota Vitz (1st gen)
• P0115 · Toyota Corolla (9th gen, E120)
• P0115 · Toyota Corolla (11th gen, E170)
• P0115 · Toyota Corolla (10th gen, E140)
• P0115 · Honda City (5th gen, GM2)
• P0115 · Honda Civic (10th gen, FC)
• P0115 · Suzuki Wagon R (Pakistan, K10B)
• P0115 on all cars compared

← P0110/43 P0120/41 →

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.