M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P268111,P268115; Engine Coolant Bypass Valve Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023

The flow shutting valve (for heater control) used for the variable cooling system is a magnet type valve that is closed when the engine is warming up to prevent coolant from flowing through the heater passage which reduces engine warm up time.

Related Data List

MONITOR DESCRIPTION

for K120

If the ignition switch is ON or the engine is running and the current operating state and target operating state of the flow shutting valve (for heater control) do not match, the ECM determines that there is an open or short in the flow shutting valve (for heater control) circuit and stores a DTC.

for K121

The ECM monitors the output voltage while the flow shutting valve (for heater) is operating.

The flow shutting valve (for heater) turns on and off according to ON/OFF switching of a transistor inside the ECM.

If a continuous mismatch occurs between the ECM transistor state and the output voltage, the ECM determines there is a malfunction in the flow shutting valve (for heater) circuit and stores a DTC.

CONFIRMATION DRIVING PATTERN

Make sure to perform this procedure when the engine coolant temperature is between 5 and 40°C (41 and 104°F) and the difference between the engine coolant temperature and intake air temperature is within 10°C (18°F) or less.

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Active Test / Activate the Coolant Water Route Switching Valve.
Perform the Active Test Activate the Coolant Water Route Switching Valve, select "Close" and wait for 3 seconds or more.
Perform the Active Test Activate the Coolant Water Route Switching Valve, select "Open" and wait for 3 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P268111 or P268115.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

HINT:

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Inspect the fuses for circuits related to this system before performing the following procedure.

Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

DESCRIPTION

Related Data List

MONITOR DESCRIPTION

for K120

for K121

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE