SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P268172, P268173

DTC Code	DTC Name
P268172	Engine Coolant Bypass Valve Actuator Stuck Open
P268173	Engine Coolant Bypass Valve Actuator Stuck Closed

DESCRIPTION

Tech Tips

These DTCs are applicable to models w/ Flow Shutting Valve only.

Refer to DTC P268111.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P268172	Engine Coolant Bypass Valve Actuator Stuck Open	The difference between the value of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor is 3°C (5°F) or less for 3 seconds or more (2 trip detection logic).	Engine coolant level low Air in cooling system (for Engine) Engine coolant leak Flow shutting valve (water valve) Water inlet with thermostat sub-assembly (thermostat) Engine coolant temperature sensor No. 2 engine coolant temperature sensor Engine water pump assembly	Does not come on	DTC stored	SAE Code: P26AB
P268173	Engine Coolant Bypass Valve Actuator Stuck Closed	Either of the following conditions is met for 3 seconds or more (2 trip detection logic): The engine coolant temperature is less than 74°C (165°F) and the difference between the value of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor is 6°C (11°F) or more. The engine coolant temperature is 74°C (165°F) or more and the difference between the value of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor is 15.5°C (28°F) or more.	Engine coolant level low Air in cooling system (for Engine) Engine coolant leak Flow shutting valve (water valve) Water inlet with thermostat sub-assembly (thermostat) Engine coolant temperature sensor No. 2 engine coolant temperature sensor Engine water pump assembly	Does not come on	DTC stored	SAE Code: P26B1

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P268172

Engine Coolant Bypass Valve Actuator Stuck Open

The difference between the value of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor is 3°C (5°F) or less for 3 seconds or more (2 trip detection logic).

Engine coolant level low
Air in cooling system (for Engine)
Engine coolant leak
Flow shutting valve (water valve)
Water inlet with thermostat sub-assembly (thermostat)
Engine coolant temperature sensor
No. 2 engine coolant temperature sensor
Engine water pump assembly

Does not come on

DTC stored

SAE Code: P26AB

P268173

Engine Coolant Bypass Valve Actuator Stuck Closed

Either of the following conditions is met for 3 seconds or more (2 trip detection logic):

The engine coolant temperature is less than 74°C (165°F) and the difference between the value of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor is 6°C (11°F) or more.
The engine coolant temperature is 74°C (165°F) or more and the difference between the value of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor is 15.5°C (28°F) or more.

Engine coolant level low
Air in cooling system (for Engine)
Engine coolant leak
Flow shutting valve (water valve)
Water inlet with thermostat sub-assembly (thermostat)
Engine coolant temperature sensor
No. 2 engine coolant temperature sensor
Engine water pump assembly

Does not come on

DTC stored

SAE Code: P26B1

MONITOR DESCRIPTION

P268172:

If the difference between the value of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor is less than 3°C (5°F) but the target operating state of the flow shutting valve (water valve) is closed, the ECM will determine that the flow shutting valve (water valve) is stuck open and store a DTC.

P268173:

If the difference between the value of the engine coolant temperature sensor and No. 2 engine coolant temperature sensor is more than the threshold but the target operating state of the flow shutting valve (water valve) is open, the ECM will determine that the flow shutting valve (water valve) is stuck closed and store a DTC.

CONFIRMATION DRIVING PATTERN

P268172

Tech Tips

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

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).

Click here
Enter the following menus: Powertrain / Engine / Data List / Coolant Water Route Switching Valve.
Start the engine and check that the value of the Data List item Coolant Water Route Switching Valve is "Close".
Warm up the engine until the value of the Data List item Coolant Water Route Switching Valve is "Open".
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
Tech Tips
- 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: P268172.

Check the DTC judgment result.

GTS 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
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tech Tips

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 or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

P268173

Tech Tips

When performing this procedure, start the engine when the coolant temperature is less than 40°C (104°F).

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).

Click here
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
Start the engine.
Start the engine and warm it up until the engine coolant temperature reaches 80°C (176°F).
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
Tech Tips
- 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: P268173.

Check the DTC judgment result.

GTS 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
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tech Tips

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 or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

CAUTION / NOTICE / HINT

Note

Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

Click here

(Select Powertrain in Health Check and then check the time stamp data.)

Click here
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

Click here

Tech Tips

When replacing any cooling system (for Engine) parts, if excessive deposits of rust or scale exist or the concentration of the engine coolant is abnormal, replace the engine coolant.

Click here
Read freeze frame data using the GTS. 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.

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P268172 OR P268173)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTC P268172 or P268173 is output	A
DTC P268172 or P268173 and other DTCs are output	B

Tech Tips

If DTC P268173 and P26819C are output simultaneously, perform troubleshooting for DTC P268173 first.
If DTC P268172 and P26819C are output simultaneously, perform troubleshooting for DTC P26819C first.

Click here
If any DTCs other than DTC P268172, P268173 or P26819C are output, perform troubleshooting for those DTCs first.

GO TO DTC CHART Click here

CHECK RESERVE SEALED TANK WITHOUT CAP (ENGINE COOLANT LEVEL)

Check that the engine coolant level is between the FULL and LOW lines.

OK
The engine coolant is not excessively low.

Tech Tips

Make sure that there are no signs of the engine overheating.

Result

Proceed to
OK
NG

GO TO STEP 6 Click here

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

Repair any engine coolant leaks.

Tech Tips

Add engine coolant and perform air bleeding after repair.

Click here

Result

Proceed to
NEXT

CLEAR DTC

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the power switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P268172 OR P268173)

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
P268172 or P268173 is output	B

END

PERFORM ACTIVE TEST USING GTS (ACTIVATE THE ELECTRIC WATER PUMP)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Active Test / Activate the Electric Water Pump / Data List / Electric Water Pump.

Powertrain > Engine > Active Test

Active Test Display

Activate the Electric Water Pump

Data List Display

Electric Water Pump

Active Test Display
Activate the Electric Water Pump

Data List Display
Electric Water Pump

Perform the Active Test according to the display on the GTS and lightly squeeze a radiator hose by hand to check for a pulsing feeling.

OK
Pulsing can be felt in a radiator hose.

Tech Tips

If pulsing cannot be felt in a radiator hose, inspect the engine water pump assembly. If the impeller is damaged, replace the engine water pump assembly.

Result

Proceed to
OK
NG

INSPECT ENGINE WATER PUMP ASSEMBLY (VISUAL INSPECTION OF IMPELLER) Click here

READ VALUE USING GTS (COOLANT TEMPERATURE AND HEATER COOLANT TEMPERATURE SENSOR)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature and Heater Coolant Temperature Sensor.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature
Heater Coolant Temperature Sensor

Start the engine.

Read the value displayed on the GTS.

OK
The values of Data List items Coolant Temperature and Heater Coolant Temperature Sensor change over time and do not get stuck on a certain value.

Result

Result	Proceed to
The value of Coolant Temperature does not change	A
The value of Heater Coolant Temperature Sensor does not change	B
Other than above	C

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here Perform "Inspection After Repair" after replacing the engine coolant temperature sensor. Click here

REPLACE NO. 2 ENGINE COOLANT TEMPERATURE SENSOR Click here

PERFORM ACTIVE TEST USING GTS (CONTROL THE ENGINE COOLING FAN)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode
Start the engine and warm it up with the A/C switch and all other accessories off until the engine coolant temperature reaches 85°C (185°F).

Tech Tips

Warm up the engine until the engine coolant temperature reaches the water inlet with thermostat sub-assembly opening temperature.

Tester Display
Inspection Mode

Enter the following menus: Powertrain / Engine / Active Test / Control the Engine Cooling Fan / Data List / Coolant Temperature, Engine Cooling Fan.

Powertrain > Engine > Active Test

Active Test Display
Control the Engine Cooling Fan

Data List Display
Coolant Temperature
Engine Cooling Fan

Read the Data List while performing the Active Test with the engine idling.

OK
The engine coolant temperature does not decrease to 70°C (158°F) or less.

Tech Tips

While performing the Active Test, if the engine coolant temperature decreases to 70°C (158°F) or less, the water inlet with thermostat sub-assembly may be stuck open.

Result

Control the Engine Cooling Fan

(Active Test)

Coolant Temperature

(Data List)

Water Inlet with Thermostat Sub-assembly Operation

Proceed to

High

Higher than 70°C (158°F)

Normal

70°C (158°F) or less

Stuck open

CHECK AND REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY Click here

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Inspect the engine coolant temperature sensor.

Click here

Tech Tips

If the result of the engine coolant temperature sensor inspection differs greatly from the specified value, inspect the water inlet with thermostat sub-assembly.

Result

Proceed to
OK
NG

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here Perform "Inspection After Repair" after replacing the engine coolant temperature sensor. Click here

INSPECT NO. 2 ENGINE COOLANT TEMPERATURE SENSOR

Inspect the No. 2 engine coolant temperature sensor.

Click here

Result

Proceed to
OK
NG

REPLACE NO. 2 ENGINE COOLANT TEMPERATURE SENSOR Click here

REPLACE FLOW SHUTTING VALVE (WATER VALVE)

Replace the flow shutting valve (water valve).

Tech Tips

Click here
When replacing any cooling system (for Engine) parts, if excessive deposits of rust or scale exist or the concentration of the engine coolant is abnormal, replace the engine coolant.

Click here

Result

Proceed to
NEXT

CLEAR DTC

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the power switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P268172 OR P268173)

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

OK
DTCs are not output.

Result

Proceed to
NEXT

END

INSPECT ENGINE WATER PUMP ASSEMBLY (VISUAL INSPECTION OF IMPELLER)

*1	Engine Water Pump Assembly
*2	Impeller

Visually inspect the impeller for damage.

OK
The impeller is not damaged.

Tech Tips

If the impeller is damaged, replace the engine water pump assembly.

Click here

Result

Proceed to
NEXT

END