Engine Coolant Temperature Gauge Malfunction [10/2022 - ]: Procedure

CHECK CAN COMMUNICATION SYSTEM

Check if CAN communication DTCs are output.

for HV Model:

Refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023] , or refer to DIAGNOSIS SYSTEM [10/2023 - 11/2024] , or refer to DIAGNOSIS SYSTEM [11/2024 - ]

for Gasoline Model:

Refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023] , or refer to DIAGNOSIS SYSTEM [10/2023 - 11/2024] , or refer to DIAGNOSIS SYSTEM [11/2024 - ]

Result

Result	Proceed to
CAN communication DTCs are not output.	A
CAN communication DTCs are output.	B

Result:

B

GO TO CAN COMMUNICATION SYSTEM

for HV Model:

Refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023] , or refer to DIAGNOSIS SYSTEM [10/2023 - 11/2024] , or refer to DIAGNOSIS SYSTEM [11/2024 - ]

for Gasoline Model:

Refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023] , or refer to DIAGNOSIS SYSTEM [10/2023 - 11/2024] , or refer to DIAGNOSIS SYSTEM [11/2024 - ]

Result:

A

See step 2

CHECK FOR DTC (SFI SYSTEM)

Check if SFI system DTCs are output.

for A25A-FKS:

Refer to DTC CHECK / CLEAR [08/2020 - ]

for A25A-FXS:

Refer to DTC CHECK / CLEAR [10/2022 - ]

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
SFI system DTCs are not output.	A
SFI system DTC is output.	B

Result:

B

GO TO SFI SYSTEM

for A25A-FKS:

Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 10/2023] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2023 - 11/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2024 - ]

for A25A-FXS:

Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2024 - ]

Result:

A

See step 3

CHECK VEHICLE CONDITION

Check vehicle condition.

Result

Result	Proceed to
for 7 Inch Multi-information Display Type	A
for 12.3 Inch Multi-information Display Type	B

Result:

B

See step 5

Result:

A

See step 4

PERFORM ACTIVE TEST USING TECHSTREAM

Using the Techstream, perform the Active Test.

Refer to DATA LIST / ACTIVE TEST [10/2022 - ]

Body Electrical > Combination Meter > Active Test

Tester Display	Measurement Item	Control Range
Water Temperature Meter Operation (50C, 122F)	Engine coolant temperature receiver gauge 50°C (122°F)	ON
Water Temperature Meter Operation (60C, 140F)	Engine coolant temperature receiver gauge 60°C (140°F)	ON
Water Temperature Meter Operation (70C, 158F)	Engine coolant temperature receiver gauge 70°C (158°F)	ON
Water Temperature Meter Operation (80C, 176F)	Engine coolant temperature receiver gauge 80°C (176°F)	ON
Water Temperature Meter Operation (Middle)	Engine coolant temperature receiver gauge (Middle)	ON
Water Temperature Meter Operation (110C, 230F)	Engine coolant temperature receiver gauge 110°C (230°F)	ON
Water Temperature Meter Operation (120C, 248F)	Engine coolant temperature receiver gauge 120°C (248°F)	ON
Water Temperature Meter Operation (127C, 260F)	Engine coolant temperature receiver gauge 127°C (260°F)	ON

Body Electrical > Combination Meter > Active Test

Tester Display
Water Temperature Meter Operation (50C, 122F)

Body Electrical > Combination Meter > Active Test

Tester Display
Water Temperature Meter Operation (60C, 140F)

Body Electrical > Combination Meter > Active Test

Tester Display
Water Temperature Meter Operation (70C, 158F)

Body Electrical > Combination Meter > Active Test

Tester Display
Water Temperature Meter Operation (80C, 176F)

Body Electrical > Combination Meter > Active Test

Tester Display
Water Temperature Meter Operation (Middle)

Body Electrical > Combination Meter > Active Test

Tester Display
Water Temperature Meter Operation (110C, 230F)

Body Electrical > Combination Meter > Active Test

Tester Display
Water Temperature Meter Operation (120C, 248F)

Body Electrical > Combination Meter > Active Test

Tester Display
Water Temperature Meter Operation (127C, 260F)

OK

Engine coolant temperature receiver gauge indication is normal.

GTY973688

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Water Temperature Meter Operation (50C, 122F)
*b	Water Temperature Meter Operation (60C, 140F)
*c	Water Temperature Meter Operation (70C, 158F)
*d	Water Temperature Meter Operation (80C, 176F)
*e	Water Temperature Meter Operation (Middle)
*f	Water Temperature Meter Operation (110C, 230F)
*g	Water Temperature Meter Operation (120C, 248F)
*h	Water Temperature Meter Operation (127C, 260F)

Result

Proceed to
OK
NG

Result:

OK

REPLACE ECM

for A25A-FKS:

Refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

for A25A-FXS:

Refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

NG

REPLACE COMBINATION METER ASSEMBLY

Refer to REMOVAL [10/2022 - ]

READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)

Using the Techstream, read the Data List.

Refer to DATA LIST / ACTIVE TEST [10/2022 - ]

Body Electrical > Combination Meter > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature	Min.: 0°C (0°F), Max.: 127.5°C (261.5°F)	75 to 100°C (167 to 212°F): After warming up the engine	-

Body Electrical > Combination Meter > Data List

Tester Display
Coolant Temperature

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Coolant Temperature

Engine coolant temperature

Min.: -40°C (-40°F), Max.: 140°C (284°F)

75 to 100°C (167 to 212°F): After warming up

This is the engine oil temperature.
for Gasoline Model:
HINT:

After warming up the engine, the engine oil temperature will be 80 to 110°C (176 to 230°F).
After a long soak, the engine oil temperature, intake air temperature and ambient air temperature will be approximately equal.
If the value is -40°C (-40°F), or higher than 168°C (334°F), the sensor circuit is open or shorted.

for HV Model:
HINT:

After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

When the Data List values of the ECUs match, an internal malfunction of the ECM is suspected.
When the Data List values of the ECUs do not match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected.

OK

The Data List values of the ECUs do not match.

Result

Proceed to
OK
NG

Result:

OK

REPLACE ECM

for A25A-FKS:

Refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

for A25A-FXS:

Refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

NG

REPLACE COMBINATION METER ASSEMBLY

Refer to REMOVAL [10/2022 - ]