Engine Coolant Temperature Gauge Malfunction [02/2024 - ]: Procedure

1. Check if CAN communication DTCs are output.

   Refer to DIAGNOSIS SYSTEM [02/2024 - ]

   Result

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

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2024 - ] 

Result: 

A 

See step  2

1. Check for SFI system DTCs are output.

   Powertrain > Engine > Trouble Codes 

   Result

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

Result: 

B 

GO TO SFI SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [02/2024 - ] 

Result: 

A 

See step  3

1. Using the GTS, read the Data List.

   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.: 127.0°C (260.6°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 115°C (167 to 239°F): After warming up	This is the engine coolant temperature. 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, an internal malfunction of the combination meter assembly is suspected.

   OK

   The Data List values of the ECUs do match.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [02/2024 - ] 

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [02/2024 - ]