Engine Coolant Temperature Gauge Malfunction [12/2021 - ]: Procedure

1. Check if CAN communication DTCs are output.

   Refer to DIAGNOSIS SYSTEM [12/2021 - ]

   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 [12/2021 - ] 

Result: 

A 

See step  2

1. Check if SFI system DTCs are output.

   Powertrain > Engine > Trouble Codes 

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO SFI SYSTEM 

w/ Canister Pump Module: Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2021 - 10/2023] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ]

w/o Canister Pump Module: Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2021 - ]

Result: 

OK 

See step  3

1. Using the GTS, perform the Active Test.

   Body Electrical > Combination Meter > Active Test 

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

   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)

   1. [Display]: Engine coolant temperature receiver gauge

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   OK

   Engine coolant temperature receiver gauge indication is normal.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [12/2021 - ] 

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2021 - ]