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Home >> Lexus >> 2021 >> LS 500h AWD >> Repair and Diagnosis >> Electrical >> Gauges >> Meter / Gauge System - Diagnostic Codes (3 Of 3) & Symptom Tests (1 Of 2) >> Meter / Gauge System >> Engine Coolant Temperature Receiver Gauge Malfunction [10/2017 - ] >> Procedure

Engine Coolant Temperature Receiver Gauge Malfunction [10/2017 - ]: Procedure

  1. CHECK FOR DTC 
    1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - 09/2018]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2018 - 10/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2020 - 11/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 10/2023]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK FOR DTC (SFI SYSTEM) 
    1. Check for DTCs.

      w/ Canister pump module: Refer to DTC CHECK / CLEAR [10/2017 - 10/2020] , or refer to DTC CHECK / CLEAR [10/2020 - 10/2023] , or refer to DTC CHECK / CLEAR [10/2023 - ]

      w/o Canister pump module: Refer to DTC CHECK / CLEAR [10/2017 - 10/2020] , or refer to DTC CHECK / CLEAR [10/2020 - 10/2023] , or refer to DTC CHECK / CLEAR [10/2023 - ]

      Powertrain > Engine > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Result Proceed to
      OK A
      NG (w/ Canister pump module) B
      NG (w/o Canister pump module) C

    Result: 

    GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

    Result: 

    GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

    Result: 

    See step  3

  3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE) 
    1. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [10/2017 - 10/2020] , or refer to DATA LIST / ACTIVE TEST [10/2020 - 11/2021] , or refer to DATA LIST / ACTIVE TEST [11/2021 - 10/2023] , or refer to DATA LIST / ACTIVE TEST [10/2023 - ]

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature Min.: 0°C, Max.: 127.0°C or Unset 75 to 100°C: After warming up 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: 215°C (419°F) 75 to 100°C (167 to 212°F): After warming up the engine 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, 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. Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 10/2023]  , or refer to  REMOVAL [10/2023 - ]