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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (Engine Control System (A25A-FXS) - Diagnostic Codes (P0128-P0171)) >> SFI System >> DTC P012F-62: Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure [10/2022 - 11/2023] >> Procedure

DTC P012F-62: Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure [10/2022 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P012F-62) 
    1. Read the DTCs and record the Freeze Frame Data.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P012F-62 is output A
      DTC P012F-62 and other DTCs are output B

      HINT: 

      If any DTCs other than P012F-62 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART  . Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023]

    Result: 

    A 

    See step  2

  2. CHECK FREEZE FRAME DATA (COOLANT TEMPERATURE AND INTAKE AIR TEMPERATURE) 
    1. Using the GTS, read the values displayed in the Freeze Frame Data recorded in step 1.

      Powertrain > Engine > DTC (P012F-62) > Freeze Frame Data 

      Tester Display
      Coolant Temperature
      Intake Air Temperature
    2. Read the value displayed on the GTS.

      Standard

      GTS Display Specified Condition
      Difference between the Coolant Temperature and the Intake Air Temperature Within 15°C (27°F)

      HINT: 

      • When the engine is cold, the value of the engine coolant temperature, engine oil temperature and intake air temperature should be approximately the same.
      • If the result is not as specified, check that there are no heat sources such as a block heater in the engine compartment.
      • Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

        Refer to INITIALIZATION [10/2021 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    OK 

    See step  3

  3. CHECK FREEZE FRAME DATA (ENGINE OIL TEMPERATURE SENSOR AND INTAKE AIR TEMPERATURE) 
    1. Using the GTS, read the values displayed in the Freeze Frame Data recorded in step 1.

      Powertrain > Engine > DTC (P012F-62) > Freeze Frame Data 

      Tester Display
      Engine Oil Temperature Sensor
      Intake Air Temperature
    2. Read the value displayed on the GTS.

      Standard

      GTS Display Specified Condition
      Difference between the Engine Oil Temperature Sensor and the Intake Air Temperature Within 15°C (27°F)

      HINT: 

      When the engine is cold, the value of the engine coolant temperature, engine oil temperature and intake air temperature should be approximately the same.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    NG 

    REPLACE OIL PRESSURE AND TEMPERATURE SENSOR 

    Refer to REMOVAL [12/2019 - ]

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