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Home >> Toyota >> 2017 >> 4Runner TRD Pro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (P0010-P0128) >> SFI System >> DTC P0116: Engine Coolant Temperature Circuit Range / Performance Problem [08/2015 - ] >> Procedure
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DTC P0116: Engine Coolant Temperature Circuit Range / Performance Problem [08/2015 - ]: Procedure

  1. CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
    5. Read the DTCs.
      RESULT

      Display (DTC Output) Proceed to
      P0116 A
      P0116 and other DTCs B

    Result: 

    GO TO DTC CHART 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 08/2019] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - ] )

    Result: 

    See step  2

  2. INSPECT THERMOSTAT 
    1. Remove the thermostat (Refer to REMOVAL [08/2015 - ] ).
    2. Measure the valve opening temperature of the thermostat.

      Standard value

      80°C to 84°C (176°F to 183°F)

      HINT: 

      In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

    3. Reinstall the thermostat (Refer to INSTALLATION [08/2015 - ] ).

    Result: 

    OK 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPLACE THERMOSTAT 

    (Refer to REMOVAL [08/2015 - ] )