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Home >> Lexus >> 2011 >> IS 250 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0010-P014F)) >> SFI System >> DTC P0116: Engine Coolant Temperature Circuit Range / Performance Problem >> Procedure
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DTC P0116: Engine Coolant Temperature Circuit Range / Performance Problem: Procedure

  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0116) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read the DTC.

      Result

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

    B → See step   4 

    A: Go to next step 

  2. INSPECT THERMOSTAT 
    1. Remove the thermostat. Refer to REMOVAL .
    2. Check the valve opening temperature of the thermostat.

      Standard

      80 to 84°C (176 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 .

    NG → See step   5 

    OK → See step   3 

  3. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL 
  4. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  5. REPLACE THERMOSTAT. Refer to  REMOVAL