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Home >> Lexus >> 2015 >> GS 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (1 Of 4) >> SFI System >> DTC P0115: Engine Coolant Temperature Circuit Malfunction; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input [09/2014 - 10/2015] >> Procedure
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DTC P0115: Engine Coolant Temperature Circuit Malfunction; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input [09/2014 - 10/2015]: Procedure

  1. READ VALUE USING TECHSTREAM (COOLANT TEMP) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
    5. Read the value displayed on the Techstream.

      Standard

      Between 75 and 100°C (167 and 212°F) with warm engine.

      Result

      Result Proceed to
      Displayed temperature is -40°C (-40°F) A
      Displayed temperature is higher than 135°C (275°F) B
      Between 75 to 100°C (167 and 212°F) C

      HINT: 

      • If there is an open circuit, the Techstream indicates -40°C (-40°F).
      • If there is a short circuit, the Techstream indicates higher than 135°C (275°F).

    Result: 

    B 

    See step  4

    Result: 

    C 

    CHECK FOR INTERMITTENT PROBLEMS 

    (Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2014 - 10/2015] )

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
    1. Confirm good connection at the engine coolant temperature sensor connector.
      GTY536593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Coolant Temperature Sensor *2 ECM
      *a Front view of wire harness connector
      (to Engine Coolant Temperature Sensor)      		 - -
    2. Disconnect the engine coolant temperature sensor connector.
    3. Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
    4. Connect the Techstream to the DLC3.
    5. Turn the engine switch on (IG).
    6. Turn the Techstream on.
    7. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
    8. Read the value displayed on the Techstream.

      Standard

      Higher than 135°C (275°F)

    9. Reconnect the engine coolant temperature sensor connector.

      HINT: 

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (Refer to INITIALIZATION [09/2014 - 10/2015] ).

    Result: 

    OK 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 
    1. Disconnect the engine coolant temperature sensor connector.
    2. Disconnect the ECM connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      F59-2- F1-19 (THW) Always Below 1 Ω
      F59-1 - F1-28 (E2) Always Below 1 Ω
    4. Reconnect the engine coolant temperature sensor connector.
    5. Reconnect the ECM connectors.

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 

  4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
    1. Disconnect the engine coolant temperature sensor connector.
      GTY254119Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Coolant Temperature Sensor
      *2 ECM
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
    6. Read the value displayed on the Techstream.

      Standard

      -40°C (-40°F)

    7. Reconnect the engine coolant temperature sensor connector.

      HINT: 

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (Refer to INITIALIZATION [09/2014 - 10/2015] ).

    Result: 

    OK 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 
    1. Disconnect the engine coolant temperature sensor connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      F59-2 or F1-19 (THW) - Body ground Always 10 kΩ or higher
    4. Reconnect the engine coolant temperature sensor connector.
    5. Reconnect the ECM connector.

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [09/2014 - 10/2015] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 

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