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Home >> Lexus >> 2017 >> LS 460 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System - Diagnostic Codes (P0010-P0230) >> SFI System >> DTC P0115: Engine Coolant Temperature Circuit; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input [09/2015 - ] >> Procedure
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DTC P0115: Engine Coolant Temperature Circuit; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input [09/2015 - ]: 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 / Data List / All Data / Coolant Temp.
    5. Read the value displayed on the Techstream.

      Standard

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

      Result

      Temperature Displayed Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      Between 80°C and 97°C (176°F and 207°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 140°C (284°F) or higher.

    Result:  B

    B 

    See step  4

    Result:  C

    C 

    CHECK FOR INTERMITTENT PROBLEMS 

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

    Result:  A

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN SENSOR) 
    1. Disconnect the E14 Engine Coolant Temperature (ECT) sensor connector.
      GTY651086Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.
    3. Connect the Techstream to the DLC3.
    4. Turn the engine switch on (IG).
    5. Turn the Techstream on.
    6. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
    7. Read the value displayed on the Techstream.

      Standard

      140°C (284°F) or higher.

      HINT: 

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

    Result:  OK

    OK 

    CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  NG

    NG 

    See step  3

  3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM) 
    1. Disconnect the E14 ECT sensor connector.
      GTY670107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals THW and E2 of the E1 ECM connector.

      HINT: 

      Before checking, do visual and contact pressure checks on the ECM connector.

    3. Connect the Techstream to the DLC3.
    4. Turn the engine switch on (IG).
    5. Turn the Techstream on.
    6. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
    7. Read the value displayed on the Techstream.

      Standard

      140°C (284°F) or higher.

    Result:  NG

    NG 

    CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  OK

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN SENSOR) 
    1. Disconnect the E14 ECT sensor connector.
      GTY620835Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 / Data List / All Data / Coolant Temp.
    6. Read the value displayed on the Techstream.

      Standard

      -40°C (-40°F)

      HINT: 

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

    Result:  OK

    OK 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  NG

    NG 

    See step  5

  5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN ECM) 
    1. Disconnect the E1 ECM connector.
      GTY636183Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 / Data List / All Data / Coolant Temp.
    6. Read the value displayed on the Techstream.

      Standard

      -40°C (-40°F)

    Result:  NG

    NG 

    REPLACE ECM 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  OK

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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