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Home >> Scion >> 2010 >> xD Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0010-P0351) >> 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 >> 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: Procedure

  1. READ VALUE USING TECHSTREAM (ENGINE COOLANT TEMPERATURE) 
    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 / Data List / All Data / Coolant Temp.
    5. Read the value displayed on the tester.

      Standard value

      Between 80°C and 100°C (167°F and 212°F) with warm engine.

      Result

      Result Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      Between 80°C and 100°C (176°F and 212°F) C

      HINT: 

      • If there is an open circuit, the tester indicates -40°C (-40°F).
      • If there is a short circuit, the tester indicates 140°C (284°F) or higher.

    C → See step   4 

    B → See step   7 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
    Fig 1: Identifying Engine Coolant Temperature Sensor Connector Terminals
    GTY162117Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the engine coolant temperature sensor connector.
    2. Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
    3. Connect the Techstream to the DLC3.
    4. Turn the ignition switch to ON.
    5. Turn the Techstream on.
    6. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
    7. Read the value displayed on the tester.

      Standard value

      140°C (284°F) or higher.

    8. Reconnect the engine coolant temperature sensor connector.

    NG → See step   3 

    OK → See step   5 

  3. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 
    Fig 2: Identifying Engine Coolant Temperature Sensor And ECM Connector Terminals
    GTY161086Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 Open)

      Tester Connection Condition Specified Condition
      C18-2 - C19-97 (THW) Always Below 1 Ω
      C18-1 - C19-96 (ETHW) Always Below 1 Ω
    4. Reconnect the engine coolant temperature sensor connector.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  4. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  5. CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL 
  6. CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM. Refer to  REMOVAL 
  7. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
    Fig 3: Checking For Short In Wire Harness
    GTY161827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the engine coolant temperature sensor connector.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
    6. Read the value displayed on the tester.

      Standard value

      -40°C (-40°F)

    7. Reconnect the engine coolant temperature sensor connector.

    NG → See step   8 

    OK → See step   9 

  8. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 
    Fig 4: Identifying Engine Coolant Temperature Sensor And ECM Connector Terminals
    GTY161087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
      C18-2 or C19-97 (THW) - Body ground Always 10 kΩ or higher
    4. Reconnect the engine coolant temperature sensor connector.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  9. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL 
  10. REPLACE ECM. Refer to  REMOVAL 
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