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Home >> Lexus >> 2009 >> LX 570 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control (Diagnostic Codes (P0010-P0451) >> 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 OUTPUT DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream on.
    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    4. Read DTCs.
      RESULT

      Result Proceed to
      P0115 is output A
      P0117 is output B
      P0118 is output C

    C → See step   3 

    B → See step   8 

    A: Go to next step 

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

      Standard value

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

      RESULT

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

    C → See step   5 

    B → See step   8 

    A: Go to next step 

  3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
    Fig 1: Identifying Terminals Of C15 Engine Coolant Temperature Sensor Connector
    GTY145499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C15 Engine Coolant Temperature (ECT) sensor connector.
    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 and ECT / Data List / All Data / Coolant Temp.
    7. Read the value displayed on the Techstream.

      Standard value

      140°C (284°F) or higher

    NG → See step   4 

    OK → See step   6 

  4. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 
    Fig 2: Identifying Terminals Of C15 ECT Sensor And C53 ECM Connectors
    GTY147721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C15 ECT sensor connector.
    2. Disconnect the C53 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C15-2 - C53-76 (THW) Always Below 1 Ω
      C15-1 - C53-98 (ETHA) Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  5. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  6. CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL 
  7. GOOD CONNECTION TO ECM. IF OK, REPLACE ECM. Refer to  REMOVAL 
  8. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
    Fig 3: Identifying Terminals Of C15 ECT Sensor Connector
    GTY147990Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C15 ECT sensor connector.
    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 / All Data / Coolant Temp.
    6. Read the value displayed on the Techstream.

      Standard value

      -40°C (-40°F)

    NG → See step   9 

    OK → See step   10 

  9. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) 
    Fig 4: Identifying Terminals Of C15 ECT Sensor And C53 ECM Connectors
    GTY147722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C15 ECT sensor connector.
    2. Disconnect the C53 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C15-2 or C53-76 (THW) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   11 

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