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СИСТЕМА SFI, Diagnostic DTC:P0115, P0117, P0118

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DTC Code DTC Name
P0115 Engine Coolant Temperature Circuit Malfunction
P0117 Engine Coolant Temperature Circuit Low Input
P0118 Engine Coolant Temperature Circuit High Input
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DESCRIPTION

A thermistor, whose resistance value varies according to the ECT, is built into the Engine Coolant Temperature (ECT) sensor.

The structure of the sensor and its connection to the ECM are the same as those of the Intake Air Temperature (IAT) sensor.

Tip:

When any of DTCs P0115, P0117 and P0118 is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECT is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC Code DTC Detection Condition Trouble Area
P0115 An open or short in the Engine Coolant Temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic).

  • Open or short in Engine Coolant Temperature (ECT) sensor circuit

  • ECT sensor

  • ECM
P0117 A short in the ECT sensor circuit for 0.5 seconds (1 trip detection logic).

  • Short in ECT sensor

  • ECT sensor

  • ECM
P0118 An open in the ECT sensor circuit for 0.5 seconds (1 trip detection logic).

  • Open in ECT sensor circuit

  • ECT sensor

  • ECM
Tip:

When any of these DTCs is output, check the ECT by entering the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

Temperature Displayed Malfunction
-40°C (-40°F) Open circuit
140°C (284°F) or higher Short circuit
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MONITOR DESCRIPTION

The Engine Coolant Temperature (ECT) sensor is used to monitor the ECT. The ECT sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the ECT. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the ECT sensor and stores DTC(s).

Example:

If the sensor output voltage is higher than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the ECT sensor circuit, and stores DTC P0118. Conversely, if the voltage output is below 0.14 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and stores DTC P0117.

If the malfunction is not repaired successfully, a DTC is stored 0.5 seconds after the engine is next started.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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PROCEDURE


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    READ VALUE USING GTS (ENGINE COOLANT TEMPERATURE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester 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 75 and 100°C (167 and 212°F) with warm engine.
      Table 1. Result
      Temperature Displayed Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      Between 75 and 100°C (176 and 212°F) C
      Tip:

      • 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.


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    READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)


    1. Disconnect the C18 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 GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the tester 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

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    CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    1. Disconnect the C18 ECT sensor connector.

    2. Disconnect the C45 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C18-2 - C45-76 (THW) Always Below 1 Ω
      C18-1 - C45-97 (ETHW) Always Below 1 Ω

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    READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)


    1. Disconnect the C18 ECT sensor connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the tester 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)

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    CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    1. Disconnect the C18 ECT sensor connector.

    2. Disconnect the C45 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C18-2 or C45-76 (THW) - Body ground Always 10 kΩ or higher

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    CHECK FOR INTERMITTENT PROBLEMSClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    GOOD CONNECTION TO ECM. IF OK, REPLACE ECMClick here

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

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    REPLACE ENGINE COOLANT TEMPERATURE SENSORClick here

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    REPLACE ECMClick here