SFI SYSTEM (w/o EGR System), Diagnostic DTC:P0115, P0117, P0118

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

DESCRIPTION

A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor.

The structure of the sensor and its connection to the ECM are similar to those of the intake air temperature sensor.

Tech Tips

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

DTC No. DTC Detection Condition Trouble Area
P0115

Open or short in engine coolant temperature sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Open or short in engine coolant temperature sensor circuit


  • Engine coolant temperature sensor


  • ECM
P0117

Short in engine coolant temperature sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Short in engine coolant temperature sensor circuit


  • Engine coolant temperature sensor


  • ECM
P0118

Open in engine coolant temperature sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Open in engine coolant temperature sensor circuit


  • Engine coolant temperature sensor


  • ECM

Tech Tips

When any of these DTCs are set, check the engine coolant temperature by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

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

WIRING DIAGRAM

A01NG0RE40

INSPECTION PROCEDURE

Tech Tips


  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

  • If DTC P0117 is stored, check that the engine does not overheat (the DTC P0117 may be stored due to engine overheating).

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power 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
      Same as actual engine coolant temperature.
      Result
      Result Proceed to
      Displayed temperature is -40°C (-40°F) A
      Displayed temperature is 140°C (284°F) or more B
      Same as actual engine coolant temperature C

      Tech Tips


      • 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 more.


    B

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)


    1. Confirm good connection at the engine coolant temperature sensor connector.

      A01NGPVE07

    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 intelligent tester to the DLC3.

    5. Turn the power switch on (IG).

    6. Turn the tester on.

    7. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

    8. Read the value displayed on the tester.

      Standard
      140°C (284°F) or more
      Text in Illustration
      *1 Engine Coolant Temperature Sensor *2 ECM
      *3

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)

      		 - -

    9. Reconnect the engine coolant temperature sensor connector.


    NG

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

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

  3. 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 Open)
      Tester Connection Condition Specified Condition
      D11-2 - D1-90 (THW) Always Below 1 Ω
      D11-1 - D1-122 (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 (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

    OK

    REPLACE ECM Click here

  4. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)


    1. A01NEFFE12
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM

      Disconnect the engine coolant temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power 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
      -40°C (-40°F)

    7. Reconnect the engine coolant temperature sensor connector.


    NG

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

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

  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
      D11-2 or D1-90 (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 (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

    OK

    REPLACE ECM Click here