СИСТЕМА SFI, 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 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.

Tech Tips

When DTC P0115, P0117 or 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 No. DTC Detection Condition Trouble Area
P0115 An open or short in the ECT sensor circuit for 0.5 seconds (1 trip detection logic).

  • Open or short in 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 circuit

  • 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

Tech Tips

When any of these DTCs are stored, check the ECT using the intelligent tester. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

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

WIRING DIAGRAM

A00DRLQE02

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. 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, and other data from the time the malfunction occurred.

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

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

    4. Read the value displayed on the tester.

      Standard value
      Between 80°C and 100°C (176°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

      Tech Tips

      • If there is an open circuit, the intelligent tester indicates -40°C (-40°F).

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

    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. Disconnect the B3 Engine Coolant Temperature (ECT) sensor connector.

      A00DSBVE89

    2. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG) and turn the tester on.

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

    6. Read the value displayed on the tester.

      Standard value
      140°C (284°F) or higher.
      Text in Illustration
      *1 ECT Sensor
      *2 ECM
      *3

      Front view of wire harness connector

      (to ECT Sensor)

    7. Reconnect the ECT sensor connector.

    NG

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

    OK

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

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

    1. Disconnect the B3 ECT sensor connector.

      A00DSH8E45

    2. Disconnect the B39 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B3-2 - B39-97 (THW) Always Below 1 Ω
      B3-1 - B39-96 (ETHW)
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECT Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the ECT sensor connector.

    5. Reconnect the ECM connector.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM Click here

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

    1. Disconnect the B3 ECT sensor connector.

      A00DSB0E04

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and turn the tester on.

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

    5. Read the value displayed on the tester.

      Standard value
      -40°C (-40°F)
      Text in Illustration
      *1 ECT Sensor
      *2 ECM

    6. Reconnect the ECT 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 B3 ECT sensor connector.

      A00DSH8E46

    2. Disconnect the B39 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B3-2 or B39-97 (THW) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECT Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the ECT sensor connector.

    5. Reconnect the ECM connector.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here