SFI SYSTEM, Diagnostic DTC:P0115,P0117 and P0118

DTC Code DTC Name
P0115 Engine Coolant Temperature Circuit
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 the same as those of the intake air temperature sensor.

Tip:

When DTC P0115, P0117 or P0118 is stored, 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

An open or short in the 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

A short in the 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

An open in the 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
Tip:

When any of these DTCs are output, check the engine coolant temperature by entering the following menus on the GTS: 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

A162760E85

CAUTION / NOTICE / HINT

Tip:

Read freeze frame data using the GTS. 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.

PROCEDURE

  1. READ VALUE USING GTS (ENGINE COOLANT TEMPERATURE)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

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

    4. Read the value displayed on the GTS.

      Standard

      Between 80°C and 100°C (176°F and 212°F) with warm engine.

      Table 1. Result

      Result

      Proceed to

      Temperature displayed is -40°C (-40°F)

      A

      Temperature displayed is 140°C (284°F) or higher

      B

      Temperature displayed is between 80°C and 100°C (176°F and 212°F)

      C
      Tip:

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

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

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

    CHECK FOR INTERMITTENT PROBLEMS

    (Click here)

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

    1. U121756E02

      Confirm a good connection at the engine coolant temperature sensor.

    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 GTS to the DLC3.

    5. Turn the ignition switch to ON and turn the GTS on.

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

    7. Read the value displayed on the GTS.

      Standard

      140°C (284°F) or higher.

      Tip:

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (Click here).

      Table 2. Text in Illustration

      *1

      Engine Coolant Temperature Sensor

      *2

      ECM

      *a

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)

    8. Reconnect the engine coolant temperature sensor connector.

    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

      C5-2 - C111-120 (THW)

      Always

      Below 1 Ω

      C5-1 - C111-119 (ETHW)

      Always

      Below 1 Ω

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.

    REPLACE ECM

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

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

    1. A211723E17

      Disconnect the engine coolant temperature sensor connector.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON and turn the GTS on.

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

    5. Read the value displayed on the GTS.

      Standard

      -40°C (-40°F)

      Tip:

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (Click here).

      Table 3. Text in Illustration

      *1

      Engine Coolant Temperature Sensor

      *2

      ECM

    6. Reconnect the engine coolant temperature sensor connector.

    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

      C5-2 or C111-120 (THW) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.

    REPLACE ECM

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)