ECD SYSTEM (w/o DPF), Diagnostic DTC:P0115, P0117, 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 is built into the engine coolant temperature sensor and it changes its resistance value according to the engine coolant temperature.

The structure of the sensor and connection to the ECM is the same as the intake air temperature sensor.

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

(sensor resistance value less than 79 Ω)

(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

(sensor resistance value more than 156 kΩ)

(1 trip detection logic)

  • Open in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM

Tech Tips

When DTC P0115, P0117 and/or P0118 is detected, check the engine coolant temperature by selecting the following menu items on an intelligent tester: Powertrain / Engine / Data List / Coolant Temp.

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

WIRING DIAGRAM

A01BB6IE23

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips


  • If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

  • Read freeze frame data using an intelligent tester. Freeze frame data record 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.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect an intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester ON.

    3. Select the following menu items: Powertrain / Engine / Data List / Coolant Temp.

    4. Read the value.

      OK
      75 to 95°C (167 to 203°F) after warming up the engine.
      Result
      Temperature Displayed Proceed To
      -40°C (-40°F) A
      140°C (284°F) B
      OK (Same as actual engine coolant temperature) 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).


    B

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

    C

    CHECK FOR INTERMITTENT PROBLEMS

    A

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


    1. A01BABGE01

      Disconnect the D32 engine coolant temperature sensor connector.

    2. Connect terminals 1 and 2 of the engine coolant temperature sensor wire harness side connector.

    3. Connect an intelligent tester to the DLC3.

    4. Turn the ignition switch to ON and turn the tester ON.

    5. Select the following menu items: Powertrain / Engine / Data List / Coolant Temp.

    6. Read the value.

      Standard
      140°C (284°F)

    7. Reconnect the engine coolant temperature sensor connector.


    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

    NG

  3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)


    1. A01BAXIE41

      Disconnect the D32 engine coolant temperature sensor connector.

    2. Connect terminals THW and E2 of the D1 ECM connector.

      Tech Tips

      Before checking, perform a visual and contact pressure check on the ECM connector.

    3. Connect an intelligent tester to the DLC3.

    4. Turn the ignition switch to ON and turn the tester ON.

    5. Select the following menu items: Powertrain / Engine / Data List / Coolant Temp.

    6. Read the value.

      Standard
      140°C (284°F)

    7. Reconnect the engine coolant temperature sensor connector.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM

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


    1. A01BCZFE48

      Disconnect the D32 engine coolant temperature sensor connector.

    2. Connect an intelligent tester to the DLC3.

    3. Turn the ignition switch to ON and turn the tester ON.

    4. Select the following menu items: Powertrain / Engine / Data List / Coolant Temp.

    5. Read the value.

      Standard
      -40°C (-40°F)

    6. Reconnect the engine coolant temperature sensor connector.


    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

    NG

  5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)


    1. A01BF0TE30

      Disconnect the D32 engine coolant temperature sensor connector.

    2. Disconnect the D1 ECM connector.

    3. Connect an intelligent tester to the DLC3.

    4. Turn the ignition switch to ON and turn the tester ON.

    5. Select the following menu items: Powertrain / Engine / Data List / Coolant Temp.

    6. Read the value.

      Standard
      -40°C (-40°F)

    7. Reconnect the engine coolant temperature sensor connector.

    8. Reconnect the ECM connector.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE ECM