ECD SYSTEM (w/ EGR Cooler Bypass Valve), 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 (ECT) 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.

Tech Tips

If the ECM detects the DTC P0115, P0117, or P0118, it operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).

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 entering the following menus on the intelligent tester: 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

A01KF6VE10

INSPECTION PROCEDURE

Tech Tips


  • If other DTCs relating 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 running or stopped, 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.

Note

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

PROCEDURE


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


    1. Connect an intelligent tester to the DLC3.

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

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

    4. Read values displayed on the tester.

      Standard
      75°C to 95°C (167°F to 203°F) with warm engine
      Result
      Temperature Displayed Proceed To
      -40°C (-40°F) A
      140°C (284°F) or higher B
      80°C to 100°C (176°F to 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. A01KI31E02
      Text in Illustration
      *1 ECT Sensor
      *2 ECM
      *3 ECT Sensor Connector
      *a Wire Harness Side

      Disconnect the W2 engine coolant temperature (ECT) sensor connector.

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

    3. Connect an intelligent tester to the DLC3.

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

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

    6. Read the value displayed on the tester.

      Standard
      140°C (284°F) or higher

    7. Reconnect the ECT sensor connector.


    OK

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

    NG

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


    1. A01KHK2E02
      Text in Illustration
      *1 ECT Sensor
      *2 ECM

      Disconnect the W2 ECT sensor connector.

    2. Connect terminals THW and E2 of the E12 and E13 ECM connectors.

      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 menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    6. Read values displayed on the tester.

      Standard
      140°C (284°F) or higher

    7. Reconnect the ECT sensor connector.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

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

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


    1. A01KFX7E02
      Text in Illustration
      *1 ECT Sensor
      *2 ECM
      *3 ECT Sensor Connector
      *a Wire Harness Side

      Disconnect the W2 ECT 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 menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    5. Read values displayed on the tester.

      Standard
      -40°C (-40°F)

    6. Reconnect the ECT sensor connector.


    OK

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

    NG

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


    1. A01KGCME02
      Text in Illustration
      *1 ECT Sensor
      *2 ECM
      *3 ECM Connector

      Disconnect the W2 ECT sensor connector.

    2. Disconnect the E12 and E13 ECM connectors.

    3. Connect an intelligent tester to the DLC3.

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

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

    6. Read values displayed on the tester.

      Standard
      -40°C (-40°F)

    7. Reconnect the ECT sensor connector.

    8. Reconnect the ECM connectors.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE ECM Click here