ECD SYSTEM, 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 changes its resistance value according to the ECT.

The structure of the sensor and connection to the ECM is the same as the Intake Air Temperature (IAT) sensor.

DTC No. Proceed to DTC Detection Condition Trouble Area
P0115 Step 1 Open or short in ECT sensor circuit for 0.5 seconds

  • Open or short in ECT sensor circuit

  • ECT sensor

  • ECM
P0117 Step 4 Short in ECT sensor circuit for 0.5 seconds

  • Open or short in ECT sensor circuit

  • ECT sensor

  • ECM
P0118 Step 2 Open in ECT sensor circuit for 0.5 seconds

  • Open or short in ECT sensor circuit

  • ECT 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 tester: Powertrain / Engine and ECT / Data List / Coolant Temp.

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

WIRING DIAGRAM

A01CGTHE09

INSPECTION PROCEDURE

Tech Tips


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

  • 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMPERATURE)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to the ON position.

    4. Turn the tester on.

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

      Standard
      Same value as the actual engine coolant temperature.
      Result
      Temperature Display Proceed to
      -40°C (-40°F) A
      140°C (284°F) or more B
      OK (same as air temperature near intake manifold) 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 more.


    B

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR 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. A01CGPZE01

      Disconnect the ECT sensor connector.

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

    3. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to the ON position.

    6. Turn the tester on.

    7. Enter the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

    8. Read the value.

      Standard
      140°C (284°F) or more

    9. Reconnect the ECT sensor connector.


    NG

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM) Click here

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

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


    1. A01CHT9E02

      Disconnect the ECT sensor connector.

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

      Tech Tips

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

    3. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to the ON position.

    6. Turn the tester on.

    7. Enter the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

    8. Read the value.

      Standard
      140°C (284°F) or more

    9. Reconnect the ECT sensor connector.


    NG

    REPLACE ECM

    OK

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

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


    1. A01CHI7E25

      Disconnect the ECT sensor connector.

    2. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn the tester on.

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

    7. Read the value.

      Standard
      -40°C (-40°F)

    8. Reconnect the ECT sensor connector.


    NG

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

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

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


    1. A01CH2EE02

      Disconnect the ECM connector.

    2. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn the tester on.

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

    7. Read the value.

      Standard
      -40°C (-40°F)

    8. Reconnect the ECT sensor connector.


    NG

    REPLACE ECM

    OK

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