GSIC - Global Service Information Center

### DTC P0115/22 Engine Coolant Temperature Circuit

### DTC P0117/22 Engine Coolant Temperature Circuit Low Input

### DTC P0118/22 Engine Coolant Temperature Circuit High Input

## for Preparation Click here

## DESCRIPTION

A thermistor is built in the Engine Coolant Temperature (ECT) sensor and changes the resistance value according to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as the inlet air temperature sensor.

HINT:

  If the ECM detects the DTC P0115/22, P0117/22 or P0118/22, 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

P0115/22

Open or short in ECT sensor circuit for 0.5 seconds
(1 trip detection logic)

1. Open or short in ECT sensor circuit
2. ECT sensor
3. ECM

P0117/22 | Short in ECT sensor circuit for 0.5 seconds (sensor resistance value less than 79 Ω)
P0118/22 | Open in ECT sensor circuit for 0.5 seconds (sensor resistance value more than 156 kΩ) (1 trip detection logic)

HINT:

  When DTC P0115/22, P0117/22 and/or P0118/22 is detected, check the engine coolant temperature by entering on the intelligent tester: Powertrain / Engine / Data List / Coolant Temp.

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

## WIRING DIAGRAM

## INSPECTION PROCEDURE

HINT:

1. If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

NOTICE:

  If the ECM is replaced, the new ECM needs initialization (Click here).

## When using intelligent tester:

1.READ DATA LIST (ENGINE COOLANT TEMPERATURE)

1. Connect the intelligent tester to the DLC3.

1. Turn the ignition switch ON and turn the intelligent tester ON.

1. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

1. Read the values.

   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) or more | B
     OK (Same as actual engine coolant temperature) | C

   HINT:
   1. If there is an open circuit, the intelligent tester indicates -40°C (-40°F).
   2. If there is a short circuit, the intelligent tester indicates 140°C (284°F) or more.

| B |

Go to step 4

| C |

CHECK FOR INTERMITTENT PROBLEMS

A |

2.READ DATA LIST (CHECK FOR OPEN IN WIRE HARNESS)

1. Disconnect the W1 ECT sensor connector.

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

1. Connect the intelligent tester to the DLC3.

1. Turn the ignition switch ON and turn the intelligent tester ON.

1. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

1. Read the values.

   Standard:
     140°C (284°F) or more

| OK |

CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG |

3.READ DATA LIST (CHECK FOR OPEN IN ECM)

1. Disconnect the W1 ECT sensor connector.

1. Connect terminals THW and E2 of the E8 ECM connector.

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

1. Connect the intelligent tester to the DLC3.

1. Turn the ignition switch ON and turn the intelligent tester ON.

1. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

1. Read the values.

   Standard:
     140°C (284°F) or more

| OK |

REPAIR OR REPLACE HARNESS AND CONNECTOR

NG |

CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM

4.READ DATA LIST (CHECK FOR SHORT IN WIRE HARNESS)

1. Disconnect the W1 ECT sensor connector.

1. Connect the intelligent tester to the DLC3.

1. Turn the ignition switch ON and turn the intelligent tester ON.

1. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

1. Read the values.

   Standard:
     -40°C (-40°F)

| OK |

CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG |

5.READ DATA LIST (CHECK FOR SHORT IN ECM)

1. Disconnect the W1 ECT sensor connector.

1. Disconnect the E8 ECM connector.

1. Connect the intelligent tester to the DLC3.

1. Turn the ignition switch ON and turn the intelligent tester ON.

1. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

1. Read the values.

   Standard:
     -40°C (-40°F)

| OK |

REPAIR OR REPLACE HARNESS AND CONNECTOR

NG |

REPLACE ECM

## When not using intelligent tester:

1.CHECK ECM (THW VOLTAGE)

1. Start the engine.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Condition | Specified Condition
     E8-19 (THW) - E8-28 (E2) | Idling, Engine coolant temperature between 60 and 120°C (140 and 248°F) | 0.2 to 1.0 V

| OK |

CHECK FOR INTERMITTENT PROBLEMS

NG |

2.INSPECT ENGINE COOLANT TEMPERATURE SENSOR

1. Remove the sensor.

1. Measure the resistance of the sensor.

   Standard resistance:

     Tester Connection | Condition | Specified Condition
     1 - 2 | 20°C (68°F) | 2.32 to 2.59 kΩ
     1 - 2 | 80°C (176°F) | 0.310 to 0.326 kΩ

   NOTICE:
     When checking the ECT sensor in water, keep the terminals dry. After the check, wipe the sensor dry.

   HINT:
     Alternative procedure: Connect an ohmmeter to the installed ECT sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values against the resistance/temperature graph. Change the engine temperature (warm up or allow to cool down) and repeat the test.

| NG |

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

OK |

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

1. Disconnect the E8 ECM connector.

1. Disconnect the W1 sensor connector.

1. Measure the resistance of the wire harness side connectors.

   Standard resistance:

     Tester Connection | Specified Condition
     E8-19 (THW) - W1-2 (THW) | Below 1 Ω
     E8-28 (E2) - W1-1 (E2) | Below 1 Ω
     E8-19 (THW) or W1-2 (THW) - Body ground | 10 kΩ or higher
     E8-28 (E2) or W1-1 (E2) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

REPLACE ECM