DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)
READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)
CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
REPLACE ECM
CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR
REPAIR OR REPLACE HARNESS OR CONNECTOR
CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
DTC P0115 Engine Coolant Temperature Circuit
DTC P0117 Engine Coolant Temperature Circuit Low Input
DTC 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.
- If DTC P0115, P0117 or P0118 is stored, the ECM operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).
P0115| DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
| Ignition switch ON for 0.5 seconds | Open or short in the engine coolant temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic). | Open or short in engine coolant temperature (ECT) sensor circuit
ECT sensor
ECM
|
P0117| DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
| Ignition switch ON for 0.5 seconds | Short in the ECT sensor circuit for 0.5 seconds (1 trip detection logic). | Short in ECT sensor circuit
ECT sensor
ECM
|
P0118| DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
| Ignition switch ON for 0.5 seconds | Open in the ECT sensor circuit for 0.5 seconds (1 trip detection logic). | Open in ECT sensor circuit
ECT sensor
ECM
|
Related Data List| DTC No. | Data List |
| P0115 | Coolant Temp |
| P0117 |
| P0118 |
If DTC P0115, P0117and/or P0118 is stored, the following symptoms may appear:
Misfire
Combustion noise
Black smoke
White smoke
Lack of power
When DTC P0115, P0117 and/or P0118 is stored, check the engine coolant temperature by entering the following menus: Powertrain / Engine / Data List / Coolant Temp.
Reference:| Temperature Displayed | Malfunction |
| -40°C (-40°F) | Open circuit |
| 140°C (284°F) or higher | Short circuit |
WIRING DIAGRAM
INSPECTION PROCEDURE
- After replacing the ECM, the new ECM needs registration () and initialization ().
If DTCs relating to different systems are stored, and they share terminal E2 as their ground, check this ground circuit first.
Read freeze frame data using the intelligent tester. Freeze frame data records 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, and other data from the time the malfunction occurred.
| 1.READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
Read the value.
- OK:
- 75 to 90°C (167 to 194°F) with warm engine.
Result| Result | Proceed to |
| -40°C (-40°F) | A |
| 140°C (284°F) or higher | B |
| 75 to 90°C (167 to 194°F) | C |
If there is an open circuit, the tester indicates -40°C (-40°F).
If there is a short circuit, the tester indicates 140°C (284°F) or more.
| 2.READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS) |
Disconnect the engine coolant temperature (ECT) sensor connector.
Connect terminals 1 and 2 of the ECT sensor wire harness side connector.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
Read the value.
- OK:
- 140°C (284°F) or higher
| 3.CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) |
Disconnect the ECT sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Short):
for LHD| Tester Connection | Condition | Specified Condition |
| C71-2 - C45-76 (THW) | Always | Below 1 Ω |
| C71-1 - C45-75 (E2) | Always | Below 1 Ω |
for RHD| Tester Connection | Condition | Specified Condition |
| C71-2 - C46-76 (THW) | Always | Below 1 Ω |
| C71-1 - C46-75 (E2) | Always | Below 1 Ω |
| 4.READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) |
Disconnect the ECT sensor connector.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
| 5.CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) |
Disconnect the ECT sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Short):
for LHD| Tester Connection | Condition | Specified Condition |
| C71-2 or C45-76 (THW) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| C71-2 or C46-76 (THW) - Body ground | Always | 10 kΩ or higher |
| 7.CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR |
Replace the engine coolant temperature sensor ().
| 8.REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 9.CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM |
| 10.REPLACE ENGINE COOLANT TEMPERATURE SENSOR |
Replace the engine coolant temperature sensor ().
| 11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Connect the intelligent tester to the DLC3.
Turn the ignition switch off.
Turn the ignition switch to ON for 1 second.
Enter the following menus: Powertrain / Engine / DTC.
Confirm that the DTC is not output again.
