P0115

Reference Data:

Component Description
The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.







On Board Diagnosis Logic

DTC Confirmation Procedure

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

With CONSULT
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT.




3. Wait at least 5 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure".

With GST
1. Turn ignition switch "ON" and wait at least 5 seconds.
2. Select "MODE 7" with GST.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure".

No Tools
1. Turn ignition switch "ON" and wait at least 5 seconds.
2. Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
3. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure".

EC-ECTS-01:

EC-ECTS-01 Connector View:

Wiring Diagram

M119, M120:

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Diagnostic Procedure







Component Inspection
Check resistance as shown in the figure.


Temperature °C (°F): Resistance kOhms
20 (68): 2.1 - 2.9
50 (122): 0.68 - 1.00
90 (194): 0.236 - 0.260
If NG, replace engine coolant temperature sensor.