Code 0103

DTC 0103 Engine Coolant Temperature Sensor (ECTS) (Circuit)









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.





Reference data









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.

With GST
1. Turn ignition switch "ON" and wait at least 5 seconds.
2. Select "MODE 7" with GST.

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.

Steps 1 - 6:

Diagnostic Procedure




Wiring Diagram




Connectors

Component Inspection









Check resistance as shown in the figure.





Reference data
If NG, replace engine coolant temperature sensor.