P0125
Reference Data:
COMPONENT DESCRIPTION
The engine coolant temperature sensor is located near the No. 2 injector. The 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.
CAUTION: Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals such as the body ground.
On Board Diagnosis Logic:
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
CAUTION: Do not overheat engine.
NOTE:
- If DTC P0115 (0103) is displayed with P0125 (0908), first perform TROUBLE DIAGNOSIS FOR DTC P0115.
- If "DIAGNOSTIC TROUBLE CODE 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 "COOLAN TEMP/S" in "DATA MONITOR" mode with CONSULT-II.
3. Check that "COOLAN TEMP/S" is above 10 °C (50 °F). If it is above 10 °C (50 °F), the test result will be OK. If it is below 10 °C (50 °F), go to following step.
4. Start engine and run it for 65 minutes at idle speed.
If "COOLAN TEMP/S" increases to more than 10 °C (50 °F) within 65 minutes, stop engine because the test result will be OK.
5. If 1st DTC is detected, go to "DIAGNOSTIC PROCEDURE".
OR
With Generic Scan Tool
Follow the procedure "With CONSULT-II" above.
EC-ECTS-01:
EC-ECTS-01 Connector View:
WIRING DIAGRAM
Super Multiple Junction (SMJ) Terminal Arrangement (B3, D1, D21, E66, M4, M6, M11, M12, M45, N1):
Super Multiple Junction (SMJ) Terminal Arrangement (B4, B101, E70, E81, F63, M3, M49, M50):
DIAGNOSTIC PROCEDURE
COMPONENT INSPECTION
Engine coolant temperature sensor
Check resistance as shown in the figure.
If NG, replace engine coolant temperature sensor.