P0125
NOTE: If DTC P0125 is displayed with P0115, first perform the trouble diagnosis for DTC 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
Malfunction is detected when voltage sent to ECM from the sensor is not practical, even when some time has passed after starting the engine, or engine coolant temperature is insufficient for closed loop fuel control.
Possible Cause
- Harness or connectors
(High resistance in the circuit)
- Engine coolant temperature sensor
- Thermostat
DTC Confirmation Procedure
CAUTION: Be careful not to overheat engine.
NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch "ON".
2. Select "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 trip DTC is detected, go to "Diagnostic Procedure" below.
WITH GST
Follow the procedure "WITH CONSULT-II" above.
EC-ECTS-01:
EC-ECTS-01 - Connector View:
Wiring Diagram
Diagnostic Procedure
Diagnostic Procedure Step 1:
Diagnostic Procedure Step 2:
Diagnostic Procedure Step 3:
Diagnostic Procedure Step 4:
Diagnostic Procedure Step 5:
