DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

Engine does not return to idle.

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC other than P0125 displayed? (Current code)

   Yes:  Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No:  Go to  2.

2. CHECK ENGINE COOLANT  .

   Check the following items:

   • Amount of engine coolant
   • Engine coolant freeze
   • Contamination of engine coolant

   Is the check result OK?

   Yes:  Go to  3.

   No:  Fill or replace the engine coolant. Ref. to COOLING (H4DOTC)>ENGINE COOLANT>REPLACEMENT .

3. CHECK THERMOSTAT  .

   Check the engine side thermostat. Ref. to COOLING (H4DOTC)>THERMOSTAT>INSPECTION .

   Does the thermostat remain opened?

   Yes:  Replace the engine side thermostat. Ref. to COOLING (H4DOTC)>THERMOSTAT .

   No:  Go to  4.

4. CHECK ENGINE COOLANT TEMPERATURE SENSOR  .

   Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE COOLANT TEMPERATURE SENSOR>INSPECTION .

   Is the check result OK?

   Yes:  Go to  5.

   No:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE COOLANT TEMPERATURE SENSOR .

5. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
   3. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC for [Engine] displayed?

   Yes:  Check the connection of connector. If there is no faulty connector, perform the diagnosis for the displayed DTCs. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   NOTE: After the concerned inspection step is performed, the final check in Basic Diagnostic Procedure is not necessary.

   No:  Finish the diagnosis.

   NOTE: After the concerned inspection step is performed, the final check in Basic Diagnostic Procedure is not necessary.