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.

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode>OPERATION , and inspection mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Inspection Mode>PROCEDURE .

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 2

No: Fill or replace the engine coolant. Ref. to COOLING(H4DO)>Engine Coolant>REPLACEMENT
CHECK THERMOSTAT.
Check the thermostat.

Does the thermostat remain opened?

Yes: Replace the thermostat. Ref. to COOLING(H4DO)>THERMOSTAT

No: Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE COOLANT TEMPERATURE SENSOR