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 Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Clear Memory Mode>OPERATION . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Inspection Mode>PROCEDURE .

CHECK ENGINE COOLANT.
Check the following items:
- Amount of engine coolant
- Engine coolant freeze
- Contamination of engine coolant
Is the engine coolant normal?
- Yes : Go to 2.
- No : Fill or replace the engine coolant. Ref. to COOLING(H4DOTC)>Engine Coolant>REPLACEMENT .
CHECK THERMOSTAT.
Does the thermostat remain opened?
- Yes : Replace the thermostat. Ref. to COOLING(H4DOTC)>Thermostat .
- No : Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Engine Coolant Temperature Sensor .