DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control: Procedure

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the tester on.
4. Enter the following menus: Powertrain / Engine / Trouble Codes.
5. Read DTCs.

   Result

   Display (DTC Output)	Proceed to
   P0125	A
   P0125 and other DTCs	B

   HINT: 

   If any DTCs other than P0125 are output, troubleshoot those DTCs first.

B → GO TO DTC CHART 

A: Go to next step 

1. Inspect the thermostat. Refer to INSPECTION .

NG → REPLACE THERMOSTAT 

OK: Go to next step 

1. Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications.

NG → REPAIR OR REPLACE COOLING SYSTEM 

OK → REPLACE ENGINE COOLANT TEMPERATURE SENSOR