SFI SYSTEM (w/ EGR System), Diagnostic DTC:P0125

DTC Code DTC Name
P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control

DESCRIPTION

Refer to DTC P0115 Click here.

DTC No. DTC Detection Condition Trouble Area
P0125

Engine coolant temperature does not reach closed-loop enabling temperature for 20 minutes (this period varies with engine start engine coolant temperature)

(2 trip detection logic)

  • Cooling system

  • Engine coolant temperature sensor

  • Water inlet with thermostat sub-assembly

WIRING DIAGRAM

Refer to DTC P0115 Click here.

INSPECTION PROCEDURE

Tech Tips


  • If any of DTCs P0115, P0116, P0117 or P0118 is set simultaneously with DTC P0125, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0125 is output A
      DTC P0125 and other DTCs are output B

      Tech Tips

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


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY


    1. Remove the water inlet with thermostat sub-assembly Click here.

    2. Check the valve opening temperature of the water inlet with thermostat sub-assembly.

      Standard value
      80 to 84°C (176 to 183°F)

      Tech Tips

      In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

    3. Reinstall the water inlet with thermostat sub-assembly Click here.


    NG

    REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY Click here

    OK

  3. CHECK COOLING SYSTEM


    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 Click here