SFI SYSTEM, Diagnostic DTC:P0125

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

DESCRIPTION

Refer to DTC P0117 Click here.

DTC No. DTC Detection Condition Trouble Area
P0125

Engine coolant temperature is less than 20°C (68 °F) for 398.5 to 766.4 seconds or more (varies with engine coolant temperature or intake air temperature at engine start).

(2 trip detection logic)

  • Cooling system

  • Engine coolant temperature sensor

  • Thermostat

MONITOR DESCRIPTION

The diagnostic system monitors for a functional check of the engine coolant temperature sensor. If the engine coolant temperature does not reach the temperature to enable the closed loop air/fuel ratio control within a predetermined time after engine start, the diagnostic system determines a malfunction of engine coolant temperature sensor and stores the DTC.

CONFIRMATION DRIVING PATTERN

A004KP7E03

  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) Click here.

  4. Turn the ignition switch off and wait for at least 30 seconds.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

    Tech Tips

    Check the engine coolant temperature is 20°C (68°F) or less at engine started.

  7. Perform the following the confirmation driving pattern.

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.


    1. Drive the vehicle at 80 km/h (50 mph) or more for 20 minutes or more [A].

    2. Stop the vehicle.

    3. Idle the engine for 1 minute or more [B].

  8. Enter the following menus: Powertrain / Engine / Trouble Codes.

  9. Read pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  11. Input the DTC: P0125.

  12. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

  13. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


    • If a permanent DTC is output, the system is malfunctioning.

    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0117 Click here.

CAUTION / NOTICE / HINT

Tech Tips


  • If any of DTCs P0116, P0117 or P0118 are 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 GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    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 THERMOSTAT


    1. Inspect the thermostat Click here.


    NG

    REPLACE THERMOSTAT 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.


    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

    REPAIR OR REPLACE COOLING SYSTEM