SFI SYSTEM, Diagnostic DTC:P26819C

DTC Code DTC Name
P26819C Engine Coolant Bypass Valve Low / Insufficient Flow

DESCRIPTION

Refer to DTC P268111.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P26819C Engine Coolant Bypass Valve Low / Insufficient Flow The actual increase in engine coolant temperature is less than calculated based on the intake air volume (2 trip detection logic).

  • Engine coolant level low

  • Air in cooling system (for Engine)

  • Engine coolant leak

  • Flow shutting valve (water valve)

  • Engine coolant temperature sensor

  • Engine water pump assembly

 Does not come on DTC stored SAE Code: P26A3

MONITOR DESCRIPTION

If the actual increase in engine coolant temperature is less than calculated based on the total intake air volume since the engine started, the ECM will judge that the flow shutting valve (water valve) is clogged and store this DTC.

CONFIRMATION DRIVING PATTERN

Tech Tips

Make sure to perform this procedure when the ambient temperature is 5°C (41°F) or more, the engine coolant temperature between 5 and 40°C (41 and 104°F), and the difference between the engine coolant temperature and ambient temperature is within 10°C (18°F).


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG).

  3. Turn the GTS on.

  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  5. Turn the power switch off and wait for at least 30 seconds.

  6. Turn the power switch on (IG).

  7. Turn the GTS on.

  8. Put the engine in Inspection Mode (Maintenance Mode).

    Click here

  9. Enter the following menus: Powertrain / Engine / Data List / Coolant Water Route Switching Valve.

  10. Start the engine with A/C switch and all other accessories off, release the accelerator pedal and check that the value of Data List item Engine Coolant Valve is "Closed".

  11. Idle the engine for 2 minutes or more.

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

  13. Read the 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.

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

  15. Input the DTC: P26819C.

  16. 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 is NORMAL, the system is normal.

    • If the judgment result is ABNORMAL, the system is malfunctioning.

    • If the judgment result is INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

CAUTION / NOTICE / HINT

Tech Tips


  • When replacing any cooling system (for Engine) parts, if excessive deposits of rust or scale exist or the concentration of the engine coolant is abnormal, replace the engine coolant.

    Click here

  • 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 P26819C)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P26819C is output A
      DTC P26819C and other DTCs are output B

      Tech Tips


      • If DTC P268172 and P26819C are output simultaneously, perform troubleshooting for DTC P26819C first.

      • If DTC P268173 and P26819C are output simultaneously, perform troubleshooting for DTC P268173 first.

        Click here

      • If any DTCs other than DTC P268172, P268173 or P26819C are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK RESERVE SEALED TANK WITHOUT CAP (ENGINE COOLANT LEVEL)


    1. Check that the engine coolant level is between the FULL and LOW lines.

      OK
      The engine coolant is not excessively low.

      Tech Tips

      Make sure that there are no signs of the engine overheating.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 6 Click here

    NG

  3. REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA


    1. Repair any engine coolant leaks.

      Tech Tips

      Add engine coolant and perform air bleeding after repair.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the power switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC P26819C)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

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

    3. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC P26819C is output B

    A

    END

    B

  6. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE ELECTRIC WATER PUMP)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Activate the Electric Water Pump.


      Powertrain > Engine > Active Test
      Tester Display
      Activate the Electric Water Pump

    5. Perform the Active Test according to the display on the GTS and lightly squeeze a radiator hose by hand to check for a pulsing feeling.

      OK
      Pulsing can be felt in a radiator hose.

      Tech Tips

      If pulsing cannot be felt in a radiator hose, inspect the engine water pump assembly. If the impeller is damaged, replace the engine water pump assembly.

      Result
      Proceed to
      OK
      NG

    NG

    INSPECT ENGINE WATER PUMP ASSEMBLY (VISUAL INSPECTION OF IMPELLER) Click here

    OK

  7. READ VALUE USING GTS (COOLANT TEMPERATURE AND HEATER COOLANT TEMPERATURE SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature and Heater Coolant Temperature Sensor.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temperature
      Heater Coolant Temperature Sensor

    5. Start the engine.

    6. Read the value displayed on the GTS.

      OK
      The values of Data List items Coolant Temperature and Heater Coolant Temperature Sensor change as the engine warms up and do not get stuck on a certain value.

      Tech Tips

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

      Click here

      Result
      Result Proceed to
      OK A
      NG (Value of Data List item Coolant Temperature does not change) B
      NG (Value of Data List item Heater Coolant Temperature does not change) C

    B

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    C

    REPLACE NO. 2 ENGINE COOLANT TEMPERATURE SENSOR Click here

    A

  8. REPLACE FLOW SHUTTING VALVE (WATER VALVE)


    1. Replace the flow shutting valve (water valve).

      Click here

      Tech Tips

      When replacing any cooling system (for Engine) parts, if excessive deposits of rust or scale exist or the concentration of the engine coolant is abnormal, replace the engine coolant.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the power switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK WHETHER DTC OUTPUT RECURS (DTC P26819C)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

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

    3. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      OK
      DTCs are not output.
      Result
      Proceed to
      NEXT

    NEXT

    END

  11. INSPECT ENGINE WATER PUMP ASSEMBLY (VISUAL INSPECTION OF IMPELLER)

    A001S12C02
    *1 Engine Water Pump Assembly
    *2 Impeller

    1. Visually inspect the impeller for damage.

      OK
      The impeller is not damaged.

      Tech Tips

      If the impeller is damaged, replace the engine water pump assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END