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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 40 (Engine Control System (2ZR-FXE) - Diagnostic Codes (12 Of 15)) >> SFI System >> DTC P148F-00: Engine Coolant Pump Over Revolution [04/2020 - 09/2022] >> Procedure

DTC P148F-00: Engine Coolant Pump Over Revolution [04/2020 - 09/2022]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P148F-00) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P148F-00 is output A
      DTC P148F-00 and other DTCs are output B

      HINT: 

      If any DTCs other than P148F-00 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2020 - 09/2022] 

    Result: 

    A 

    See step  2

  2. CHECK RESERVE SEALED TANK WITHOUT CAP (ENGINE COOLANT LEVEL) 
    1. Check that the engine coolant level is between the FULL and LOW lines.

      Result

      Result Proceed to
      Engine coolant level is below the LOW line A
      Engine coolant level is above the LOW line B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  3

  3. CHECK FOR ENGINE COOLANT LEAKS 
    1. Check the areas around the engine and heater for engine coolant leaks.

      HINT: 

      If the engine oil is cloudy during the engine oil level gauge check, it means that engine coolant has entered the engine lubrication system.

      OK

      No leaks.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. ADD ENGINE COOLANT 
    1. Fill the reservoir tank up to the FULL line with engine coolant.
      NOTE:

      Make sure not to add engine coolant when the engine is hot.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  5. REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 
    1. Repair any engine coolant leaks.

      HINT: 

      Add engine coolant and perform air bleeding after repair.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream 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

    Result: 

    NEXT 

    See step  7

  7. INSPECT ENGINE WATER PUMP ASSEMBLY 

    HINT: 

    Perform this inspection indoors.

    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in Inspection Mode (Maintenance Mode).

      Refer to INSPECTION MODE PROCEDURE [06/2018 - ]

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    5. Start the engine.
    6. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature and Electric Water Pump Speed.

      HINT: 

      Display the Data List items on the graph view.

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
      Electric Water Pump Speed
    7. Idle the engine for about 20 minutes and check Coolant Temperature, Electric Water Pump Speed using the Techstream, and check the cooling fans.

      Result

      Result Proceed to
      Either of the following conditions is met:
      • The engine coolant temperature becomes 95°C (203°F) or higher and the engine water pump assembly performs intermittent operation (5 seconds pause after 25 seconds operation).
      • The engine water pump assembly does not start operating even after the engine coolant temperature becomes 95°C (203°F) or higher.*1, *2
      		 A
      The cooling fans start operating after the engine coolant temperature becomes 95°C (203°F) or less and a decrease in the engine coolant temperature is observed.*3 B

      HINT: 

      • *1: Be careful when the cooling fans do not start operating even after the engine coolant temperature becomes 95°C (203°F) or higher because the engine coolant temperature increases rapidly. (Make sure to stop the engine if the engine coolant temperature becomes 105°C (221°F) or higher.)
      • *2: If the ECM voltage is 14 V or higher and the engine water pump assembly is operated excessively due to insufficient coolant etc., the Electric Water Pump Speed will exceed 5300 rpm. Enter the following menus to check the voltage of the ECM: Powertrain / Engine / Data List / Battery Voltage.
      • *3: When the engine is warmed up, the cooling fans operate and the engine coolant temperature will decrease. After the cooling fans begin operating, the engine coolant temperature will stabilize between 88 to 95°C (190 to 203°F).

    Result: 

    B 

    END 

    Result: 

    A 

    See step  8

  8. REPLACE ENGINE WATER PUMP ASSEMBLY 
    1. Replace the engine water pump assembly.

      Refer to REMOVAL [04/2020 - 09/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. ADD ENGINE COOLANT 
    1. Fill the reservoir tank up to the FULL line with engine coolant.
      NOTE:

      Make sure not to add engine coolant when the engine is hot.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream 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

    Result: 

    NEXT 

    See step  11

  11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 

    HINT: 

    Perform this inspection indoors.

    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in Inspection Mode (Maintenance Mode).

      Refer to INSPECTION MODE PROCEDURE [06/2018 - ]

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    5. Start the engine.
    6. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature and Electric Water Pump Speed.

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
      Electric Water Pump Speed
    7. Idle the engine for about 20 minutes and check Coolant Temperature, Electric Water Pump Speed using the Techstream, and check the cooling fans.

      OK

      The cooling fans start operating after the engine coolant temperature becomes 95°C (203°F) or less and a decrease in the engine coolant temperature is observed.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

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