Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001NMQI
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 - 09/2022]
Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P148F00; Engine Coolant Pump Over Revolution; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

DTC

P148F00

Engine Coolant Pump Over Revolution

DESCRIPTION

The ECM controls the engine water pump assembly by calculating the necessary amount of coolant flow based on engine coolant temperature, engine speed and vehicle speed information. The speed of the engine water pump assembly is controlled steplessly using a duty cycle signal sent from the ECM. This optimal control enhances warm-up performance and reduces cooling losses, thus reducing the specific fuel consumption of the engine.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P148F00

Engine Coolant Pump Over Revolution

When both of the following conditions are met for 5 seconds or more (1 trip detection logic):

  • Engine water pump assembly duty cycle is 85% or higher.
  • Actual engine water pump assembly speed exceeds the target for a certain amount of time.
  • Lack of engine coolant
  • Engine coolant leak
  • Engine water pump assembly

Does not come on

DTC stored

  • SAE Code: P148F
  • DTC for Mexico Models: Applies

MONITOR DESCRIPTION

The ECM monitors the speed of the engine water pump assembly and stores a DTC when it determines that the engine water pump assembly rotates excessively based on the fact that the actual speed is higher than the target for a certain amount of time. (However, the MIL will not illuminate.)

CAUTION / NOTICE / HINT

NOTICE:

  • Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

    - for Nickel Metal Hydride Battery: Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY

    - for Lithium-ion Battery: Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): VEHICLE CONTROL HISTORY

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    - for Nickel Metal Hydride Battery: Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY

    - for Lithium-ion Battery: Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): VEHICLE CONTROL HISTORY

HINT:

  • DTC P148F00 may be stored if the engine has continuously run with insufficient engine coolant. If the engine coolant is sufficient and DTC P148F00 recur when the vehicle is brought to the workshop, confirm whether engine coolant was added after the vehicle had been driven with insufficient engine coolant.
  • Read freeze frame data using the Techstream. 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 P148F00)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P148F00 is output

A

DTC P148F00 and other DTCs are output

B

HINT:

If any DTCs other than P148F00 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

CHECK RESERVE SEALED TANK WITHOUT CAP (ENGINE COOLANT LEVEL)

(a) Check that the engine coolant level is between the FULL and LOW lines.

Result

Proceed to

Engine coolant level is below the LOW line

A

Engine coolant level is above the LOW line

B

B

GO TO STEP 6

A

3.

CHECK FOR ENGINE COOLANT LEAKS

(a) 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.

NG

GO TO STEP 5

OK

4.

ADD ENGINE COOLANT

(a) Fill the reservoir tank up to the FULL line with engine coolant.

NOTICE:

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

NEXT

GO TO STEP 6

5.

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

(a) Repair any engine coolant leaks.

HINT:

Add engine coolant and perform air bleeding after repair.

NEXT

6.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the power switch off and wait for at least 30 seconds.

NEXT

7.

INSPECT ENGINE WATER PUMP ASSEMBLY

HINT:

Perform this inspection indoors.

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

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

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(e) Start the engine.

(f) 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

(g) Idle the engine for about 20 minutes and check Coolant Temperature, Electric Water Pump Speed using the Techstream, and check the cooling fans.

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).
B

END

A

8.

REPLACE ENGINE WATER PUMP ASSEMBLY

(a) Replace the engine water pump assembly.

Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; 2ZR-FXE (COOLING): WATER PUMP: REMOVAL

NEXT

9.

ADD ENGINE COOLANT

(a) Fill the reservoir tank up to the FULL line with engine coolant.

NOTICE:

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

NEXT

10.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the power switch off and wait for at least 30 seconds.

NEXT

11.

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

HINT:

Perform this inspection indoors.

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

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

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(e) Start the engine.

(f) 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

(g) 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.

NEXT

END