Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000025XY7
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: 2ZR-FXE (ENGINE CONTROL): MASS AIR FLOW METER: ON-VEHICLE INSPECTION; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

HINT:

Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

(a) Read the value of Data List item "Mass Air Flow Sensor" using the Techstream.

NOTICE:

Perform the inspection of the mass air flow meter sub-assembly while it is installed to the air cleaner cap sub-assembly (installed to the vehicle).

(1) Check and ensure the following conditions:

  1. Turn off all electrical loads, such as the air conditioning, etc.
  2. Check that the coolant temperature is 75°C (167°F) or more.
  3. Put the shift lever in the N position.

(2) Connect the Techstream to the DLC3.

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

(4) Turn the Techstream on.

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

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(6) Start the engine.

(7) Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.

Powertrain > Engine > Data List

Tester Display

Mass Air Flow Sensor

(8) According to the display on the Techstream, read the Data List when the engine is running.

Standard Condition:

Techstream Display

Condition

Specified Condition

Mass Air Flow Sensor

Idling with warmed up engine (inspection mode [maintenance mode], not charge control)

1.0 to 3.0 gm/sec

Warmed up engine, 2500 rpm (inspection mode [maintenance mode])

4.5 to 8.5 gm/sec

If the result is not as specified, clean the mass air flow meter sub-assembly.

If the result is within the specified range, inspect the mass air flow meter sub-assembly.

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): MASS AIR FLOW METER: INSPECTION

2. CLEAN MASS AIR FLOW METER SUB-ASSEMBLY

NOTICE:

If the mass air flow meter sub-assembly is removed and installed 10 times or more, the thread of the hole of the mass air flow meter sub-assembly may be damaged. Therefore, do not loosen the screws of the mass air flow meter sub-assembly.

(a) Remove the air cleaner cap sub-assembly.

*1

Mass Air Flow Meter Sub-assembly

*a

Air Blow Gun

*b

10 mm (0.394 in.)

*c

Airflow Hole

(b) Clean the mass air flow meter sub-assembly.

NOTICE:

  • Do not contact the mass air flow meter sub-assembly with the nozzle of the air blow gun.
  • Do not insert the nozzle of the air blow gun into the airflow hole.

(1) Using an air blow gun, clean the hole of the mass air flow meter sub-assembly by applying approximately 10 intermittent bursts of air to the airflow hole at a pressure of approximately 392 to 981 kPa (4.0 to 10.0 kgf/cm2, 57 to 142 psi).

*a

Air Blow Duration

*b

3 to 6 Seconds

*c

1 Second

*d

Air Blowing

*e

Air Stopped

(c) Install the air cleaner cap sub-assembly.

3. PERFORM INITIALIZATION

(a) Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION