Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: On-vehicle Inspection

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Mass Air Flow Meter / On-vehicle Inspection

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.

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(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) Start the engine.

(4) Turn the Techstream on.

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

Powertrain > Engine > Data List

Tester Display

Mass Air Flow Sensor

(6) 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 (engine warmed up)

2.6 to 3.7 gm/sec

2000 rpm (without load)

5.4 to 9.6 gm/sec

3000 rpm (without load)

10.6 to 15.8 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, check the intake air temperature sensor (thermistor) resistance.

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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.

(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

Mass Air Flow Meter Sub-assembly

*a

Air Blow Gun

*b

10 mm (0.394 in.)

*c

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).

HINT:

Apply 5 intermittent bursts of air to the airflow hole at 2 locations.

*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.

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    Components
    COMPONENTS ILLUSTRATION *1 AIR CLEANER CAP WITH AIR CLEANER HOSE *2 MASS AIR FLOW METER SUB-ASSEMBLY *3 NO. 1 FUEL VAPOR FEED HOSE *4 NO. 2 VENTILATION HOSE ...

    Removal
    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during mass ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

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