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

(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.

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

Standard Condition:

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.

(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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