Toyota Avalon (XX50): Mass Air Flow Meter

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / A25a-fxs Engine Control / Mass Air Flow Meter

Components

COMPONENTS

ILLUSTRATION

*1

MASS AIR FLOW METER SUB-ASSEMBLY

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Inspection

INSPECTION

PROCEDURE

1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

(a) Perform a visual check for any foreign matter on the temperature sensor (thermistor) of the mass air flow meter sub-assembly shown in the illustration.

OK:

There is no foreign matter.

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

*a

Thermistor

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (THA) - 2 (E2G)

-20°C (-4°F)

13.6 to 18.4 kΩ

20°C (68°F)

2.21 to 2.69 kΩ

60°C (140°F)

0.49 to 0.67 kΩ

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

*a

Component without harness connected

(Mass Air Flow Meter Sub-assembly)

Installation

INSTALLATION

PROCEDURE

1. INSTALL MASS AIR FLOW METER SUB-ASSEMBLY

HINT:

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

Click here

(a) Install the mass air flow meter sub-assembly to the air cleaner cap sub-assembly with the 2 screws.

NOTICE:

  • If the mass air flow meter sub-assembly has been struck or dropped, replace it.
  • If reusing the mass air flow meter sub-assembly, be sure to inspect the O-ring.
  • Make sure that the O-ring is not cracked or moved out of place when installing the mass air flow meter sub-assembly.

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

2. PERFORM INITIALIZATION

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

Click here

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.

Click here

(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) 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).

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(5) Start the engine.

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

Powertrain > Engine > Data List

Tester Display

Mass Air Flow Sensor

(7) 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 (shift lever in P, engine warmed up, inspection mode [maintenance mode] and not charge control)

2.6 to 8.6 gm/sec

2500 rpm (shift lever in P, engine warmed up and inspection mode [maintenance mode] )

6.2 to 18.6 gm/sec

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

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

Click here

2. PERFORM INITIALIZATION

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

Click here

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 air flow meter sub-assembly removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure

Necessary Procedure

Effect/Inoperative Function when Necessary Procedure not Performed

Link

Replacement of mass air flow meter sub-assembly

Inspection after repair

  • Poor idle, etc.
  • Engine start function, etc.

PROCEDURE

1. REMOVE MASS AIR FLOW METER SUB-ASSEMBLY

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Remove the 2 screws and mass air flow meter sub-assembly from the air cleaner cap sub-assembly.

NOTICE:

If the mass air flow meter sub-assembly has been struck or dropped, replace it.

Knock Sensor

Relay

See More:

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

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