Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001H9AY
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [02/2019 - 08/2020]
Title: A25A-FXS (ENGINE CONTROL): MASS AIR FLOW METER: ON-VEHICLE INSPECTION; 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]

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.

  • w/ Canister Pump Module:

    Click here 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM (w/ Canister Pump Module): INITIALIZATION 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM (w/ Canister Pump Module): INITIALIZATION

  • w/o Canister Pump Module:

    Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM (w/o Canister Pump Module): 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) According to the display on the Techstream, read the Data List when the engine is running.

Powertrain > Engine > Data List

Tester Display

Mass Air Flow Sensor

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, clean the mass air flow meter sub-assembly.

After cleaning (air blowing) the mass air flow meter sub-assembly, perform an on-vehicle inspection of the mass air flow meter sub-assembly again and replace the mass air flow meter sub-assembly if the result is not as specified.

If the result is within the specified range, check the intake air temperature sensor (thermistor) resistance.

Click here 2019 - 2024 MY RAV4 HV [11/2018 -        ]; A25A-FXS (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.

(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.