Mass Air Flow Meter On-Vehicle Inspection

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
1Az-Fe Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  1. INSPECT MASS AIR FLOW METER

Mass Air Flow Meter -- On-Vehicle Inspection


NOTICE:
  1. Perform the MAF meter inspection according to the procedures below.
  2. Only replace the MAF meter when both the LONG FT#1 value and MAF value in the DATA LIST (with the engine stopped) are not within the normal operating range.
HINT:
The type of ignition switch on this model differs according to the specifications of the vehicle. For the expressions used in this section, refer to the "EXPRESSIONS OF IGNITION SWITCH" precaution (RAV4_ACA30 RM00000215G00HX.html).


1. INSPECT MASS AIR FLOW METER


  1. Perform confirmation driving pattern.



      Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System.Mass Air Flow Meter On-Vehicle Inspection

    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester ON.

    4. Clear the DTCs (RAV4_ACA30 RM000000PDK0AHX.html).

    5. Start the engine and warm it up with all accessory switches OFF (until the engine coolant temperature is 75°C (167°F) or more).

    6. Drive the vehicle at 50 km/h (31 mph) or more for 3 to 5 minutes*1.

    7. Allow the engine to idle for 2 minutes*2.



    8. Perform steps *1 and *2 at least 3 times.


      Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System.Mass Air Flow Meter On-Vehicle Inspection

  1. Read the value using intelligent tester (Long FT#1).

    1. Select the following menu items: Powertrain / Engine and ECT / Data List / Primary / Long FT#1.

    2. Read the values displayed on the tester.

      Standard value:
      Within -15 to +15%
      If the result is not within the specified range, perform the inspection below.

  1. Read value using intelligent tester (MAF).

    NOTICE:
    1. Turn off the engine.
    2. Perform the inspection with the vehicle indoors and on a level surface.
    3. Perform the inspection of the MAF meter while it is installed to the air cleaner case (installed to the vehicle).
    4. During the test, do not use the exhaust air duct to perform suction on the exhaust pipe.

    1. Turn the ignition switch to acc.

    2. Turn the ignition switch on (do not start the engine).

    3. Turn the tester ON.

    4. Select the following menu items: Powertrain / Engine and ECT / Data List / Primary / MAF.

    5. Wait 30 seconds, and read the values on the intelligent tester.

      Standard condition:
      Less than 0.45 g/s
      1. If the result is not as specified, replace the MAF meter.
      2. If the result is within the specified range, inspect the cause of the extremely rich or lean air fuel ratio (RAV4_ACA30 RM000000WC3085X.html).