Mass Air Flow Meter (For Sedan) On-Vehicle Inspection

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

  1. INSPECT MASS AIR FLOW METER

Mass Air Flow Meter (For Sedan) -- On-Vehicle Inspection


NOTICE:
  1. Perform the mass air flow meter inspection according to the procedures below.
  2. Only replace the mass air flow 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.


1. INSPECT MASS AIR FLOW METER


  1. Perform confirmation driving pattern.

    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Clear the DTCs (YARIS_NCP93 RM000000PDK0QGX.html).

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

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

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



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


      Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Mass Air Flow Meter (For Sedan) On-Vehicle Inspection

  1. Read the value using the Techstream (Long FT#1).

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

    2. Read the values displayed on the tester.

      Standard value:
      Within -20 to 20 %
      If the result is not within the specified range, perform the inspection below.

  1. Read the value using the Techstream (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 mass air flow meter while it is installed into the air cleaner case (installed on 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 run the engine).

    3. Turn the tester ON.

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

    5. Wait 30 seconds, and read the values on the Techstream.

      Standard condition:
      Less than 0.28g/sec
      1. If the result is not as specified, replace the mass air flow meter.
      1. If the result is within the specified range, investigate the cause of the extremely rich or lean air fuel ratio (YARIS_NCP93 RM000000WC30I9X.html).