2009 Toyota Matrix Base, AutomaticFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

NOTE:
  • Perform the mass air flow meter inspection in accordance with the following procedure.
  • Only replace the mass air flow meter when there is foreign matter on the MAF meter platinum hot wire, or the MAF value in the Data List (with the engine stopped) is not within the normal operating range.
  1. INSPECT MASS AIR FLOW METER 
    1. Read the values using the Techstream (MAF).
    NOTE:
    • Perform the inspection with the vehicle indoors and on a level surface.
    • Perform the inspection of the mass air flow meter while it is installed into the air cleaner case (installed on the vehicle).
    • During the test, make sure that an exhaust air duct is not drawing air from the exhaust pipe.
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON (do not run the engine).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.
    5. Wait 30 seconds, and read the values on the Techstream.

      Standard Condition 

      TESTER DISPLAY CHART

      Tester Display Condition Standard Condition
      MAF
      • Engine is not running
      • 30 seconds after ignition switch is turned to ON
      		 Less than 0.26 g/sec

      HINT:

      • If the result is not as specified, replace the mass air flow meter.
      • If the result is within the specified range, inspect the mass air flow meter (See INSPECTION ).
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.