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INSPECT MASS AIR FLOW METER SUB-ASSEMBLY
NOTE:
- Perform the MAF meter inspection by following the procedures below.
- 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.
1. Perform confirmation driving pattern.
  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch ON.
  3. Turn the tester on.
  4. Clear the DTCs (See DTC CHECK / CLEAR ).
  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 31 mph (50 km/h) or more for 3 minutes or more. *1
  7. Let the engine idle (accelerator pedal fully released) for 2 minutes or more. *2
  8. Preform steps *1 and *2 at least 3 times or more.
    
    Fig 2: Confirmation Driving Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Read value using the intelligent tester (LONG FT#1).
  1. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / LONG FT#1.
  2. Read the values displayed on the tester.
    Standard:
    
    Within -15% to +15%
    
    if the result is not within the specified range, perform the inspection below.
3. Read value using the intelligent tester (MAF).
  NOTE:
  - Turn off the engine.
  - Perform the inspection with the vehicle indoors and on a level surface.
  - Perform the inspection of the MAF meter while it is installed to the air cleaner case (installed to the vehicle).
  - During the test, do not use the exhaust air duct to perform suction on the exhaust pipe.
  1. Turn off the engine (do not run the engine).
  2. Turn the ignition switch ON.
  3. Turn the tester on.
  4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / MAF.
  5. Wait 30 seconds, and read the values on the intelligent tester.
    Standard condition:
    
    Less than 0.48 g/s
    - If the result is not as specified, replace the MAF meter.
    - If the result is within the specified range, inspect the cause of the extremely rich or lean air fuel ratio.

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.

Safety Warning

On-Vehicle Inspection

Use the Manual With the Right Hardware

When to See a Mechanic