2004 Toyota RAV4 Base, FWD, AutomaticFACTORY OEM SERVICE PROCEDURE

Mass Air Flow (MAF) Meter: Inspection

  1. DISCONNECT MAF METER CONNECTOR 
  2. REMOVE MAF METER 

    Remove the 2 screws and MAF meter.

    Fig 1: Removing Screws And MAF Meter
    G02639437Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT MAF METER 
    1. Using an ohmmeter, measure the resistance between terminals THA and E2.
      Fig 2: Measuring Resistance Between Terminals THA And E2 Using Ohmmeter
      G02639438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Resistance: 

      RESISTANCE SPECIFICATION

      -20°C (-4°F) 13.6 to 18.4 Ω
      20°C (68°F) 2.21 to 2.69 Ω
      60°C (140°F) 0.49 to 0.67 Ω

      If the resistance is not as specified, replace the MAF meter.

    2. Inspect operation.
      1. Connect the MAF meter connector.
      2. Connect the negative (-) terminal cable to the battery.
      3. Turn the ignition switch ON.
      4. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
        5. Fig 3: Connecting Tester Probes To Terminals VG & E2G Using Voltmeter
        G02639439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Blow air into the MAF meter, and check that the voltage fluctuates.

        If operation is not as specified, replace the MAF meter.

      6. Turn the ignition switch OFF.
      7. Disconnect the negative (-) terminal cable from the battery.
      8. Disconnect the MAF meter connector.
  4. REINSTALL MAF METER 

    Install the MAF meter with the 2 screws.

  5. RECONNECT MAF METER CONNECTOR 
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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.