2007 Lexus RX 400h FWDFACTORY OEM SERVICE PROCEDURE

Mass Air Flow Meter: Inspection

  1. INSPECT MASS AIR FLOW METER 
    1. Output voltage inspection.
      1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
      2. Connect the position (+) tester probe to terminal 3 (VG), and negative (-) tester probe to terminal 2 (E2G).
      3. Blow air into the MAF meter, and check that the voltage fluctuates.
    2. Resistance inspection.
      1. Using an ohmmeter, measure the resistance between terminals 4 (THA) and 5 (E2).

        Resistance 

        TERMINALS RESISTANCE

        Symbols (Terminal No.) Resistance Temperature
        THA (4) - E2 (5) 13.6 to 18.4 kΩ -20° (-4°F)
        THA (4) - E2 (5) 2.21 to 2.69 kΩ 20° (68°F)
        THA (4) - E2 (5) 0.49 to 0.67 kΩ 60° (140°F)
    Fig 1: Mass Air Flow Meter Resistance Graph
    G05200242Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.