Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Mass Air Flow Meter: Inspection
- INSPECT MASS AIR FLOW METER
- Measure the voltage to check the mass air flow sensor.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Apply battery voltage across terminals 1 (+B) and 2 (E2G).
- Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG), and negative (-) tester probe to terminal 2 (E2G).
- Blow air into the mass air flow meter, and then check that the voltage fluctuates.
If the voltage does not fluctuate, replace the mass air flow meter.
- Measure the resistance to check the intake air temperature sensor.
- Using an ohmmeter, measure the resistance between the terminals 4 (THA) and 5 (E2).
Standard resistance
RESISTANCE SPECIFIED CONDITIONSTester Connection Specified Condition 4 (THA) - 5 (E2) 13.6 to 18.4 kΩ at -20°C (-4°F) 4 (THA) - 5 (E2) 2.21 to 2.69 kΩ at 20°C (68°F) 4 (THA) - 5 (E2) 0.493 to 0.667 kΩ at 60°C (140°F) If the result is not as specified, replace the mass air flow meter.
- Using an ohmmeter, measure the resistance between the terminals 4 (THA) and 5 (E2).
- Measure the voltage to check the mass air flow sensor.
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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.
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