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: Inspection
- INSPECT MASS AIR FLOW METER ASSEMBLY
- Check the output voltage.
- Apply battery voltage across terminals 1 (+B) and 2 (E2G).TEXT IN ILLUSTRATION
*a Component without harness connected
(Mass Air Flow Meter)Air NOTE:While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.
- Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG) and the negative (-) tester probe to terminal 2 (E2G).
- Blow air into the mass air flow meter and check that the voltage fluctuates.
If the result is not as specified, replace the mass air flow meter assembly.
- Apply battery voltage across terminals 1 (+B) and 2 (E2G).
- Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass air flow meter shown in the illustration.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK
There is no foreign matter.
TEXT IN ILLUSTRATION*1 Platinum Hot Wire (Heater) If the result is not as specified, replace the mass air flow meter assembly.
- Check the intake air temperature sensor.TEXT IN ILLUSTRATION
*1 Resistance *2 Temperature *3 Acceptable - - *a Component without harness connected
(Mass Air Flow Meter)- - - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 4 (THA) - 5 (E2) -20°C (-4°F) 12.5 k to 16.9 kΩ 4 (THA) - 5 (E2) 20°C (68°F) 2.19 k to 2.67 kΩ 4 (THA) - 5 (E2) 60°C (140°F) 0.50 k to 0.68 kΩ If the result is not as specified, replace the mass air flow meter assembly.
- Measure the resistance according to the value(s) in the table below.
- Check the output voltage.
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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.