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.
Circuit Description
Mass Airflow (MAF) meter uses a platinum hot wire which is maintained at a constant temperature by controlling the current flow through the hot wire. Current flow is then measured as an output voltage. MAF meter may also be referred to as airflow meter. DTC is set when ECM detects MAF meter output is greater than 2.91 volts with Throttle Position (TP) sensor VTA circuit signal voltage of .42-.86 volt with engine coolant temperature greater than 158°F (70°C) for more than 10 seconds with engine speed of 1500 RPM or less, or MAF meter output is less than one volt with TP sensor VTA circuit signal voltage of 3 volts or more for at least 10 seconds with engine speed of 2100 RPM or more. Possible cause is defective MAF meter.
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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.