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) sensor measure amount of air entering engine at a given time to determine fuel delivery. MAF sensor information is used for fuel delivery calculations. MAF sensor produces a frequency signal which can be monitored by a scan tool.
Conditions for setting DTC:
- Engine is running.
- No TP or MAP sensor DTCs are set.
- No EVAP DTCs are set.
- EGR DTC P0401 not set.
- MAF related DTCs not set.
- System voltage between 11-16 volts.
- Canister purge duty cycle less than 99.6 percent.
- Change in throttle position is less than 3.9 percent.
- EGR duty cycle not greater than 89.9 percent.
- EGR pintle position not greater than 89.9 percent.
- Engine vacuum is 75 kPa or less.
- Throttle position not greater than 89.8 percent.
- Conditions are met for greater than 2 seconds.
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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.