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If the engine stalls occasionally, start the engine and shake the MAF sensor harness. If the engine stalls, check for poor contact at the MAF sensor connector.
If the MAF sensor output voltage is other than 0 when the ignition switch is turned on (do not start the engine), check for a faulty MAF sensor or PCM.
If the engine can idle even if the MAF sensor output voltage is out of specification, check for the following conditions;
- Disturbed air flow in the MAF sensor, disconnected air duct, and clogged air cleaner filter.
- Poor combustion in the cylinder, faulty ignition plug, ignition coil, injector, and incorrect comparison.
Even if no AFS malfunction occurs, check the mounting direction of the AFS.

Fig 1: Mass Airflow Specification Table
Courtesy of HYUNDAI MOTOR CO.

NOTE:

When the vehicle is new (within initial operation of about 500 km (300 miles)), the mass air flow sensor air quantity will be about 10% higher.
Use an accurate digital voltmeter.
Before checking, warm up the engine until the engine coolant temperature reaches 80 to 90°C (176 to 198° F).

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.

Safety Warning

Trouble Shooting Hints