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Home >> Kia >> 2005 >> Sedona EX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> Troubleshooting >> Manifold Air Flow Sensor (MAFS) >> Troubleshooting Hints
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Troubleshooting Hints

  1. If the engine stalls occasionally, start the engine and shake the MAFS harness. If the engine stalls, check for poor contact at the MAFS connector.
  2. If the MAFS sensor output voltage is other than 0 when the ignition switch is turned ON (do not start the engine), check for faulty MAFS and ECM.
  3. If the engine can idle even if the MAFS output voltage is out of specification, check the conditions as below:
    • Air flow distributed from MAFS, disconnected air duct and clogged air cleaner filter.
    • Poor combustion in the cylinder, faulty spark plug, ignition coil, injector and incorrect comparison.
  4. Though no MAFS malfunction occurs, check the mounting direction of the MAFS.
    NOTE:
    • The air quantity of mass air flow sensor will be about 10% higher in case of new vehicle (within initial running of about 500 km (300 miles)).
    • Use an accurate digital voltmeter.
    • Before checking, warm up the engine until the engine coolant temperature reaches 80-90°C (175-198°F).
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