Hyundai Tucson: Mass Air Flow Sensor (MAFS)

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Control - Fuel System / Mass Air Flow Sensor (MAFS)


MAFS uses a hot-film type sensing element to measure the mass of intake air entering the engine, and send the signal to ECM.

A large amount of intake air represents acceleration or high load conditions while a small amount of intake air represents deceleration or idle.

The ECM uses this information to control the EGR solenoid valve and correct the fuel amount.



Circuit Diagram

Circuit Diagram

Harness Connector

Harness Connector



  1. Check the MAFS visually.
  • Mounting direction correct.
  • Any contamination, corrosion or damage on connector.
  • Air cleaner's clogging or wet.
  • MAFS cylinder's deforming or blocking by any foreign material.
  1. Check any leakage on intake system and intercooler system.


  1. Turn the ignition switch OFF and disconnect the battery (-) cable.
  2. Disconnect the mass air flow sensor connector (A) and the installation clamp (B).
  3. Remove the mass air flow sensor (C) after loosening mounting bolt.

Tightening Torque : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)



  • Install the component with the specified torques.
  • Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.
  • Be careful not to damage or deformation the sensing element and front grid.
  • Insert the sensor in the installation hole and be careful not to damage when installation.
  1. Install in the reverse order of removal.


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