MASS AIR FLOW (MAF) SENSOR INSPECTION [MZI-3.7]

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  Note
  • The MAF sensor and IAT sensor cannot be removed as a single unit. When replacing the MAF sensor or IAT sensor, replace it together with the MAF/IAT sensor as a single unit.

Visual Inspection

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].)

2. Disconnect the MAF/IAT sensor connector.

3. Remove the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [MZI-3.7].)

4. Verify the following items of the MAF sensor.

  • Dirt, damage, cracks
  • Rusted sensor terminal
  • Bent sensor terminal
    ― If there is any malfunction, replace the MAF sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [MZI-3.7].)

Voltage Inspection

1. Remove the MAF sensor with the connector still connected. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [MZI-3.7].)

2. Connect the M-MDS to the DLC-2.

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3. Turn the ignition switch to the ON position.

4. Verify that the MAF sensor output voltage (PID: MAF) changes when wind is introduced gradually to the sensor part of the MAF sensor. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].)

  • If it cannot be verified, replace the MAF sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [MZI-3.7].)