Mazda 2: Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor

MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION

CAUTION:

• Neither the MAF nor the IAT sensor cannot be removed as a single unit. When replacing the MAF or IAT sensor, replace it together with the other sensor as a single unit.

1. Disconnect the negative battery cable.

2. Disconnect the MAF/IAT sensor connector.

3. Remove the MAF/IAT sensor.

4. Install in the reverse order of removal.

MASS AIR FLOW (MAF) SENSOR INSPECTION

CAUTION:

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

1. Verify the connection condition of the MAF sensor/IAT sensor connector.

• If a connector has poor contact, install it correctly and then go to the next step.
• If the connector connection is normal, go to the next step.

2. Verify the MAF sensor voltage under no airflow conditions using the following procedure:

• Connect the M-MDS to the DLC-2.

CAUTION:

• Do not create suction in the exhaust pipe by cranking the engine and causing air to flow through the exhaust duct. It could cause a measurement error because the MAF sensor voltage is measured under no airflow conditions.

• Switch the ignition to ON (engine off) and wait for 30 s.
• Verify that the MAF/IAT sensor output voltage (PID: MAF).

Specification

• 0.65 V
• If it is the specification or more, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION).
• If it is less than the specification, go to the next step.

3. Remove the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION).

4. Verify that there is no foreign matter in the MAF/IAT sensor.

• Shine light on the sensor (Direction A in figure below) in the flow path and verify visually.

• If there is visible, large foreign matter, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION).
• If there is no foreign matter, go to the next step.

5. Verify that there is no damage, cracks, or dirt on the MAF sensor part of the MAD/IAT sensor.

• If a malfunction can be verified, repair or replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION).
• If a malfunction cannot be verified, go to the next step (MAF sensor is normal).

NOTE:

• Install the removed MAF/IAT sensor because the MAF sensor is normal.

6. Install the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION).

INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION

CAUTION:

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

1. Disconnect the negative battery cable.

2. Disconnect the MAF/IAT sensor connector.

3. Verify that the resistance between terminals D and E is within the specification.

• If not within the specification, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION).

IAT sensor specification

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