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

READ NEXT:
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REMOVAL/INSTALLATION
1. Disconnect the negative battery cable.
2. Remove the fresh-air duct and the air cleaner as a single unit. (See
INTAKE-AIR SYSTEM REMOV
AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION
WARNING:
A hot engine and exhaust system can cause severe burns. Turn off the
engine and wait
until they are cool before removing the exhaust syst
HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION
WARNING:
A hot engine and exhaust system can cause severe burns. Turn off the
engine and wait
until they are cool before removing the exhaust syst
SEE MORE:
PID/DATA MONITOR DISPLAY
1. Connect the M-MDS(IDS) to the DLC-2.
2. After the vehicle is identified, select the following items from the
initialization screen of
the IDS.
Select "DataLogger".
Select "Modules".
Select "RCM".
3. Select the applicable PID from the PID table.
4. Verify the PID d
Overhead Lights
Front
Rear *
NOTE
(With map lights)
The rear overhead light also turn on and
off when the front overhead light switch
is operated.
Map Lights *
When the overhead light switch is in the
door or off position, press the lens to
illuminate the map lights, and then pres
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