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:
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 REMOVAL/INSTALLATION).
3. Disconnect the MAP sensor connector.
4. Remove the MAP sensor
5. Install in
WARNING:
When performing a road test, be aware of other vehicles, people,
impediments, etc. to avoid an accident.
NOTE:
When the legal speed limit must be exceeded, use a chassis dynamometer.
Road Test Preparation
1. Inspect the engine coolant. (See ENGINE COOLANT LEVEL INSPECTION).
2. Insp
© 2016-2021 Copyright www.m2info.net