Mass Airflow Sensor
Operation
The Mass Airflow (MAF) sensor directly measures the mass of air being drawn into the engine. The sensor output is used to calculate injector pulse width. The (MAF) sensor is what is referred to as a "hot-wire sensor". The sensor uses a thin platinum wire filament, wound on a ceramic bobbin and coated with glass, that is heated to 200*C (417*F) above the ambient air temperature and subjected to the intake airflow stream. A "cold-wire" is used inside the (MAF) sensor to determine the ambient air temperature.
Battery voltage from the EEC power relay, and a reference signal and a ground signal from the PCM are supplies to the (MAF) sensor. The sensor returns a signal proportionate to the current flow required to keep the "hot-wire" at the required temperature. The increased airflow across the "hot-wire" acts as a cooling fan, lowering the resistance and requiring more current to maintain the temperature of the wire. The increased current is measured by the voltage in the circuit, as current increases, voltage increases. As the airflow increases the signal return voltage of a normally operating (MAF) sensor will increase.
Testing
1. Using a multimeter, check for voltage by back probing the (MAF) sensor connector.
2. With the key ON, and the engine OFF, verify that there is at least 10.5 volts between the VPWR and GND terminals of the (MAF) sensor connector. If voltage is not within specification, check power and ground circuits and repair as necessary.
3. With the key ON, and the engine ON, verify that there is at least 4.5 volts between the SIG and GND terminals of the (MAF) sensor connector. If voltage is not within specification, check power and ground circuits and repair as necessary.
4. With the key ON, and the engine ON, check voltage between GND and SIG RTN terminals. Voltage should be approximately 0.34-1.96 volts. If voltage is not within specification, the sensor may be faulty.
Removal & Installation (4.6L & 5.4L)
1. Disconnect the negative battery cable.
2. Release the air cleaner clamp and separate the air cleaner halves.
3. Remove the grommet from the air cleaner housing and slide the grommet down the hardness.
4. Remove the (MAF) sensor plate and (MAF) sensor from the air cleaner.
5. Detach the (MAF) sensor from the harness.
6. Remove the retaining nuts and remove the (MAF) sensor.
7. Installation is the reverse of removal.
It does not have a mass airflow sensor.It does not have a mass airflow sensor.
In center console...
a 2003 Chrysler Town and Country does not have a mass airflow sensor.
In your air box at the filter side
The Intake Air Tmperature Sensor is incorporated in the Mass Airflow Meter.
It does not have a mass airflow sensor.
where is the gas pump fuse located in a 2003 expedition
The "intake airflow temperature sensor" is actually the mass airflow sensor. It is located right behind the air filter box, it's the small piece of hard plastic tubing with the computer chip on top connected to the wires. To take it off, you disconnect the battery, unplug the computer chip, and unbolt it from the intake. If you want to clean it, buy some CRC Mass Airflow Sensor (MAF) cleaner. Should cost about 6 bucks at pepboys. Then follow the directions on the can.
It is important to know the location of a car's parts. The 2003 Volkswagen New beetle air intake temperature sensor is built into the mass airflow sensor.Ê
its the cable attached to the stock intake.
How do you replace the fog light located on a 2003 Ford Expedition?
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