0
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.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
Where is the mass airflow sensor in a 2003 Chrysler town and country 3.3 v6?
It does not have a mass airflow sensor.It does not have a mass airflow sensor.
Where is the maf sensor on a 2003 Chrysler Town and Country?
a 2003 Chrysler Town and Country does not have a mass airflow sensor.
Where is the mass air flow sensor on a 2003 dodge ram 1500 4.7?
It does not have a mass airflow sensor.
Where is the Location of the Mass Airflow sensor on a 2003 Tiburon?
its the cable attached to the stock intake.
How do you change air temperature sensor on 2003 Astra?
how to change air temperature sensor on astra 2003 how to change air temperature sensor on astra 2003
Where is my 2003 Chevy Malibu Mass Airflow Sensor at?
On the tube between the air cleaner and the throttle body
How do you change cooling sensor on a kia rio 2003?
how do you change the cooling sensor on a kia rio 2003
Where is the transverse yaw sensor located in a 2003 Ford Expedition?
In center console...
Where is the intake air temperature sensor located on a 2003 VW Jetta VR6?
The Intake Air Tmperature Sensor is incorporated in the Mass Airflow Meter.
How do you change the knock sensor in a 2003 Chevy Silverado 5.3?
how do you change the knock sensor in a 2003 Chevy silverado 5.3
How do you clean the mass air flow sensor on a 2003 expedition?
you will almost always have to replace them.
Where is bank 1 sensor 1 on a 2003 Ford Expedition?
Bank 1 is the passenger side of the engine in your Ford Expedition Sensor 1 is in the exhaust before it enters the catalytic converter ( upstream )
