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.
on the top of the differential
the tail shaft of the tranny on the speedo cable
where is the CHT sensor on a 2000 ford F150 where is the CHT sensor on a 2000 ford F150
In the ducting before the throtle body.
it's on the intake manifold.
The Mass Air Flow Sensor is the cylindrical metal sensor that is attached to your F-150's air filter assembly under the hood of your truck.
how to replace an oil pan that goes to a ford f150 1993? how much does the pan cost,and can you show a picture of it?
on top of heater housing
i may be wrong so call your local dealer, i believe is on the transmission
On a 2004 Ford F150, the vehicle speed sensor is located on the driveshaft of the transmission. Some models of 2004 Ford F150s use an ABS sensor instead of a vehicle speed sensor.
Wher is the o2 sensor on a 2006 ford f150
Yes.