CAUTION: Sensing elements located in the mass airflow sensor should not be tampered with or cleaned.Section 03-14: Engine Controls, Electronic | 1996 F-150, F-250, F-350, F-Super Duty Series and Bronco Vehicles Workshop Manual |
Gasoline Engines
The mass air flow sensor (MAF sensor) (12B579) is located between the engine air cleaner (ACL) (9600) and the throttle body (9E926). The mass air flow sensor uses a hot wire sensing element to measure the amount of air entering the engine. Air passing over the hot wire causes it to cool. The mass air flow sensor then outputs an analog voltage signal to the powertrain control module (PCM) (12A650) to determine the intake air mass. The powertrain control module will calculate the required fuel injector pulse width in order to provide the desired air/fuel ratio.
The mass airflow sensor electronics module body element and housing are calibrated as a unit and must be serviced as a complete assembly.
CAUTION: Sensing elements located in the mass airflow sensor should not be tampered with or cleaned.
| Item | Part Number | Description |
|---|---|---|
| 1 | — | MAFS Electronics Module (Part of 12B579) |
| 2 | — | MAFS Body (Part of 12B579) |
| 3 | — | Airflow Bypass (Part of 12B579) |