Ford barometric pressure sensor
Last Updated on July 23, 2024 by Mutiara
The Barometric Pressure (BP) sensor operates as a piezoelectric (pressure-sensing) disc. However, rather than generating a voltage, its output is a frequency change. The sensor changes frequency relative to intake manifold vacuum. The sensor frequency increases as vacuum increases. The BP sensor is used to sense the changes in barometric pressure, allowing the PCM to sense the altitude at which the vehicle is operating. Its signal affects, spark advance for altitude compensation.
The BP sensor was only used in early MAF systems. Starting in 1994 Ford learned that air pressure can be calculated once the MAF sensor tells the computer the amount of air ingested by the engine.
| Altitude | Barometric Pressure | BP Frequency | |
|---|---|---|---|
| Feet | Hg | kPa | Hz |
| 15000 | 16.9 | 57 | 120.4 |
| 14000 | 17.1 | 58 | 122.4 |
| 13000 | 18.3 | 62 | 125.5 |
| 12000 | 18.9 | 64 | 126.6 |
| 11000 | 19.5 | 66 | 128.7 |
| 10000 | 20.7 | 70 | 131.9 |
| 9000 | 21.0 | 72 | 138.1 |
| 8000 | 21.8 | 75 | 136.0 |
| 7000 | 23.0 | 78 | 138.3 |
| 6000 | 24.2 | 82 | 141.8 |
| 5000 | 25.0 | 84 | 144.0 |
| 4000 | 26.0 | 88 | 147.0 |
| 3000 | 26.6 | 91 | 150.0 |
| 2000 | 27.0 | 94 | 152.5 |
| 1000 | 28.9 | 98 | 156.1 |
| 0 | 29.92 | 100 | 159.0 |
| -1000 | 31.0 | 103 | 162.4 |
29.92 inHg= Sea Level, 100 kPa = Sea Level, 5280 ft = 1 mile, 14.7 PSI= Sea Level
The 1.6 L 3 cylinder turbocharged EcoBoost engine is an upcoming design in a number of Ford vehicles wearing the Read more
Common Ford power steering issues Ford power steering pump with reservoir. The power steering system commonly found on most Ford Read more
The Ford MTX-75 (Manual TransaXle), is a 5-speed transmission developed by Ford Motor Company for its larger engined front wheel drive models. "75" refers to Read more
This page contains some modifications that were done to a Ford Windstar with a 3.8 Ford Essex engine for amusement. Read more
Article & images courtesy of fordfuelinjection.com.
