The Barometric Pressure Sensor (BPS) is located between the air cleaner assembly and the throttle body. It detects the atmospheric pressure at the vehicle's current location. The barometric pressure sensor signal is used to calculates the density of the air. The Barometric Pressure Sensor plays an important role when driving in the mountains and in different altitiudes.
Checking output signals of BPS every 5 sec. under detecting condition, if an output signal is below 0.125V for more than 2.5 sec., ECM sets P2228.
Item
Detecting Condition
Possible cause
DTC Strategy
This code detects a continuous short to low or open in either the signal circuit or the BPS
Connecting Condition
Open or short to ground in power circuit
Open or short to ground in signal circuit
BPS
ECM
Enable Conditions
-
Threshold value
Signal < 0.125V
Diagnosis Time
Continuous
MIL On Condition
2 Drive Cycles
Pressure(kPa)
Voltage(V)
10.0
0.50
55.0
2.21
100.0
3.93
115.0
4.50
Fig 1) Normal data & waveform of BPS at approx. 1 atm condition.