An atmospheric pressure sensor is used to detect changes in barometric pressure that can alter the intake air density, resulting in improper air-fuel ratio.
To compensate for this type of deviation, the amount of fuel injected is controlled.
For example, the amount of fuel injected is decreased to compensate for the lower intake air density caused by the decreased barometric pressure.(high altitude) The atmospheric pressure sensor is located in the ECM.
If the signal below threshold value, the ECM judges this as a fault and DTC is set.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Signal check, low | ● Faulty ECM |
Enable Conditions | ● Ignition on | |
Threshold Value | ● Output signal < 4.9V | |
Diagnostic Time | ● 2 sec. | |
MIL Fuel Limit Fuel Cut EGR Off | ● NO ● NO ● NO ● No | |
Fail safe | ● Barometric pressure is fixed at a value of 900 hPa by the ECM. |
Atmospheric Pressure SensoR | |
Pressure | Approx. 1000 ± 30 hPa |
