Subaru 2009 IMPREZA Service Manual page 923

Diagnostic Trouble Code (DTC) Detecting Criteria
DS:DTC P2227 BAROMETRIC PRESSURE CIRCUIT RANGE/PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of barometric pressure sensor output property.
Judge as NG when the barometric pressure sensor output is largely different from the intake manifold pres-
sure at engine start.
2. COMPONENT DESCRIPTION
The barometric pressure sensor is built into the ECM.
3. ENABLE CONDITIONS
Secondary Parameters
Engine speed
Vehicle speed
4. GENERAL DRIVING CYCLE
Perform the diagnosis once at ignition switch ON.
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
|Barometric pressure – Intake manifold
pressure|
|Intake manifold pressure at engine start
– Intake manifold pressure|
Time Needed for Diagnosis: 328 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Judgement Value
Malfunction Criteria
|Barometric pressure – Intake manifold
pressure|
Time Needed for Diagnosis: 262 ms
Enable Condition
< 300 rpm
< 1 km/h (0.6 MPH)
Threshold Value
26.7 kPa (200 mmHg,
7.9 inHg)
< 1.3 kPa (9.99 mmHg,
0.4 inHg)
Threshold Value
< 26.7 kPa (200 mmHg,
7.9 inHg)
GD(H4SO)-199
GENERAL DESCRIPTION