Subaru Legacy IV (2008 year). Service manual - part 224
GD(H4SO)-198
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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 CONDITION
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.
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.
Time Needed for Diagnosis: 262 ms
Secondary Parameters
Enable Conditions
Engine speed
< 300 rpm
Vehicle speed
< 1 km/h (0.6 MPH)
Judgement Value
Malfunction Criteria
Threshold Value
|Barometric pressure – Intake manifold
pressure|
t 26.7 kPa (200 mmHg,
7.9 inHg)
|Intake manifold pressure at engine start
– Intake manifold pressure|
< 1.3 kPa (9.99 mmHg,
0.4 inHg)
Judgement Value
Malfunction Criteria
Threshold Value
|Barometric pressure – Intake manifold
pressure|
< 26.7 kPa (200 mmHg,
7.9 inHg)