Subaru LEGACY 2006 Manual page 670

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Diagnostic Trouble Code (DTC) Detecting Criteria
DW:DTC P2227 BAROMETRIC PRESSURE CIRCUIT RANGE/PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of atmospheric pressure sensor output property.
Judge as NG when the atmospheric pressure sensor output is largely different from the intake manifold pres-
sure at engine starting.
2. COMPONENT DESCRIPTION
The atmospheric pressure sensor is built into the ECM.
3. ENABLE CONDITION
Secondary Parameters
Engine speed
Vehicle speed
4. GENERAL DRIVING CYCLE
Perform the diagnosis before engine starts with the ignition switch ON.
5. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG when the continuous time of completing the malfunction criteria below becomes 0.3 seconds
or more.
Judgment Value
Malfunction Criteria
|Atmospheric pressure – Manifold pres-
sure |
|Intake manifold pressure at engine star-
tup – Manifold pressure |
Time Needed for Diagnosis: 0.3 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Normality Judgment
Judge as OK and clear the NG when the continuous time of completing the malfunction criteria below be-
comes more than 0.3 seconds.
Judgment Value
Malfunction Criteria
Atmospheric pressure – Manifold pres-
sure
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
• When the OK driving cycle is completed 3 times in a row
• When "Clear Memory" is performed
8. FAIL SAFE
Atmospheric pressure sensor process: Fix the atmospheric pressure to 101 kPa (760 mmHg, 29.8 inHg).
9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Enable Conditions
< 300 rpm
< 1 km/h (0.62 MPH)
Threshold Value
≥ 26.7 kPa (200
mmHg, 7.88 inHg)
< 1.33 kPa (10 mmHg,
2.95 inHg)
Threshold Value
< 26.7 kPa (200
mmHg, 7.88 inHg)
GD(H4SO)-233
GENERAL DESCRIPTION