Subaru LEGACY 2006 Manual page 671

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DX:DTC P2228 BAROMETRIC PRESSURE CIRCUIT LOW
1. OUTLINE OF DIAGNOSIS
Detect the open/short circuit of the atmospheric pressure sensor.
Judge as NG if it is out of specification.
2. COMPONENT DESCRIPTION
The atmospheric pressure sensor is built into the ECM.
3. ENABLE CONDITION
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG when the continuous time of completing the malfunction criteria below becomes 0.5 seconds
or more.
Judgment Value
Malfunction Criteria
Ignition switch
Output voltage
Time Needed for Diagnosis: 0.5 seconds
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are met.
Judgment Value
Malfunction Criteria
Ignition switch
Output voltage
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
Threshold Value
ON
< 0.118 V
Threshold Value
ON
≥ 0.118 V
GD(H4SO)-234