Subaru IMPREZA GD 2007 Series Manual page 2067

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
EW:DTC P2444 SECONDARY AIR INJECTION SYSTEM PUMP STUCK ON
1. OUTLINE OF DIAGNOSIS
Detect the secondary air pump malfunction (always ON).
Judge as NG when the secondary air delivery pipe pressure is higher than the barometric pressure.
2. ENABLE CONDITION
Secondary Parameters
None
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. DIAGNOSTIC METHOD
The secondary air delivery pipe pressure should be as high as the barometric pressure when the secondary
air pump is OFF. Judge as NG when the pressure is higher than the barometric pressure.
Abnormality Judgment
Judge as NG when the continuous time of meeting the malfunction criteria below becomes 5 seconds or
more. Judge as OK and clear the NG when the malfunction criteria below are not established.
Judgment Value
Malfunction Criteria
Time after secondary air system opera-
tion
Battery voltage
Engine
Secondary air pipe pressure – Second-
ary air closing pressure
Time Needed for Diagnosis: 5 seconds
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
5. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
6. MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONS
• When the OK driving cycle is completed three times in a row
• When "Clear Memory" is performed
7. FAIL SAFE
None
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Enable Conditions
Threshold Value
3 — 8 seconds
≥ 7 V
In operation
> 6.7 kPa (50 mmHg,
1.98 inHg)
GD(H4DOTC)-276