Subaru IMPREZA GD 2007 Series Manual page 2338

asieps_tobira_IM_US.book 271 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Trouble Code (DTC) Detecting Criteria
EN: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.
Judge as NG when the continuous time of meeting all the following conditions is 5 seconds or more. Judge
as OK and clear the NG when the conditions are not established.
Malfunction Criteria
Battery voltage
Time after secondary air system opera-
tion
Secondary air pressure – Secondary air
pressure before the secondary air opera-
tion
Engine
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
≥ 7 V
3 — 8 seconds
> 6.7 kPa (50 mmHg,
1.98 inHg)
In operation
GD(STI)-271
GENERAL DESCRIPTION