Subaru IMPREZA GD 2007 Series Manual page 2246

asieps_tobira_IM_US.book 179 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Trouble Code (DTC) Detecting Criteria
CE:DTC P0519 IDLE AIR CONTROL SYSTEM PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect malfunctions that the engine speed continues to rise during idling.
2. ENABLE CONDITION
Secondary Parameters
Battery voltage
Feedback of ISC
Vehicle speed
After engine starting
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously if the vehicle speed is at less than 4 km/h (2.49 MPH).
4. DIAGNOSTIC METHOD
Abnormality Judgment 1
Judge as NG when the continuous time of meeting the all malfunction criteria below becomes the time need-
ed for diagnosis (2 seconds) or more.
Judgment Value
Malfunction Criteria
Engine speed - Targeted engine speed
Feedback value for ISC
Engine speed change every 180 degree
engine rev.
Time Needed for Diagnosis: 2 seconds
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
Normality Judgment
Judge as OK and clear the NG when the continuous time of meeting all the malfunction criteria below be-
comes the time needed for diagnosis (5 seconds) or more.
Judgment Value
Malfunction Criteria
Engine speed - Targeted engine speed
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
Fuel cut: Cuts off fuel only #1 and #2 cylinders, or for all cylinders according to vehicle speed, engine speed,
and throttle position.
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Enable Conditions
≥ 10.9 V
In operation
< 12 km/h (7.46 MPH)
1 second or more
Threshold Value
≥ 1,500 rpm
≤ 0%
≥ –5 rpm
Threshold Value
< 200 rpm
GD(STI)-179
GENERAL DESCRIPTION