Subaru IMPREZA GD 2007 Series Manual page 2063

asieps_tobira_IM_US.book 272 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
EP:DTC P2431 SECONDARY AIR INJECTION SYSTEM AIR FLOW /PRESSURE
SENSOR CIRCUIT RANGE/PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of secondary air pressure sensor output property.
Judge as NG when the secondary air pressure sensor output is largely different from the intake manifold
pressure at engine start.
2. ENABLE CONDITION
Secondary Parameters
Engine speed at engine start
Vehicle speed
After secondary air system stop
3. GENERAL DRIVING CYCLE
Perform the diagnosis with ignition switch ON.
4. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG when the continuous time of meeting the malfunction criteria below becomes 0.3 seconds or
more.
Judgment Value
Malfunction Criteria
|Secondary air pipe pressure – Intake
manifold pressure|
|Intake manifold pressure at engine start
– Intake manifold pressure|
Time Needed for Diagnosis: 0.3 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
Normality Judgment
Judge as OK and clear the NG when the continuous time of meeting the malfunction criteria below becomes
0.26 seconds or more.
Judgment Value
Malfunction Criteria
|Secondary air pipe pressure – Intake
manifold pressure|
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
< 300 rpm
< 1 km/h (1 MPH)
3 seconds or more
Threshold Value
≥ 26.7 kPa (200
mmHg, 7.89 inHg)
< 1.3 kPa (10 mmHg,
0.38 inHg)
Threshold Value
< 26.7 kPa (200
mmHg, 7.89 inHg)
GD(H4DOTC)-272