Subaru IMPREZA GD 2007 Series Manual page 1964

asieps_tobira_IM_US.book 173 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Trouble Code (DTC) Detecting Criteria
CC:DTC P0506 IDLE AIR CONTROL SYSTEM RPM LOWER THAN EXPECTED
1. OUTLINE OF DIAGNOSIS
Detect the malfunction that actual engine speed is not close to target engine speed during idling. Judge as
NG when actual engine speed is not close to target engine speed during idling.
2. ENABLE CONDITION
Secondary Parameters
Engine coolant temperature
Battery voltage
Atmospheric pressure
Fuel level
After engine starting
Feedback of ISC
Lambda value
After switching air conditioner to ON/
OFF
After intake manifold pressure changes
by 4 kPa (30 mmHg, 1.2 inHg) or more.
After neutral switch ON/OFF change
Vehicle speed
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously at idling from 10 seconds after the engine start.
4. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG when the continuous time of completing the malfunction criteria below is 10 seconds × 3 times.
Judgment Value
Malfunction Criteria
Actual - target engine speed
Feedback value for ISC
Time Needed for Diagnosis: 10 seconds × 3 times
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
the time needed for diagnosis (10 seconds) or more.
Judgment Value
Malfunction Criteria
Actual - target 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
Enable Conditions
≥ 70°C (158°F)
≥ 10.9 V
> 75.0 kPa (563
mmHg, 22.2 inHg)
≥ 9 2 (2.38 US gal,
1.98 Imp gal)
10 seconds or more
In operation
0.90 — 1.1
5 seconds or more
> 5 seconds
> 5 seconds
0 km/h (0 MPH)
Threshold Value
< –100 rpm
Max.
Threshold Value
≥ –100 rpm
GD(H4DOTC)-173
GENERAL DESCRIPTION