Subaru IMPREZA GD 2007 Series Manual page 1867

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
2. ENABLE CONDITION
Secondary Parameters
A/F main learning system
Engine coolant temperature
Engine load
Intake air change during 0.5 engine revs. ≤ 0.02 g (0.001 oz)/rev
Map 5
Engine speed
Idling
(rpm)
Measured value Non- 0.228
(g(oz)/rev) turbo (0.008)
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously at idling or at a constant speed after warming up the engine.
4. DIAGNOSTIC METHOD
Abnormality Judgment
Compare the diagnosed value (fsobd) with the threshold value, and if a condition meeting the malfunction cri-
teria below continues for 50 seconds or more, judge that there is a fault in the fuel system.
Judgment Value
Malfunction Criteria
fsobd = (sglmd – tglmda) + faf + flaf
where,
sglmd = measured lambda
tglmda = target lambda
faf = Main feedback compensation coef-
ficient
(every 64 milliseconds)
flaf = main feedback learning compensa-
tion coefficient
Map 4 Threshold value of fuel system malfunction criteria
Amount of air (g (oz)/s)
fsobdL1 (%) 40
Time Needed for Diagnosis: 10 seconds × 5 times
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
Normality Judgment
Judge as OK when the malfunction criteria below are met for 10 seconds or more.
Judgment Value
Malfunction Criteria
fsobd = (sglmd – tglmda) + faf + flaf
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 similar driving conditions are repeated 3 times and the result is OK.
• When "Clear Memory" is performed
Enable Conditions
In operation
≥ 70°C (158°F)
≥ Value from Map 5
800 1,200 1,600 2,000
0.22 0.22 0.22
(0.0078) (0.0078) (0.0078)
Threshold Value
≥ fsobdL1
See Map 4
fsobdL1 = lean side
threshold value of
fsobd
2.3 4.7 7
0
(0.081) (0.166) (0.247) (0.332)
40 36.9 32.0
Threshold Value
< 19%
GD(H4DOTC)-76
2,400 2,800 3,200
0.228 0.23 0.234
(0.008) (0.0081) (0.0083)
9.4 11.7 14.1
(0.413) (0.497)
27.0 26.5 26.5
3,600 4,000 4,400
0.242 0.250 0.250
(0.0085) (0.0088) (0.0088)