Gd(Sti) - Subaru Impreza 2005 General Description Manual

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 rev.
Learning value of EVAP conc. during
purge
Cumulative time of canister purge after
engine start
Continuous period after canister purge
starting
Map 5
Engine speed (rpm)
Measured value (g/rev)
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously at a constant 60 km/h (37.3 MPH).
4. DIAGNOSTIC METHOD
• Abnormality Judgment
Judge that the fuel system malfunction occurs when the time during completing the malfunction criteria below
continues 30 seconds or more by comparing the diagnosed value (fsobd) with threshold value.
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 for fuel system malfunction criteria for System E
Amount of air (g/s)
fsobdR1 (%)
Time Needed for Diagnosis: 10 seconds × 3 times
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
Judge OK when the malfunction criteria below are continued for 10 seconds.
Judgment Value
Malfunction Criteria
fsobd = (sglmd − tglmda) + faf + flaf
5. DTC CLEAR CONDITION
• When the OK idling cycle was completed 40 times in a row
• When "Clear Memory" was performed
Enable Conditions
In operation
75 ←→ 119°C (167
←→ 246°F)
≥ Map 5
≤ 0.02 g/rev
≤ 0.1
20 seconds or more
30 seconds or more
idle 800 1,200 1,600
NA 0.237 0.224 0.221
Threshold Value
≤ fsobdR1
See Map 4
fsobdR1 = rich side
threshold value of
fsobd
0 2.4 4.7 7
−40 −40 −36.9 −32.0
Threshold Value
≥ −20%
2,000 2,400 2,800
0.238 0.255 0.267
9.4 11.7
−27.0 −27.0

GD(STi)-76

3,200 3,600 4,000 4,400
0.242 0.243 0.258 0.263