Subaru Legacy IV (2008 year). Manual - part 414
GD(H4DOTC)-106
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once at a constant 60 km/h (37.3 MPH) or higher.
5. DIAGNOSTIC METHOD
After establishing the execution conditions, calculate the front oxygen (A/F) sensor lambda deviation cumu-
lative value (
6 |(sglmd
n
– sglmd
n–1
)|) and rear oxygen sensor output voltage deviation cumulative value (
6
|(ro2sad
n
– ro2sad
n–1
)|) per 32 milliseconds × 4 , and when the front oxygen (A/F) sensor lambda deviation
cumulative value (
6 |(sglmd
n
– sglmd
n–1
)|) becomes the predetermined value or more, calculate the diag-
nostic value.
• Abnormality Judgement
If the duration of time while the following conditions are met is within the time indicated, judge as NG.
Time Needed for Diagnosis: 30 — 55 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is within
the predetermined time.
Time Needed for Diagnosis: 30 — 55 seconds
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Atmospheric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Engine coolant temperature
t 70 °C (158 °F)
Estimated catalyst temperature
t 500 °C (932 °F)
Misfire detection every 200 rotations
< 5 time(s)
Learning value of evaporation gas density
< 0.2
Sub feedback
In operation
Evaporative system diagnosis
Not in operation
Time of difference (< 0.10) between actual
lambda and target lambda
t 1000 ms
Vehicle speed
> 60 km/h (37.3 MPH)
Amount of intake air
t 10 g/s (0.35 oz/s)
and
< 40 g/s (1.41 oz/s)
Engine load change every 0.5 engine revs.
< 0.02 g/rev (0 oz/rev)
Rear oxygen output change from 660 mV or
less to 660 mV or more
Experienced after fuel cut
Elapsed time after starting the engine
t 200 s
Purge execution calculated time
t 5 s
Judgement Value
Malfunction Criteria
Threshold Value
6 |(ro2sad
n
– ro2sad
n–1
)| /
6 |(sglmd
n
–
sglmd
n–1
)|
> 11 (AT model)
> 9 (MT model)
Judgement Value
Malfunction Criteria
Threshold Value
6 |(ro2sad
n
– ro2sad
n–1
)| /
6 |(sglmd
n
–
sglmd
n–1
)|
d 11 (AT model)
d 9 (MT model)