Subaru IMPREZA GD 2007 Series Manual page 1920

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Diagnostic Trouble Code (DTC) Detecting Criteria
3. ENABLE CONDITION
Secondary Parameters
Battery voltage
Atmospheric pressure
Engine coolant temperature
Misfire detection every 200 rotations
Learning value of evaporation gas den-
sity
Sub feedback
Evaporative system diagnosis
Time of difference (< 0.10) between
actual and target lambda
Vehicle speed
Amount of intake air
Engine load change every 0.5 engine
revs.
Rear oxygen output change from 600
mV or lower to 600 mV or higher
After engine starting
Calculated value of purge execution time
after engine start
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once at a constant speed of 75 km/h (47 MPH) after warming up.
5. DIAGNOSTIC METHOD
After the execution criteria are established, calculate the output fluctuation value of front oxygen (A/F) sensor
and output fluctuation value of rear oxygen sensor. Calculate the diagnosis value when the front oxygen (A/
F) sensor output fluctuation value become the specified value or more. A/F response properties and diagno-
sis values are parameters for the judgment value.
Judge as NG if the criteria below are met. Judge as OK if the criteria below are not met.
Judgment Value
Malfunction Criteria
Accumulated variation of rear oxygen
sensor output voltage per 32 millisec-
onds divided by lambda accumulated
variation of the front oxygen (A/F) sensor
per 32 milliseconds
Time Needed for Diagnosis: 33 — 55 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONS
• When the OK driving cycle is completed three times in a row
• When "Clear Memory" is performed
8. FAIL SAFE
None
Enable Conditions
> 10.9 V
> 75.0 kPa (563
mmHg, 22.2 inHg)
≥ 70°C (158°F)
< 5 times
< 0.20
In operation
Not in operation
1,000 milliseconds or
more
≥ 70 km/h (43 MPH)
11.5 ←→ 40 g/s (0.41
←→ 1.41 oz/s)
< 0.02 g (0.001 oz)/rev
Experienced after fuel
cut
≥ 235 seconds
≥ 19.9 seconds
Threshold Value
≥ 12.6
GD(H4DOTC)-129
GENERAL DESCRIPTION