Subaru IMPREZA GD 2007 Series Manual page 2262

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Diagnostic Trouble Code (DTC) Detecting Criteria
3. ENABLE CONDITION
Secondary Parameters
All secondary parameters enable condi-
tions
Battery voltage
Atmospheric pressure
Rear oxygen sensor sub feedback
Rear oxygen sensor output voltage –
Feedback target voltage
or rear oxygen sensor sub feedback
compensation coefficient
or rear oxygen sensor sub feedback
compensation coefficient
After engine starting
Engine coolant temperature
Vehicle speed
Amount of intake air
Load change during 0.5 engine revs.
Front oxygen (A/F) sensor impedance
Learning value of evaporation gas density ≤ 0.2
Total time of operating canister purge
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously at a constant vehicle speed of 20 km/h (12 MPH) or more after 60 seconds
have passed since the engine started.
5. DIAGNOSTIC METHOD
Judge as NG if the duration of time while the following criteria are met is the time needed for diagnosis (10
seconds) or more. Judge as OK and clear the NG when the malfunction criteria below are not met.
Judgment Value
Malfunction Criteria
Output λ value when rear oxygen sensor
sub feedback compensation coefficient
cannot be at minimum limit
Time Needed for Diagnosis: 10 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
• Front oxygen (A/F) sensor main learning compensation: Not allowed to calculate.
• Correction when re-starting at high temperature: Normally minimum value 0.3 → 0.
• Purge control: Not allowed to purge.
9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Enable Conditions
4 seconds or more
> 10.9 V
> 75.1 kPa (563
mmHg, 22.2 inHg)
Execution
–0.2 V ←→ 0.1 V
On Min.
On Max.
60 seconds or more
≥ 70°C (158°F)
≥ 20 km/h (12 MPH)
≥ 6 g/s
≤ 0.02 g (0.001 oz)/rev
0 ←→ 50 Ω
20 seconds or more
Threshold Value
≥ 1.15
GD(STI)-195
GENERAL DESCRIPTION