Subaru 2009 IMPREZA Service Manual page 881

Diagnostic Trouble Code (DTC) Detecting Criteria
3. ENABLE CONDITIONS
Secondary Parameters
Time needed for all secondary parameters to be in enable
conditions
Battery voltage
Barometric 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
Elapsed time after starting the engine
Engine coolant temperature
Vehicle speed
Amount of intake air
Load change at 180°CA
Front oxygen (A/F) sensor impedance
Learning value of evaporation gas density
Total time of operating canister purge
Targeted lambda value load compensation coefficient
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously at a constant speed of 20 km/h (12.4 MPH) or more after 60000 ms have
passed since the engine started.
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
value
Time Needed for Diagnosis: 10000 ms
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 more
than the predetermined time.
Judgement Value
Malfunction Criteria
value
Time Needed for Diagnosis: Less than 1 second
4096 ms
10.9 V
75 kPa (563 mmHg, 22.2 inHg)
Execution
–0.2 V — 0.1 V
On Min.
On Max.
60000 ms
75 °C (167 °F)
20 km/h (12.4 MPH)
6 g/s (0.21 oz/s)
< 0.02 g/rev (0 oz/rev)
0 — 50
< 0.2
19.9 s
–0.03 — 0.000
Threshold Value
< 0.85
Threshold Value
0.85
GD(H4SO)-157
GENERAL DESCRIPTION
Enable Condition