Subaru 2009 IMPREZA Service Manual page 1653

Diagnostic Trouble Code (DTC) Detecting Criteria
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
Minimum output voltage
or
Maximum output voltage
Time Needed for Diagnosis: 200000 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 following conditions are established.
Judgement Value
Malfunction Criteria
Diagnosis of the rear oxygen sensor volt-
age low side
Minimum output voltage
Maximum output voltage
Time Needed for Diagnosis: Less than 1 second
Threshold Value
> 0.15 V
< 0.55 V
Threshold Value
Incomplete
0.15 V
0.55 V
GD(H4DOTC)-65
GENERAL DESCRIPTION