Subaru 2009 IMPREZA Service Manual page 1719

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
Battery voltage
Elapsed time after starting the engine
Terminal output voltage when ECM out-
puts OFF signal
Time Needed for Diagnosis: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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
Battery voltage
Elapsed time after starting the engine
Terminal output voltage when ECM out-
puts OFF signal
Time Needed for Diagnosis: Less than 1 second
Threshold Value
10.9 V
1 second
Low
Threshold Value
10.9 V
1 second
High
GD(H4DOTC)-131
GENERAL DESCRIPTION