Subaru 2009 IMPREZA Service Manual page 844

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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
Number of times that the difference
between the Max. fuel level every 60 s
and Min. fuel level every 60 s is 2 2
(0.53 US gal, 0.44 Imp gal) or more (with
enable condition established)
Maximum – Minimum tank pressure
(with enable condition completed)
Maximum – Minimum fuel temperature
(with enable condition completed)
If the difference between the Max. fuel level every 60 s and Min. fuel level every 60 s is less than 2 2 (0.53
US gal, 0.44 Imp gal), extend 60 s and make judgement with the Max. and Min. values for the fuel level in 60
s × 2. If a difference does not appear, extend the time (60 s × 3, 60 s × 4, 60 s × 5) and continue the judge-
ment. If the difference between the Max. fuel level every 60 s and Min. fuel level every 60 s is 2 2 (0.53 US
gal, 0.44 Imp gal) or more, the diagnosis counter counts up.
Time Needed for Diagnosis: 60 s × 16 time(s) or more
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
Maximum - Minimum tank pressure
Time Needed for Diagnosis: Less than 1 second
Threshold Value
16 time(s)
< 0 kPa (0.375 mmHg,
0 inHg)
7 °C (44.6 °F)
Threshold Value
0 kPa (0.375 mmHg,
0 inHg)
GD(H4SO)-120