Subaru LEGACY 2006 Manual page 593

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
4. DIAGNOSTIC METHOD
Calculate the Max. value (delflmax) and cumulative value (sumfl) of output voltage variation of fuel level sen-
sor during 12.2 seconds. Judge it normal when both max. and cumulative values are not over the threshold
value. Otherwise, when either of them is over the threshold value, the diagnosis counter counts up. Judge as
NG if the counter indicated 4 counts.
Diagnosis condition
Diagnosis timer
Fuel level sensor
A/D value
Amount of Fuel level
output voltage variation
Diagnosis counter
12.2S
Calculate the Max. value (delvflmx)
and the cumulative value (sumvfl).
3
2
1
0
NG at 4 counts
GD(H4SO)-156
Malfunction
Normal
6
5
4
EN-02216