Subaru IMPREZA GD 2007 Series Manual page 1957

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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 12.3 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.
(A)
(B)
(C)
(D)
(E)
(A) Status of diagnosis
(B) Diagnosis Period
(C) Fuel level sensor A/D value
(D) Fuel level output voltage
12.3 seconds
(H)
(E) Diagnosis counter
(F) Malfunction
(G) Normal
GD(H4DOTC)-166
(F)
(I)
(H) Regard the value of DVFLMAX
and SUMVFL as Maximum.
(I) NG for the fourth time
(G)
EN-05559