Subaru IMPREZA GD 2007 Series Manual page 1893

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
As shown in the following figure, pick a cylinder as the standard and name it omg 0. And the former crank-
shaft position speed is named omg 1, the second former crankshaft position speed is named omg 2, the third
is named omg 3, etc.
(A)
(B)
(A) Ignition order
180° Interval Difference Method
Diagnostic domg 180 = (omg 1 – omg 0) – (omg 7 – omg 1)/
value 6
Judge as a misfire in the following cases.
• domg 180 > judgment value of positive side
• domg 180 ≤ judgment value of negative side
(Judgment value before 180° CA)
domg180
domg180
(A) Threshold value (judgment value
of the positive side)
#3 #2 #4 #1
omg7 omg6 omg5
(B) Crankshaft position speed
(B) Threshold value (judgment value
of the negative side)
GD(H4DOTC)-102
#3 #2 #4 #1
omg4 omg3 omg2 omg1
(A)
(B)
(C)
(C) Judged as a misfire
#3 #2
omg0
EN-01774
EN-01775