Subaru 2009 IMPREZA Service Manual page 805

Diagnostic Trouble Code (DTC) Detecting Criteria
180° Interval Difference Method
Diagnostic domg 180 = (omg 1 – omg 0) – (omg 5 – omg 1)/4
value
Judge as a misfire in the following cases.
• domg 180 > judgement value of positive side
• domg 180 judgement value of negative side
(Judgement value before 180° CA)
domg180
domg180
360° Interval Difference Method
Diagnostic domg 360 = (omg 1 – omg 0) – (omg 3 – omg 2)
value
Misfire domg 360 > Judgement value
judgement
domg360
domg360
Judged as misfire.
Judge as misfire
Judged as misfire.
GD(H4SO)-81
GENERAL DESCRIPTION
Threshold valve (positive number)
Threshold valve (negative number)
Threshold valve
EN-02877
EN-03273