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Home >> Subaru >> 2018 >> WRX Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) (Except For STI) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0301: Cylinder 1 Misfire Detected >> Diagnostic Method >> 720° Interval Difference Method

720° Interval Difference Method

Diagnostic value 720 degree interval difference = (A - B) - (E - F)
Judge as a misfire in the following cases.
  • 720 degree interval difference = Judgment value of positive side
  • 720 degree interval difference = Judgment value of negative side

    (Diagnostic value before 720° CA)

G12453878Courtesy of SUBARU OF AMERICA, INC.

• FTP 1.5 times misfire (misfire occurrence level which influences exhaust gas)

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
FTP emission diagnostic value = 24 x 100/2000% in 1000 revs. (CVT model)
= 35 x 100/2000% in 1000 revs. (MT model)

Time needed for diagnosis:  1000 engine revs.

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

• Catalyst-damaging misfire (misfire occurrence level that will damage catalyst)

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Catalyst-damaging misfire diagnostic value = Value from Map
CHARGING EFFICIENCY SPECIFICATION - MAP

Percentage (%) Charging efficiency (%)
15 30 45 60 75 90 105 120 135 150 165 180
Engine speed (rpm) 700 25 25 - - - - - - - - - -
1000 25 25 25 25 25 25 - - - - - -
1500 25 25 25 25 16.75 16.75 16.75 - - - - -
2000 25 25 25 25 16.75 14.25 12.5 - - - - -
2500 25 25 19.75 17 14.25 12.5 11 11 - - - -
3000 25 25 19.75 17 14.25 12 10.5 10 7.75 6 - -
3500 25 25 19.75 17 14.25 11 9 7.75 6 5 5 5
4000 - 25 19.75 17 14.25 11 8.25 6.25 5 5 5 5
4500 - 25 17.5 14.25 12.5 9 6.75 5 5 5 5 5
5000 - 25 16.75 12.5 11 8.25 6 5 5 5 5 5
5500 - 25 16 12 11 7.25 5 5 5 5 5 5
6000 - 25 15 11 11 6 5 5 5 5 5 5
6500 - 25 12.5 8.75 8.75 5 5 5 5 5 5 5
6800 - .25 11.25 7.5 5 5 5 5 5 5 5 5

Time needed for diagnosis:  200 engine revs.

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.