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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (P0171 To P0685) (H4DOTC) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0303 Cylinder 3 Misfire Detected

DTC P0303 Cylinder 3 Misfire Detected

Malfunction Criteria Threshold Value
Catalyst-damaging misfire diagnostic value ≥ Value from Map
MAP SPECIFICATION

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

Time needed for diagnosis:  200 engine revs.

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



Malfunction Criteria Threshold Value
Catalyst-damaging misfire diagnostic value ≥ Value from Map
MAP SPECIFICATION

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

Time needed for diagnosis:  200 engine revs.

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