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Home >> Subaru >> 2023 >> WRX Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0304: Cylinder 4 Misfire Detected >> General Description >> Execution Condition

Execution Condition

Secondary parameters Execution condition
Battery voltage 8 V or more
Fuel shut-off function Not in operation
Engine speed 400 rpm - 6041 rpm
Intake manifold pressure
  • Normal ignition (Changes based on the engine speed and atmospheric pressure.)
17.7 kPa (132.8 mmHg, 5.2 inHg) - 42.7 kPa (320.3 mmHg, 12.6 inHg)
  • Idle ignition (Changes based on the engine speed and atmospheric pressure.)
19.7 kPa (147.8 mmHg, 5.8 inHg) - 44.7 kPa (335.3 mmHg, 13.2 inHg)
Elapsed time after first engine start 2 crankshaft rotations or more
Following condition A or B is met
A: Engine coolant temperature at engine start
More than -7°C (19.4°F)
B: Following conditions (b1) and (b2) are met
(b1) Engine coolant temperature at engine starting
-7°C (19.4°F) or less
(b2) Engine coolant temperature 21°C (69.8°F) or more