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Home >> Subaru >> 2021 >> Ascent Base >> 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 - 6100 rpm
Intake manifold pressure  
  • Normal ignition

    (Changes based on the engine speed and atmospheric pressure.)

13.3 kPa (99.8 mmHg, 3.9 inHg) - 43.1 kPa (323.3 mmHg, 12.7 inHg)
  • Idle ignition

    (Changes based on the engine speed and atmospheric pressure.)

12.8 kPa (96 mmHg, 3.8 inHg) - 48.9 kPa (366.8 mmHg, 14.4 inHg)
Time elapsed after engine start Following condition A or B is met 2 crankshaft rotations or more
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