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Home >> Subaru >> 2019 >> 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 >> Execution Condition

Execution Condition

Secondary parameters Execution condition
Battery voltage
Fuel shut-off function
Engine speed
Intake manifold pressure
  • Normal ignition

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

  • Idle ignition

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


Time elapsed after engine start
Following condition A or B is met
A: Engine coolant temperature at engine start
B: Following conditions (b1) and (b2) are met
(b1) Engine coolant temperature at engine starting
(b2) Engine coolant temperature
8 V or more
Not in operation
400 RPM - 6100 RPM
13.3 kPa (99.8 mmHg, 3.9 inHg)
- 43.1 kPa (323.3 mmHg,
12.7 inHg)
12.8 kPa (96 mmHg, 3.8 inHg)
- 48.9 kPa (366.8 mmHg,
14.4 inHg)
2 crankshaft rotations or more
More than -7°C (19.4°F)
-7°C (19.4°F) or less
21°C (69.8°F) or more