LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2018 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) (STI) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0441: EVAP System (CPC) Incorrect Purge Flow >> Execution Condition
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Execution Condition

EXECUTION CONDITION - EXCEPT FOR TYPE RA

Secondary parameters Execution condition
Time when Evaporative Leak Check Module switching valve is closed < 120000ms
Purge control duty ratio ? 0%
Precondition
(Conditions to close the switching valve of Evaporative Leak Check Module intrusively):
Battery voltage ≥ 10.9 V
Barometric pressure ≥ 75.1kPa (563mmHg, 22.2inHg)
Integrated purge gas amount since engine starting ≥ 72g(2.54oz) *
Barometric pressure - Manifold absolute pressure ≥ 17.3kPa (130mmHg, 5.1inHg)
(Duration time of the accelerator pedal position = 0% ≥ 1000ms
Accelerator pedal position since above) ? 0%
Ambient air temperature ≥ -25°C (-13°F)

* It is approximately 2 sec per the integration of purge to reach 1g at vehicle speed of 40 MPH.

EXECUTION CONDITION - TYPE RA

Secondary parameters Execution condition
Battery voltage ≥ 10.9V
Barometric pressure ≥ 75.06 kPa (563 mmHg, 22.2 inHg)
Integrated purge gas amount since engine starting ≥ 10 g (0.35 oz)*
(Duration time of the purge control duty ratio = 0% ≥ 1500ms
Purge control duty ratio from above) ? 0%
Ambient air temperature > -25°C (-13°F)
Time when the second purge valve control is OFF ≥ 1500ms
Time when the evaporative system leak check module switching valve is closed < 25000ms

* It is approximately 2 sec per the integration of purge to reach 1g at vehicle speed of 40 MPH.