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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Control System (Diagnostics) (Except For STI) (2 Of 4)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0441: EVAP System (CPC) Incorrect Purge Flow >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different variant/trim than selected.

Close the Evaporative Leak Check Module switching valve, and close the fuel tank completely, and perform the forced purging. If pressure change amount is 667 Pa (5 mmHg, 0.2 inHg) or less, judge as malfunction of purge flow.

G13264366Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Evaporative Leak Check Module pressure (gauge) > -400Pa (3 mmHg, 0.1 inHg)
Integrated purge gas amount ≥ 3 g (0.11 oz)(1)
(1) It is approximately 2 sec per the integration of purge to reach 1g at vehicle speed of 40 MPH.

Time needed for diagnosis:  Less than 1 second

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