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Home >> Subaru >> 2020 >> Crosstrek Base, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Control System (Diagnostics) (HEV) (2 Of 4)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0451: EVAP System Pressure Sensor/Switch Circuit Range/Performance >> General Description >> Diagnostic Method

Diagnostic Method

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If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Tank pressure sensor output value after pressing the fuel door release switch 3.52 kPa (1 inHg, 26.4 mmHg, 0.5psi) or more Or, -2.65 kPa (-0.8 inHg, -19.9 mmHg, -0.4psi) or less

Time needed for diagnosis:  Less than value of Map

MAP SPECIFICATION

Fuel tank pressure (kPa) when monitoring starts 5 10 20
Elapsed time (sec) 15 30 50

Engine warning light illumination:  Illuminates when refueling is performed twice under the faulty condition.