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Home >> Subaru >> 2021 >> Crosstrek Sport >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (Engine Control System (HEV) (Diagnostics) (2 Of 4)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P04EC: EVAP System Large Leak Detected - Fuel Tank Side >> General Description >> Diagnostic Method >> < Mode B (measurement of reference pressure for setting the target negative pressure)>

< Mode B (measurement of reference pressure for setting the target negative pressure)>

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Judgment 1

Judge the reference pressure stability.

Judge as NG when the following conditions are established.

Judgment 2

Judge whether the reference pressure is within the normal range, and detect the vacuum pump and orifice malfunctions.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATIONS

Malfunction Criteria Threshold Value DTC
Judgment 1
|Pressure sensor maximum output value - Pressure sensor minimum output value|
More than 314Pa (2.355 mmHg, 0.1 inHg) P2404
Or,
Judgment 2
Reference pressure for setting the target negative pressure
Less than value of Map1
Or,
More than value of Map2
P2404
BAROMETRIC PRESSURE SPECIFICATIONS - MAP 1

Barometric pressure (kPa (mmHg, inHg)) 70 (525, 20.7 inHg) 80 (600, 23.6 inHg) 90 (675, 26.6 inHg) 100 (750, 29.5 inHg)
Reference pressure for setting the target negative pressure (kPa (mmHg, inHg)) -4 (-29.790, -1.2 inHg) -4.1 (-30.593, -1.2 inHg) -4.2 (-31.395, -1.2 inHg) -4.3 (-32.190, -1.3 inHg)
BAROMETRIC PRESSURE SPECIFICATIONS - MAP 2

Barometric pressure (kPa (mmHg, inHg)) 70 (525, 20.7 inHg) 80 (600, 23.6 inHg) 90 (675, 26.6 inHg) 100 (750, 29.5 inHg)
Reference pressure for judgment (kPa (mmHg, inHg)) -0.9 (-7.065, -0.3 inHg) -1 (-7.860, -0.3 inHg) -1.2 (-8.663, -0.3 inHg) -1.3 (-9.465, -0.4 inHg)