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Home >> Subaru >> 2018 >> Crosstrek Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0455: EVAP System (CPC) Leak Detected (Large Leak) >> Diagnostic Method >> Mode E (Measurement Of Reference Pressure For Judgment)
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Mode E (Measurement Of Reference Pressure For Judgment)

Judgment 1

Purpose: Judge the reference pressure stability.

Judge as NG when the following conditions are established.

Judgment 2

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

Judge as NG when the following conditions are established.

Judgment 3

Purpose: Judge the presence of evaporative emission system leak.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value DTC
Judgment 1    
|Pressure sensor maximum output value - Pressure sensor minimum output value| More than 314Pa (2.355mmHg, 0.1inHg) P2404
or    
Judgment 2    
Reference pressure for judgment Less than value of Map5 P2404
or
More than value of Map6
or    
Judgment 3    
|Reference pressure for setting the target negative pressure - Reference pressure for judgment| More than 0.9kPa (7.058mmHg, 0.3inHg) P2404
MAP 5 SPECIFICATION

Barometric pressure (kPa (mmHg, inHg)) 70 (525, 20.7) 80 (600, 23.6) 90 (675, 26.6) 100 (750, 29.5)
Reference pressure for judgment (kPa (mmHg, inHg)) -4.5 (-34.02, -1.3) -4.6 (-34.815, -1.4) -4.7 (-35.618, -1.4) -4.9 (-36.42, -1.4)
MAP 6 SPECIFICATION

Barometric pressure (kPa (mmHg, inHg)) 70 (525, 20.7) 80 (600, 23.6) 90 (675, 26.6) 100 (750, 29.5)
Reference pressure for judgment (kPa (mmHg, inHg)) -0.9 (-6.18, -0.2) -0.9 (-6.983, -0.3) -1 (-7.785, -0.3) -1.1 (-8.58, -0.3)

Time needed for diagnosis:  23 min

Confirm the malfunction at next engine start.

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.