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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Control System (Diagnostics) (P0171 To P0685) (H4DO)) >> 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)

Mode E (Measurement Of Reference Pressure For Judgment)

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

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|
> 314Pa (2.355mmHg, 0.1i nHg) P2404
or
Judgment 2 Reference pressure for judgment
< Value of Map 4
or
> Value of Map 5
P2404
or
Judgment 3
|Reference pressure for setting the target negative pressure - Reference pressure for judgment|
> 941Pa
(7.058mmHg, 0.3i nHg)
P2404
MAP 4 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 (-34.0, -1.3) -4.6 (-34.8, -1.4) -4.7 (-35.6, -1.4) -4.9 (-36.4, -1.4)
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) -0.8 (-6.2, -0.2) -0.9 (-7.0, -0.3) -1 (-7.8, -0.3) -1.1 (-8.58, -0.3)

Time needed for diagnosis:  Approx. 24 min

At next engine start, confirm whether the enable conditions are satisfied even though refueling has been done during soaking, and determine the malfunction.

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