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Home >> Subaru >> 2005 >> Outback XT Limited, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0442 Evaporative Emission Control System Leak Detected (Small Leak) >> Diagnostic Method >> Judgment Value >> Overview
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Judgment Value: Overview

JUDGMENT VALUE

Malfunction Criteria Threshold Value DTC
(Tank pressure when Mode Z started) - (Tank pressure when Mode Z finished) </= 0.4 kPa (3 mmHg, 0.12 inHg) P0457


JUDGMENT VALUE

Malfunction Criteria Threshold Value DTC
(Tank pressure when Mode Z started) - (Tank pressure when Mode 2 finished) > 0.6 kPa (4.5 mmHg, 0.18 inHg) P0457
Tank pressure when Mode Z started >/= 1.43 kPa (10.7 mmHg, 0.42 inHg)  
Time for no fuel rolling of 2 lambda or more >/= 40 seconds  

Time Needed for Diagnosis:  16 seconds

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

Finish the EVAP. diagnosis when making NG judgment for purge control solenoid valve open fixation.

Cancel the EVAP. diagnosis when the OK/NG judgment for drain valve close fixation and purge control solenoid valve open fixation cannot be made in Mode Z.

Fig 1: EVAP Operation Chart
G03830132Courtesy of SUBARU OF AMERICA, INC.

Judge normal when all calculations are completed.



JUDGMENT VALUE

Malfunction Criteria Threshold Value DTC
P2 - 1.5 x P1 > Value on Map 7. P0442
P2: Change of tank pressure within 10 seconds on Mode D (1) Threshold value: Figure (Fuel level vs Tank temperature)  
P1: Change of tank pressure within 10 seconds on Mode A    
(1) 1.5:  Compensation value of the amount of evaporator occurrence. (Because evaporator increases more when becoming negative pressure.)


JUDGMENT VALUE

Malfunction Criteria Threshold Value DTC
P1 < Map 7 value * Threshold value: map (fuel level vs evpdset) P0456


JUDGMENT VALUE

Malfunction Criteria Threshold Value DTC
P1 > Value of Map 8 * Threshold value: Map (Fuel level vs evpdset) P0456