Subaru LEGACY 2006 Manual page 565

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
Purge control solenoid valve stuck open fault diagnosis
DTC
P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Purpose of Mode Z
When performing the leakage diagnosis of EVAP system, the purge control solenoid valve must operate nor-
mally. Therefore, mode Z is used to diagnose the purge control solenoid valve stuck open condition. Note
that if a purge control solenoid valve stuck open fault is detected, the EVAP system leakage diagnosis is can-
celled.
Diagnostic method
Purge control solenoid valve functional diagnosis is performed by monitoring the tank pressure in mode Z.
Normality Judgment
Judge as OK and change to Mode A when the criteria below are completed in 3 seconds after Mode Z start-
ed.
Judgment Value
Malfunction Criteria
(Tank pressure when Mode Z started) –
(Tank pressure when Mode Z finished)
Normal
(1) Mode Z
(2) 3 seconds
• evptez – evptezha ≤ 0.4 kPa (3.0 mmHg, 0.12 inHg)
• evptezini – evptezha ≤ 0.4 kPa (3.0 mmHg, 0.12 inHg)
Judge as normal when both calculations are established.
Threshold Value
≤ 0.4 kPa (3 mmHg,
0.12 inHg)
(1)
(2)
evptez
evptezini
(3)
0 (4)
(3) Fuel tank pressure
(4) 0.4 kPa (3.0 mmHg, 0.12 inHg)
GD(H4SO)-128
DTC
P0457
evptezha
(5)
(5) OK judgment
EN-02869