Second Or More - Subaru Impreza 2005 General Description Manual

Diagnostic Trouble Code (DTC) Detecting Criteria
BC:DTC P0448 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL
CIRCUIT SHORTED
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of drain valve.
Judge NG when the ECM output level is different from the actual terminal level.
2. COMPONENT DESCRIPTION
(1) Magnetic plate
(2) Yoke
(3) Packing
(4) Spring
(5) Valve seat
3. ENABLE CONDITION
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
• Abnormality Judgment
Judge NG when the continuous time of completing the malfunction criteria below becomes more than 2.5
seconds.
Judgment Value
Malfunction Criteria
Ignition switch
Battery voltage
After engine starting
Terminal output voltage when ECM
sends ON signal
Time Needed for Diagnosis: 2.5 seconds
(1)
(2)
(10)
(9)
(6)
(7)
(8)
(9)
(10)
Enable Conditions
Threshold Value
ON
≥ 10.9 V

1 second or more

High
GD(STi)-143
GENERAL DESCRIPTION
(3)
(4)
(5)
(6)
(7)
(8)
Valve
Plate
Retainer
Movable core
Bobbin
EN-01730