Subaru LEGACY 2006 Manual page 630

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Diagnostic Trouble Code (DTC) Detecting Criteria
CP:DTC P1400 FUEL TANK PRESSURE CONTROL SOLENOID VALVE CIRCUIT
LOW
1. OUTLINE OF DIAGNOSIS
Detect the open/short circuit of pressure control solenoid valve.
Judge as NG when ECM output level is different from actual terminal level.
2. COMPONENT DESCRIPTION
(B)
(1) Filter
(2) Coil
(3) Connector terminal
3. ENABLE CONDITION
Secondary Parameters
Ignition switch
Battery voltage
After engine starting
4. GENERAL DRIVING CYCLE
Always perform the diagnosis after starting the engine.
5. DIAGNOSTIC METHOD
Judge as NG when the continuous time of completing the malfunction criteria below becomes more than time
needed for diagnosis (2.5 seconds). Judge as OK and clear the NG when the malfunction criteria below are
not met.
Judgment Value
Malfunction Criteria
Terminal output voltage when ECM out-
puts OFF signal
Time Needed for Diagnosis: 2.5 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
(A)
(4)
(4) Diaphragm
(5) Valve
Enable Conditions
ON
≥ 10.9 V
1 second or more
Threshold Value
Low
GD(H4SO)-193
GENERAL DESCRIPTION
(1)
(2)
(3)
(C)
(5)
(A) Atmospheric pressure
(B) Shut-off valve
(C) To fuel tank
EN-01759