Subaru IMPREZA GD 2007 Series Manual page 1998

asieps_tobira_IM_US.book 207 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Trouble Code (DTC) Detecting Criteria
CZ:DTC P1420 FUEL TANK PRESSURE CONTROL SOL. VALVE CIRCUIT HIGH
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 meeting the malfunction criteria below becomes time needed for
diagnosis (2.5 seconds) or more. 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 ON signal
Time Needed for Diagnosis: 2.5 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
(A)
(4)
(4) Diaphragm
(5) Valve
Enable Conditions
ON
≥ 10.9 V
1 second or more
Threshold Value
High
GD(H4DOTC)-207
GENERAL DESCRIPTION
(1)
(2)
(3)
(C)
(5)
(A) Atmospheric pressure
(B) Shut-off valve
(C) To fuel tank
EN-01759