Subaru Legacy IV (2008 year). Service manual — part 430
GD(H4DOTC)-170
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CQ:DTC P1160 RETURN SPRING FAILURE
1. OUTLINE OF DIAGNOSIS
Judge as NG when the valve is opened more than the default opening angle, but does not move to the close
direction with the motor power stopped.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
• Ignition switch ON
o OFF
• Ignition switch OFF
o ON (Only after clearing memory)
(1)
Opener spring
(4)
Full closed stopper
(7)
DC motor
(2)
Return spring
(5)
Throttle valve
(8)
Main and sub throttle position sensor
(3)
Intermediate stopper
(6)
Gear
Secondary Parameters
Enable Conditions
Battery voltage
t 6 V
Throttle position sensor
Normal
EN-04463
S S
(8)
(6)
(7)
(5)
(1)
(3)
(2)
(4)
GD(H4DOTC)-171
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 24 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: 3400 ms
Judgement Value
Malfunction Criteria
Threshold Value
Opening variation after continuity is set
to OFF
< 2 °
Judgement Value
Malfunction Criteria
Threshold Value
Opening variation after continuity is set
to OFF
t 2 °
GD(H4DOTC)-172
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CR: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
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis after starting the engine.
(A)
Barometric pressure
(B)
Shut-off valve
(C)
To fuel tank
(1)
Filter
(3)
Connector terminal
(5)
Valve
(2)
Coil
(4)
Diaphragm
Secondary Parameters
Enable Conditions
None
EN-01759
(1)
(2)
(3)
(4)
(5)
(A)
(B)
(C)
GD(H4DOTC)-173
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 2500 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Elapsed time after starting the engine
t 1 second
Terminal output voltage when ECM out-
puts OFF signal
Low
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Elapsed time after starting the engine
t 1 second
Terminal output voltage when ECM out-
puts OFF signal
High
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