Subaru Legacy IV (2008 year). Service manual — part 216
GD(H4SO)-166
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: 3000 s
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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
Fuel tank pressure
d –4 kPa (–30 mmHg,
–1.2 inHg)
Judgement Value
Malfunction Criteria
Threshold Value
Fuel tank pressure
> –4 kPa (–30 mmHg,
–1.2 inHg)
Cumulative time when all the malfunction
criteria below are met.
t 30000 s
Purge control solenoid valve duty
Not = 0
Fuel temperature
–10 °C (14 °F) — 70 °C
(158 °F)
Intake manifold relative pressure
t –26.7 kPa (–200 mmHg,
–7.9 inHg)
GD(H4SO)-167
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CO:DTC P1491 POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION
PROBLEM
1. OUTLINE OF DIAGNOSIS
Detect the blow-by hose release abnormality.
Judge as NG when the diagnosis terminal voltage is high.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(1)
Engine control module (ECM)
(3)
PCV diagnosis connector
(4)
5 V
(2)
Detecting
circuit
Secondary Parameters
Enable Conditions
None
EN-01790
E
(1)
(2)
(3)
(4)
GD(H4SO)-168
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 as soon as a malfunction occurs.
• 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
Engine condition
After engine starting
Positive crankcase ventilation diagnosis
voltage
High
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Engine condition
After engine starting
Positive crankcase ventilation diagnosis
voltage
Low
GD(H4SO)-169
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CP:DTC P1492 EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION
(LOW INPUT)
1. OUTLINE OF DIAGNOSIS
• Detects open or short circuit of EGR.
• Judge as NG when the ECM output level differs from the actual terminal level.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously during EGR operation.
(1)
Engine control module (ECM)
(3)
Detecting circuit
(5)
Battery voltage
(2)
Computer unit (CPU)
(4)
Switch circuit
(6)
Main relay
Secondary Parameters
Enable Conditions
Elapsed time after starting the engine
t 1 second
EGR valve target position
> 0 step
Battery voltage
t 10.9 V
EN-02051
(1)
(2)
(3)
(4)
(5)
(6)
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