Subaru Legacy IV (2008 year). Service manual — part 602
GD(H6DO)-28
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
Judge as NG when Low side or High side becomes NG.
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis:
Low side: 3000 ms
High side: 10000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG when both Low side and High side become OK.
If the duration of time while the following conditions are met is longer than the time indicated, judge as OK.
Time Needed for Diagnosis:
Low side: Less than 1 second
High side: Less than 1 second
Judgement Value
Malfunction criteria
Threshold value
Low
Engine speed
< 2500 rpm
Throttle position
t 15 °
Output voltage
< 2.12 V
Engine load
> 0.87 g/rev (0.03 oz/rev)
High
Engine speed
500 rpm — 850 rpm
Throttle position
< 3.5 °
Output voltage
t 2.66 V
Engine load
< 0.6 g/rev (0.02 oz/rev)
Judgement Value
Malfunction criteria
Threshold value
Low
Engine speed
< 2500 rpm
Throttle position
t 15 °
Output voltage
t 2.12 V
Engine load
> 0.87 g/rev (0.03 oz/rev)
High
Engine speed
500 rpm — 850 rpm
Throttle position
< 3.5 °
Output voltage
< 2.66 V
Engine load
< 0.6 g/rev (0.02 oz/rev)
GD(H6DO)-29
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
R: DTC P0076 INTAKE VALVE CONTROL SOLENOID CIRCUIT LOW (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect the open circuit of the oil switching solenoid valve.
Judge as NG when the current is small even though the output duty is large.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. 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: 2000 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: 2000 ms
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Judgement Value
Malfunction criteria
Threshold value
Duty ratio
t 30 %
Control current
< 0.026 A
Judgement Value
Malfunction Criteria
Threshold Value
|Oil switching solenoid valve target cur-
rent value – Oil switching solenoid valve
current value|
< 0.08 A
Target current
t 0.11 A
GD(H6DO)-30
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
S: DTC P0077 INTAKE VALVE CONTROL SOLENOID CIRCUIT HIGH (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect short circuits of the oil switching solenoid valve.
Judge as a short NG when the current is large even though the output duty is small.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. 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: 2000 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: 2000 ms
T: DTC P0082 INTAKE VALVE CONTROL SOLENOID CIRCUIT LOW (BANK 2)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0076. <Ref. to GD(H6DO)-29, DTC P0076 INTAKE VALVE CON-
TROL SOLENOID CIRCUIT LOW (BANK 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>
U: DTC P0083 INTAKE VALVE CONTROL SOLENOID CIRCUIT HIGH (BANK 2)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0077. <Ref. to GD(H6DO)-30, DTC P0077 INTAKE VALVE CON-
TROL SOLENOID CIRCUIT HIGH (BANK 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Judgement Value
Malfunction criteria
Threshold value
Duty ratio
< 7 %
Control current
t 0.465 A
Judgement Value
Malfunction Criteria
Threshold Value
|Oil switching solenoid valve target cur-
rent value – Oil switching solenoid valve
current value|
< 0.08 A
GD(H6DO)-31
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
V: DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of air flow sensor output properties.
Judge as a low side NG when the air flow voltage indicates a small value regardless of running in a state
where the air flow voltage increases. Judge as a high side NG when the air flow voltage indicates a large val-
ue regardless of running in a state where the air flow voltage decreases. Judge air flow sensor property NG
when the Low side or High side becomes NG.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after idling.
(A)
Air
(1)
Air flow sensor
(3)
Voltage (V)
(4)
Amount of intake air (kg (lb)/s)
(2)
Intake air temperature sensor
Secondary Parameters
Enable Conditions
Engine coolant temperature
t 75 °C (167 °F)
EN-01766
(3)
(4)
(2)
(1)
(A)
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