Subaru Legacy IV (2008 year). 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)