Subaru Legacy IV (2008 year). Manual - part 181

 

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Subaru Legacy IV (2008 year). Manual - part 181

 

 

GD(H4SO)-26

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

M: 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)

GD(H4SO)-27

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: 5000 ms
High: 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.
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:
Low: Less than 1 second
High: Less than 1 second

Judgement Value

Malfunction Criteria

Threshold Value

Low

Output voltage

< 1.49 V

Engine speed

t 2000 rpm

Throttle opening angle

t 12 °

Intake manifold pressure

t 66.7 kPa (500 mmHg, 19.7 inHg)

High (1)

Output voltage

t 2.66 V

Engine speed

600 rpm — 900 rpm

Throttle opening angle

< 2.44 °

Intake manifold pressure

t 40 kPa (300 mmHg, 11.8 inHg)

High (2)

Output voltage

t 1.45 V

Engine speed

600 rpm — 900 rpm

Throttle opening angle

< 2.44 °

Intake manifold pressure

t 40 kPa (300 mmHg, 11.8 inHg)

Fuel system diagnosis

Rich side malfunction

Judgement Value

Malfunction Criteria

Threshold Value

Low

Output voltage

t 1.49 V

Engine speed

t 2000 rpm

Throttle opening angle

t 12 °

Intake manifold pressure

t 66.7 kPa (500 mmHg, 19.7 inHg)

High

Output voltage

< 2.66 V

Engine speed

600 rpm — 900 rpm

Throttle opening angle

< 2.44 °

Intake manifold pressure

< 40 kPa (300 mmHg, 11.8 inHg)

Fuel system diagnosis

Rich side normal

GD(H4SO)-28

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

N: DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT

1. OUTLINE OF DIAGNOSIS

Detect open or short circuits of the air flow sensor.
Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

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: 500 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

(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

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Output voltage

d 0.22 V

Judgement Value

Malfunction Criteria

Threshold Value

Output voltage

> 0.22 V

EN-01766

(3)

(4)

(2)

(1)

(A)

GD(H4SO)-29

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

O: DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT HIGH INPUT

1. OUTLINE OF DIAGNOSIS

Detect open or short circuits of the air flow sensor.
Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

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: 500 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

(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

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Output voltage

t 4.179943192 V

Judgement Value

Malfunction Criteria

Threshold Value

Output voltage

< 4.179943192 V

EN-01766

(3)

(4)

(2)

(1)

(A)

 

 

 

 

 

 

 

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