Subaru Legacy IV (2008 year). Manual - part 209

 

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Subaru Legacy IV (2008 year). Manual - part 209

 

 

GD(H4SO)-138

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

BT:DTC P0500 VEHICLE SPEED SENSOR “A”

1. OUTLINE OF DIAGNOSIS

Judge as NG when outside of the judgment value.
Judge NG when the received data from ABSCM&H/U is abnormal vehicle speed, and the vehicle speed data
is impossible.

2. COMPONENT DESCRIPTION

Vehicle speed signals are taken in to the ABS control module and hydraulic control unit, and normal/errone-
ous data of the ABS wheel speed sensor is received by CAN communication from the ABS control module
and hydraulic control unit.

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform diagnosis more than 2000 ms after starting the engine.

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: 2500 ms

Secondary Parameters

Enable Conditions

Battery voltage

t 10.9 V

Elapsed time after engine starting

t 2000 ms

Judgement Value

Malfunction Criteria

Threshold Value

Front ABS wheel speed sensor status

Malfunction

Either of the following is established

 

Front left wheel speed

t 300 km/h (186.4 MPH)

Front right wheel speed

t 300 km/h (186.4 MPH)

Judgement Value

Malfunction Criteria

Threshold Value

Front left wheel speed

> 0 km/h (0 MPH)

 and

 

< 300 km/h (186.4 MPH)

Front right wheel speed

> 0 km/h (0 MPH)

 and

 

< 300 km/h (186.4 MPH)

GD(H4SO)-139

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

BU:DTC P0506 IDLE AIR CONTROL SYSTEM RPM LOWER THAN EXPECTED

1. OUTLINE OF DIAGNOSIS

Detect the malfunction that actual engine speed is not close to target engine speed during idling. Judge as
NG when actual engine speed is not close to target engine speed during idling.

2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE

Perform the diagnosis continuously at idling after warming up engine.

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: 10 s × 3 time(s)
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: 10 s

Secondary Parameters

Enable Conditions

Engine coolant temperature

t 75 °C (167 °F)

Battery voltage

t 10.9 V

Atmospheric pressure

t 75 kPa (563 mmHg, 
22.2 inHg)

Fuel level

t 9.6 

2 (2.54 US gal, 

2.11 Imp gal)

Elapsed time after starting the engine

t 10.49 s

Feedback of ISC

In operation

Lambda value (left and right)

t 0.81 

 and

 < 

1.1 

After switching air conditioner to ON/
OFF

t 5.1 s

After intake manifold pressure changes 
by 4 kPa (30 mmHg, 1.2 inHg) or more.

> 5.1 s

Elapsed time after switching neutral 
position switch to ON/OFF

> 5.1 s

Vehicle speed

0 km/h (0 MPH)

Judgement Value

Malfunction Criteria

Threshold Value

Actual engine speed — Targeted engine 
speed

< –100 rpm

Feedback compensation for ISC

Max.

Judgement Value

Malfunction Criteria

Threshold Value

Actual engine speed — Targeted engine 
speed

t –100 rpm

GD(H4SO)-140

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

BV:DTC P0507 IDLE AIR CONTROL SYSTEM RPM HIGHER THAN EXPECTED

1. OUTLINE OF DIAGNOSIS

Detect the malfunction that actual engine speed is not close to target engine speed during idling. Judge as
NG when actual engine speed is not close to target engine speed during idling.

2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE

Perform the diagnosis continuously at idling after warming up engine.

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: 10 s × 3 time(s)
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: 10 s

Secondary Parameters

Enable Conditions

Engine coolant temperature

t 75 °C (167 °F)

Battery voltage

t 10.9 V

Atmospheric pressure

t 75 kPa (563 mmHg, 
22.2 inHg)

Fuel level

t 9.6 

2 (2.54 US gal, 

2.11 Imp gal)

Elapsed time after starting the engine

t 10.49 s

Feedback of ISC

In operation

Lambda value (left and right)

t 0.81 

 and

 < 

1.1 

After switching air conditioner to ON/
OFF

t 5.1 s

After intake manifold pressure changes 
by 4 kPa (30 mmHg, 1.2 inHg) or more.

> 5.1 s

Elapsed time after switching neutral 
position switch to ON/OFF

> 5.1 s

Vehicle speed

0 km/h (0 MPH)

Judgement Value

Malfunction Criteria

Threshold Value

Actual – Target engine speed

t 200 rpm

Feedback value for ISC

Min.

Judgement Value

Malfunction Criteria

Threshold Value

Actual – Target engine speed

< 200 rpm

GD(H4SO)-141

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

BW:DTC P0512 STARTER REQUEST CIRCUIT

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of starter SW.
Judge as ON NG when the starter SW signal remains ON.

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: 180000 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

Secondary Parameters

Enable Conditions

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Engine condition

After engine starting

Starter OFF signal

Not detected

Battery voltage

t 8 V

Judgement Value

Malfunction Criteria

Threshold Value

Starter OFF signal

Detected

Battery voltage

t 8 V

 

 

 

 

 

 

 

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