Subaru Legacy IV (2008 year). Service 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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