Subaru Legacy IV (2008 year). Service manual — part 632
GD(H6DO)-148
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CS: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 0.9
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(H6DO)-149
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CT: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 0.9
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(H6DO)-150
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CU: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
GD(H6DO)-151
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CV:DTC P0513 INCORRECT IMMOBILIZER KEY
1. OUTLINE OF DIAGNOSIS
2. ENABLE CONDITION
When starting the engine.
3. GENERAL DRIVING CYCLE
Perform the diagnosis only after starting the engine.
4. DIAGNOSTIC METHOD
Judge as NG when the conditions for the outline of the diagnosis of the top are established.
DTC
Item
Outline of diagnosis
P0513
Incorrect Immobilizer Key
Incorrect immobilizer key (Use of unregistered key in body integrated unit)
P1570
Antenna
Faulty antenna
P1571
Reference Code Incompatibility
Reference code incompatibility between body integrated unit and ECM
P1572
IMM Circuit Failure
(Except Antenna Circuit)
Communication failure between body integrated unit and ECM
P1574
Key Communication Failure
Failure of body integrated unit to verify key (transponder) ID code or transponder
failure
P1576
EGI Control Module EEPROM
ECM malfunctioning
P1577
IMM Control Module EEPROM
Body integrated unit malfunctioning
P1578
Meter Failure
Reference code incompatibility between body integrated unit and combination
meter
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