Subaru Legacy IV (2008 year). Service manual — part 424
GD(H4DOTC)-146
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
The diagnosis counter does not count up when the following conditions are completed within 12288 ms.
Time Needed for Diagnosis: 12288 ms × 4 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: 12288 ms
Judgement Value
Malfunction Criteria
Threshold Value
Integrated times of the condition reaching
follows,
t 4 time(s)
DELFLMAX
t Value from Map
or
SUMFL
t 25.92 V
At this time,
DELFLMAX: Maximum difference of sen-
sor output for 12288 ms
SUMFL: Integrated value of the sensor
output deviation for12288 ms
Map
Fuel level (
2, US gal, Imp gal)
0, 0, 0
10, 2.64,
2.2
20, 5.28,
4.4
30, 7.93,
6.6
40, 10.57,
8.8
50, 13.21,
11
60, 15.85,
13.2
Measured voltage (V)
0.27
0.27
0.426
0.582
0.738
0.894
0.894
Maximum value – Minimum value of
change of tank pressure for 12288 ms
t 0 kPa (0.375 mmHg,
0 inHg)
Maximum value – Minimum value of bat-
tery voltage for12288 ms
t 0.969 V
Judgement Value
Malfunction Criteria
Threshold Value
DELFLMAX
< Value from Map
SUMFL
< 25.92 V
At this time,
DELFLMAX: Maximum difference of sen-
sor output for 12288 ms
SUMFL: Integrated value of the sensor
output deviation for12288 ms
GD(H4DOTC)-147
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BZ: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: 512 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: 512 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(H4DOTC)-148
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CA: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 70 °C (158 °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(H4DOTC)-149
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CB: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 70 °C (158 °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
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