Subaru Legacy IV (2008 year). Service manual — part 191
GD(H4SO)-66
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
• 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
Judgement Value
Malfunction Criteria
Threshold Value
fsobd = (sglmd – tglmda) + faf + flaf
< 1.2
GD(H4SO)-67
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AK:DTC P0172 SYSTEM TOO RICH (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect fuel system malfunction by the amount of main feedback control.
Diagnostic method
Fuel system is diagnosed by comparing the target air fuel ratio calculated by ECM with the actual air fuel ratio
measured by sensor.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously at idling or at a constant speed after warming up the engine.
4. DIAGNOSTIC METHOD
• Abnormality Judgement
Compare the diagnosed value (fsobd) with the threshold value, and if a condition meeting the malfunction cri-
teria below continues for 10 s × 5 time(s) or more, judge that there is a fault in the fuel system.
Time Needed for Diagnosis: 10 s × 5 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
• Normality Judgement
Judge as OK when the malfunction criteria below continues for 10 seconds.
Time Needed for Diagnosis: 10 s
Secondary Parameters
Enable Conditions
A/F main learning system
In operation
Engine coolant temperature
t 75 °C (167 °F)
Engine load change
d 0.02 g/rev (0 oz/rev)
Learning value of EVAP conc.
< 0.15
Cumulative time of canister purge after engine start
t 20 s
Continuous period after canister purge starting
t 29884 ms
Engine load
t Value of Map 1
Map1
Engine speed (rpm)
Idling
650
1000
1500
2000
2500
3000
3500
4000
4500
Measured value (g(oz)/rev)
Non-turbo
0.208
(0.01)
0.201
(0.01)
0.185
(0.01)
0.183
(0.01)
0.193
(0.01)
0.206
(0.01)
0.206
(0.01)
0.225
(0.01)
0.245
(0.01)
Judgement Value
Malfunction Criteria
Threshold Value
fsobd = (sglmd – tglmda) + faf + flaf
< Value of Map 2
In this case: sglmd = measured lambda
tglmda = target lambda
faf = main feedback compensation coefficient every 64 milliseconds
flaf = main feedback learning compensation coefficient
Map2
Amount of air (g (oz)/s)
0 (0)
3.2
(0.11)
6.4
(0.23)
9.6
(0.34)
12.8
(0.45)
16
(0.56)
19.2
(0.68)
fsobdL1 (%)
0.6
0.6
0.668
0.735
0.735
0.735
0.735
Judgement Value
Malfunction Criteria
Threshold Value
fsobd = (sglmd – tglmda) + faf + flaf
t 0.8
GD(H4SO)-68
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AL:DTC P0181 FUEL TEMPERATURE SENSOR “A” CIRCUIT RANGE/
PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect faults in the fuel temperature sensor output properties.
Diagnosis is performed in two methods (drift diagnosis and stuck diagnosis). If either is NG, judge as NG. If
both are OK, Judge as OK and clear the NG.
Drift Diagnosis
Normally fuel temperature is lower than engine coolant temperature. When the fuel temperature becomes
higher than the engine coolant temperature, the range is considered to be shifted, and judged as NG.
Stuck Diagnosis
As the engine warms up (cumulative amount of intake air after starting is large), if the fuel temperature which
should rise does not, determine as being stuck and NG.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
DRIFT DIAGNOSIS
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(A)
Resistance value (
:)
(B)
Fuel temperature °C (°F)
Secondary Parameters
Enable Conditions
None
EN-01700
(A)
(B)
GD(H4SO)-69
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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: 120 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: Less than 1 second
6. ENABLE CONDITION
Stuck Diagnosis
Judgement Value
Malfunction Criteria
Threshold Value
Fuel level
t 9.6
2 (2.54 US gal,
2.11 Imp gal)
Elapsed time after starting the engine
t 20 s
Engine coolant temperature – Engine
coolant temperature at engine start
> 10 °C (50 °F)
Fuel temperature – Engine coolant tem-
perature
t 10 °C (50 °F)
Battery voltage
t 10.9 V
Judgement Value
Malfunction Criteria
Threshold Value
Fuel level
t 9.6
2 (2.54 US gal,
2.11 Imp gal)
Elapsed time after starting the engine
t 20 s
Engine coolant temperature – Engine
coolant temperature at engine start
> 10 °C (50 °F)
Fuel temperature – Engine coolant tem-
perature
< 10 °C (50 °F)
Battery voltage
t 10.9 V
Engine coolant temperature
< 75 °C (167 °F)
Secondary Parameters
Enable Conditions
Elapsed time after starting the engine
t 20000 ms
Battery voltage
t 10.9 V
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