Subaru Legacy IV (2008 year). Service manual — part 609
GD(H6DO)-56
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform diagnosis only once at a constant speed of 10 km/h — 120 km/h (6.2 MPH — 74.6 MPH) 120000 ms
or more after starting the engine.
(A)
Electromotive force
(C)
Lean
(D)
Rich
(B)
Air fuel ratio
(1)
Atmosphere
(3)
ZrO
2
(4)
Ceramic heater
(2)
Exhaust gas
Secondary Parameters
Enable Conditions
Time needed for all secondary parame-
ters to be in enable conditions
t 1024 ms
Battery voltage
t 10.9 V
Barometric pressure
> 75 kPa (563 mmHg,
22.2 inHg)
Closed loop control with main feedback
Operation
Front oxygen (A/F) sensor impedance
0
: — 50 :
Elapsed time after starting the engine
t 120000 ms
Engine coolant temperature
t 75 °C (167 °F)
Engine speed
1000 rpm — 2500 rpm
Vehicle speed
10 km/h — 120 km/h
(6.2 MPH — 74.6 MPH)
Amount of intake air
10 g/s — 40 g/s
(0.35 oz/s — 1.41 oz/s)
Engine load
< 0.02 g/rev (0 oz/rev)
Learning value of EVAP conc. during
purge
< 0.2
Total time of operating canister purge
t 19.9 s
(1)
(2)
(4)
(2)
(3)
EN-01693
(C)
(B)
(D)
(A)
GD(H6DO)-57
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
Calculate faf difference every 32ms × 4 , and the
O value difference. Calculate the diagnosis value after cal-
culating 820 time(s).
• 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: 32 ms × 4 × 820 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: 32 ms × 4 × 820 time(s)
Judgement Value
Malfunction Criteria
Threshold Value
parafca = td2faf/td2lmd
> 0.2
where,
td2faf (N) = td2faf (n–1) + |d2faf (n)|
td2lmd (N) = td2lmd (n–1) + |d2lmd (n)|
add up to 32 ms × 4 × 820 time(s).
d2faf (n) = (faf (n) – faf (n–1)) – (faf (n–1)
– faf (n–2))
d2lmd (n) = (lmd (n) – lmd (n–1)) – (lmd
(n–1) – lmd (n–2))
faf = main feedback compensation coef-
ficient every 128 milliseconds
lmd = output lambda every 128 millisec-
onds
Judgement Value
Malfunction Criteria
Threshold Value
parafca = td2faf/td2lmd
d 0.2
where,
td2faf (N) = td2faf (n–1) + |d2faf (n)|
td2lmd (N) = td2lmd (n–1) + |d2lmd (n)|
add up to 32 ms × 4 × 820 time(s).
d2faf (n) = (faf (n) – faf (n–1)) – (faf (n–1)
– faf (n–2))
d2lmd (n) = (lmd (n) – lmd (n–1)) – (lmd
(n–1) – lmd (n–2))
faf = main feedback compensation coef-
ficient every 128 milliseconds
lmd = output lambda every 128 millisec-
onds
GD(H6DO)-58
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AN:DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED
(BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect open circuits of the sensor.
Judge as NG when the impedance of the element is large.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(A)
Electromotive force
(C)
Lean
(D)
Rich
(B)
Air fuel ratio
(1)
Atmosphere
(3)
ZrO
2
(4)
Ceramic heater
(2)
Exhaust gas
Secondary Parameters
Enable Conditions
None
(1)
(2)
(4)
(2)
(3)
EN-01693
(C)
(B)
(D)
(A)
GD(H6DO)-59
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: 5000 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: Less than 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Time of heater control duty at 70 % or
more
t 30000 ms
Front oxygen (A/F) sensor impedance.
> 500
:
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Front oxygen (A/F) sensor impedance.
d 500 :
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