Subaru Legacy IV (2008 year). Service manual — part 400
GD(H4DOTC)-50
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AB:DTC P0133 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect the slow response of front oxygen (A/F) sensor.
Front oxygen (A/F) sensor cover has some ventilation holes for exhaust gas. Clogged ventilation holes are
diagnosed.
When the holes are clogged, the A/F output variation becomes slow comparing with the actual A/F variation
because oxygen which reaches the zirconia layer is insufficient. Therefore, if the sensor cover holes are
clogged, the rich to lean judgment in the ECM is delayed when the actual change from rich to lean occurs.
Judge as NG when the actual movement in comparison to the ECM control amount is slow.
(1)
Cover
(2)
Zirconia
(3)
Clogging
EN-01694
(1)
(2)
(3)
GD(H4DOTC)-51
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
(4)
Ceramic heater
(1)
Atmosphere
(3)
ZrO
2
(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 70 °C (158 °F)
Engine speed
1000 rpm — 3200 rpm
Vehicle speed
10 km/h — 120 km/h
(6.2 MPH — 74.6 MPH)
Amount of intake air
10 g/s — 31 g/s
(0.35 oz/s — 1.09 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(H4DOTC)-52
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 1640 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 × 1640 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 × 1640 time(s)
Judgement Value
Malfunction Criteria
Threshold Value
parafca = td2faf/td2lmd
> 0.644 (AT model)
> 0.444 (MT model)
where,
td2faf (N) = td2faf (n–1) + |d2faf (n)|
td2lmd (N) = td2lmd (n–1) + |d2lmd (n)|
add up to 32 ms × 4 × 1640 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 0.644 (AT model)
d 0.444 (MT model)
where,
td2faf (N) = td2faf (n–1) + |d2faf (n)|
td2lmd (N) = td2lmd (n–1) + |d2lmd (n)|
add up to 32 ms × 4 × 1640 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(H4DOTC)-53
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AC: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)
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