Subaru Legacy IV (2008 year). Service manual — part 621
GD(H6DO)-104
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
During deceleration fuel cut from 53 km/h (approx. 33 MPH) or more, perform diagnosis once.
Be careful of vehicle speed and engine speed. (Diagnosis will not be completed if the vehicle speed and en-
gine speed conditions become out of specification due to deceleration.)
5. DIAGNOSTIC METHOD
Measure the pressure values when the enable conditions are established, and perform diagnosis by calcu-
lating those results.
1. Label the intake manifold pressure value as PMOF1, which is observed when enable conditions are es-
tablished, and set the EGR target step to 50 steps (nearly full open).
2. Label the intake manifold pressure value as PMON, which is observed after one second has passed since
EGR target step was set to 50 steps (when the enable conditions were established), and set the EGR target
step to 0.
3. Label the intake manifold pressure as PMOF2, which is observed after one second has passed since EGR
target step was set to 0 (after two seconds have passed since the enable conditions were established).
• Abnormality Judgement
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 1 time
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Secondary Parameters
Enable Conditions
Elapsed time after starting the engine
t 40 s
Engine coolant temperature
t 75 °C(167 °F)
Engine speed
1200 rpm — 3250 rpm
Intake manifold pressure (absolute pressure)
< 36.7 kPa (275 mmHg, 10.8 inHg)
Ambient air temperature
t 5 °C(41 °F)
Throttle position
< 0.25 °
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Vehicle speed
t53 km/h (32.9 MPH)
Fuel shut-off function
In operation
Neutral switch
OFF
After neutral switch ON/OFF change
t Value from Map
No load change (A/C, power steering, lighting,
rear defogger, heater fan and radiator fan)
t 5000 ms
Map
Engine coolant temperature
°C (°F)
–40
(–40)
–30
(–22)
–20
(–4)
–10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
After neutral switch change
msec
0
0
0
0
0
0
0
0
Engine coolant temperature
°C (°F)
40
(104)
50
(122)
60
(140)
70
(158)
80
(176)
90
(194)
100
(212)
110
(230)
After neutral switch change
msec
0
0
0
0
0
0
0
0
Judgement Value
Malfunction Criteria
Threshold Value
PMON – (PMOF1 + PMOF2)/2
< 1.6 kPa
(11.8 mmHg, 0.5 inHg)
GD(H6DO)-105
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
• Normality Judgement
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: 1 time
(A)
2000 ms
(C)
1500 ms
(D)
50 step(s)
(B)
1500
ms
Judgement Value
Malfunction Criteria
Threshold Value
PMON – (PMOF1 + PMOF2)/2
t 1.6 kPa (11.8 mmHg,
0.5 inHg)
EN-05568
ON
OFF
(Open)
(Close)
(Open)
(Close)
PMOF1
PMON
PMOF2
Deceleration fuel cut
Diagnosis enable condition
EGR target step
EGR actual step
DIagnostic mode timer
Start dignosis
(D)
(A)
(B)
(C)
Intake manifold pressure
(During normal condition)
GD(H6DO)-106
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CC:DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect the deterioration of the catalyst function.
Though the front oxygen sensor output would change slowly with a new catalyst, the sensor output with a de-
teriorated catalyst becomes high and the inversion time is shortened.
For this reason, the catalyst diagnosis is carried out by monitoring the front oxygen sensor output and com-
paring it with the front oxygen (A/F) sensor output.
2. COMPONENT DESCRIPTION
(A)
Normal
(C)
Output waveform from the front
oxygen (A/F) sensor
(D)
Output waveform from the front
oxygen sensor
(B)
Deterioration
(1)
Front oxygen (A/F) sensor
(2)
Front oxygen sensor
(3)
Catalytic converter
EN-01713
(A)
(B)
(C)
(D)
(1)
(2)
(3)
(3)
GD(H6DO)-107
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once at a constant 60 km/h (37.3 MPH) or higher.
5. DIAGNOSTIC METHOD
After establishing the execution conditions, calculate the front oxygen (A/F) sensor lambda deviation cumu-
lative value (
6 |(sglmd
n
– sglmd
n–1
)|) and rear oxygen sensor output voltage deviation cumulative value (
6
|(ro2sad
n
– ro2sad
n–1
)|) per 32 milliseconds × 4 , and when the front oxygen (A/F) sensor lambda deviation
cumulative value (
6 |(sglmd
n
– sglmd
n–1
)|) becomes the predetermined value or more, calculate the diag-
nostic value.
• Abnormality Judgement
If the duration of time while the following conditions are met is within the time indicated, judge as NG.
Time Needed for Diagnosis: 30 — 55 seconds
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 within
the predetermined time.
Time Needed for Diagnosis: 30 — 55 seconds
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Atmospheric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Engine coolant temperature
t 75 °C (167 °F)
Estimated catalyst temperature
t 560 °C (1040 °F)
Misfire detection every 200 rotations
< 7 time(s)
Learning value of evaporation gas density
< 0.2
Sub feedback
In operation
Evaporative system diagnosis
Not in operation
Time of difference (< 0.10) between actual
lambda and target lambda
t 1000 ms
Vehicle speed
> 60 km/h (37.3 MPH)
Amount of intake air
t 10 g/s (0.35 oz/s)
and
< 40 g/s (1.41 oz/s)
Engine load change every 0.5 engine speed. < 0.02 g/rev (0 oz/rev)
Rear oxygen output change from 660 mV or
less to 660 mV or more
Experienced after fuel cut
Elapsed time after starting the engine
t 205 s
Purge execution calculated time
t 5 s
Judgement Value
Malfunction criteria
Threshold value
6 |(ro2sad
n
– ro2sad
n–1
)| /
6 |(sglmd
n
–
sglmd
n–1
)|
> 25
Judgement Value
Malfunction criteria
Threshold value
6 |(ro2sad
n
– ro2sad
n–1
)| /
6 |(sglmd
n
–
sglmd
n–1
)|
d 25
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