Subaru Legacy IV (2008 year). Service manual — part 411
GD(H4DOTC)-94
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BC:DTC P0410 SECONDARY AIR INJECTION SYSTEM
1. OUTLINE OF DIAGNOSIS
Detect NG judging from secondary air delivery pipe pressure, pulse of secondary air delivery pipe pressure
and secondary air pipe airflow amount.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Perform diagnosis during secondary air pump operation
Secondary Parameters
Enable Conditions
Pump supply pressure check
Estimate ambient temperature
t 4.4 °C
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg,
22.2 inHg)
Engine
In operation
Amount of intake air
t 2 g/s (0.07 oz/s)
Secondary air pump
Operating
Combination valve
Bank open (Except
with both banks
closed)
Combination valve both closed pulse
diagnosis
Estimate ambient temperature
t 4.4 °C
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg,
22.2 inHg)
Engine
In operation
Engine load
t 0.2 g/rev (0.01 oz/rev)
After fuel cut
t 1000 ms
Combination valve changeover pres-
sure diagnosis
Estimate ambient temperature
t 4.4 °C
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg,
22.2 inHg)
Engine
In operation
Amount of intake air
> 2 g/s (0.07 oz/s)
and
< 25 g/s (0.88 oz/s)
Engine speed
< 4000 rpm
After fuel cut
t 1000 ms
Overflow diagnosis
Estimate ambient temperature
t 4.4 °C
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg,
22.2 inHg)
Engine
In operation
GD(H4DOTC)-95
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
4. DIAGNOSTIC METHOD
Measure secondary air delivery pipe pressure, pulse of secondary air delivery pipe pressure and secondary
air pipe airflow amount.
(1)
IG
(7)
Diagnosis enable condition
(11)
Right bank all closed pressure
(POR) measurement
(2)
Ne
(8)
Pump supply pressure check
(judgment)
(3)
Secondary air pump operating
status
(12)
Both banks all closed pressure
(PORL) measurement
(9)
Flow amount check (judgment)
(4)
E-COMB valve (right hand) status
(10)
Barometric pressure (Pas) mea-
surement before secondary air
control
(13)
Left bank all closed pressure
(POL) measurement
(5)
E-COMB valve (left hand) status
(6)
Secondary air delivery pipe pres-
sure (psi)
(2)
(7)
(8)
(6)
(12)
(11)
(10)
(13)
(9)
EN-05591
(3)
ON
OFF
(1)
ON
OFF
(4)
OPEN
CLOSE
(5)
OPEN
CLOSE
GD(H4DOTC)-96
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Pump supply pressure check
Perform the system function diagnosis with how much the pressure rises when the secondary air pump is
turned from OFF to ON.
Judge as NG if delivery pipe pressure does not rise though it should when the secondary air pump turns OFF
o ON.
• 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: 1984 ms + 2816 ms
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: 1984 ms + 2816 ms
Combination valve both closed pulse diagnosis
Perform open stuck diagnosis of both combination valves using delivery pipe pressure pulse when both com-
bination valves are closed. Determine which side of valves is stuck open by comparing secondary air flow
amount when RH combination valve is closed with that when LH combination valve is closed.
Calculate voltage pulse of the pump supply pipe pressure when both combination valves are closed. The cal-
culation should be small because there is no pulse from supply pipe pressure with both combination valves
closed. When the calculation is large, determine that either of the combination valves is stuck open.
Determine which side of valves is stuck open by comparing secondary air flow amount when the RH combi-
nation valve is closed with that when the LH combination valve is closed. Air flow amount is larger on the
open stuck valve.
• 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: 4000 ms + 992 ms + 992 ms + 992 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Judgement Value
Malfunction Criteria
Threshold Value
DTC
Secondary air supply pipe pressure
(after barometric pressure compensation)
< 0.9 kPa (7 mmHg,
0.3 inHg)
P0410
Judgement Value
Malfunction Criteria
Threshold Value
DTC
Secondary air supply pipe pressure
(after barometric pressure compensation)
t 0.9 kPa (7 mmHg,
0.3 inHg)
P0410
Judgement Value
Malfunction Criteria
Threshold Value
DTC
Pulse calculation value when both com-
bination valves are closed
> Value of Map 1
P2440
Air flow amount when the right bank is
closed (value from Map 2)
t Air flow amount when
the left bank is closed
(value from Map 3)
Pulse calculation value when both com-
bination valves are closed
> Value of Map 1
P2442
Air flow amount when the left bank is
closed (value from Map 3)
> Air flow amount when
the right bank is closed
(value from Map 2)
GD(H4DOTC)-97
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: 4000 ms + 992 ms + 992 ms + 992 ms
Combination valve changeover pressure diagnosis
Perform the RH combination valve stuck closed diagnosis with the variation of delivery pipe pressure when
the RH combination valve turns closed
o open.
Delivery pipe pressure should vary when the RH combination valve turns closed
o open. When the variation
is small, determine that the RH combination valve is stuck closed.
• 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: 4000 ms + 992 ms + 992 ms + 992 ms
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: 4000 ms + 992 ms + 992 ms + 992 ms
Perform the LH combination valve stuck closed diagnosis with the variation of delivery pipe pressure when
the LH combination valve turns open
o closed.
Delivery pipe pressure should vary when the LH combination valve turns open
o closed. When the variation
is small, determine that the LH combination valve is stuck closed.
• 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: 4000 ms + 992 ms + 992 ms + 992 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Judgement Value
Malfunction Criteria
Threshold Value
DTC
Pulse calculation value when both com-
bination valves are closed
d Value of Map 1
P2440, P2442
Judgement Value
Malfunction Criteria
Threshold Value
DTC
Pressure variation value when the RH
combination valve is switched
< Value of Map 4
P2441
Judgement Value
Malfunction Criteria
Threshold Value
DTC
Pressure variation value when the RH
combination valve is switched
t Value of Map 4
P2441
Judgement Value
Malfunction Criteria
Threshold Value
DTC
Pressure variation value when the LH
combination valve is switched
< Value of Map 5
P2443
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