Subaru Legacy IV (2008 year). Service manual — part 413
GD(H4DOTC)-102
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BE:DTC P0413 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE “A”
CIRCUIT OPEN
1. OUTLINE OF DIAGNOSIS
Judge as NG when the ECM output level differs from the actual terminal level.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. 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: 2500 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
Secondary Parameters
Enable Conditions
None
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Ignition
ON
Terminal output voltage when ECM out-
puts OFF signal
LOW
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Ignition
ON
Terminal output voltage when ECM out-
puts OFF signal
HIGH
GD(H4DOTC)-103
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BF:DTC P0414 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE “A”
CIRCUIT SHORTED
1. OUTLINE OF DIAGNOSIS
Judge as NG when the ECM output level differs from the actual terminal level.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. 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: 2500 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
BG:DTC P0416 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE “B”
CIRCUIT OPEN
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0413. <Ref. to GD(H4DOTC)-102, DTC P0413 SECONDARY AIR
INJECTION SYSTEM SWITCHING VALVE “A“ CIRCUIT OPEN, Diagnostic Trouble Code (DTC) Detecting
Criteria.>
BH:DTC P0417 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE “B”
CIRCUIT SHORTED
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0414. <Ref. to GD(H4DOTC)-103, DTC P0414 SECONDARY AIR
INJECTION SYSTEM SWITCHING VALVE “A“ CIRCUIT SHORTED, Diagnostic Trouble Code (DTC) De-
tecting Criteria.>
Secondary Parameters
Enable Conditions
None
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Ignition
ON
Terminal output voltage when ECM out-
puts ON signal
HIGH
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Ignition
ON
Terminal output voltage when ECM out-
puts ON signal
LOW
GD(H4DOTC)-104
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BI: DTC P0418 SECONDARY AIR INJECTION SYSTEM CONTROL “A” CIRCUIT
OPEN
1. OUTLINE OF DIAGNOSIS
Judge as NG when the ECM output level differs from the actual terminal level.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. 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: 2500 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
Secondary Parameters
Enable Conditions
None
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Ignition
ON
Terminal output voltage when ECM out-
puts OFF signal
LOW
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Ignition
ON
Terminal output voltage when ECM out-
puts OFF signal
HIGH
GD(H4DOTC)-105
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BJ: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)
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