Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 349
GD(H4DOTC)-148
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CJ: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 Judgment
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 Judgment
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
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Ignition
ON
Terminal output voltage when ECM outputs OFF signal LOW
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Ignition
ON
Terminal output voltage when ECM outputs OFF signal HIGH
GD(H4DOTC)-149
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CK: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 Judgment
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 Judgment
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
CL: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)-148, DTC P0413 SECONDARY AIR
INJECTION SYSTEM SWITCHING VALVE “A” CIRCUIT OPEN, Diagnostic Trouble Code (DTC) Detecting
CM: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)-149, DTC P0414 SECONDARY AIR
INJECTION SYSTEM SWITCHING VALVE “A” CIRCUIT SHORTED, Diagnostic Trouble Code (DTC) De-
Secondary Parameters
Enable Conditions
None
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Ignition
ON
Terminal output voltage when ECM outputs ON signal
HIGH
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Ignition
ON
Terminal output voltage when ECM outputs ON signal
LOW
GD(H4DOTC)-150
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CN: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
(B)
Deterioration
(C)
Output waveform from the front
oxygen (A/F) sensor
(D)
Output waveform from the front
oxygen sensor
(1)
Front oxygen (A/F) sensor
(2)
Front oxygen sensor
(3)
Catalytic converter
EN-01713
(A)
(B)
(C)
(D)
(1)
(2)
(3)
(3)
GD(H4DOTC)-151
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once at a constant speed of 40 km/h (24.9 MPH) or higher.
5. DIAGNOSTIC METHOD
After the enable conditions have been established, calculate the front oxygen (A/F) sensor lambda value
deviation sum value (Σ |(sglmd
n
– sglmd
n–1
)|), and rear oxygen sensor output voltage deviation sum value
(Σ |(ro2sad
n
– ro2sad
n–1
)|) in every 32 ms × 4 times. If the front oxygen (A/F) sensor lambda value deviation
sum value (Σ |(sglmd
n
– sglmd
n–1
)|) is the predetermined value or more, calculate the diagnostic value.
• Abnormality Judgment
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 Judgment
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
≥ 10.9 V
Atmospheric pressure
≥ 75 kPa (563 mmHg, 22.2 inHg)
Engine coolant temperature
≥ –50 °C (–58 °F)
Estimated catalyst temperature
≥ 490 °C (914 °F)
Misfire detection every 200 rotations
< 65535 time(s)
Learning value of evaporation gas density
< 1
Sub feedback
In operation
Evaporative system diagnosis
Not in operation
Time of difference (< 0.10) between actual lambda and target lambda ≥ 0 ms
Vehicle speed
> 40 km/h (24.9 MPH)
Amount of intake air
≥ 10 g/s (0.35 oz/s)
and
< 50 g/s (1.76 oz/s)
Engine load change every 0.5 engine revs.
< 255 g/rev (8.99 oz/rev)
Rear oxygen output change from 660 mV or less to 660 mV or more
Experienced after fuel cut
Purge execution calculated time
≥ 0 s
Judgment Value
Malfunction Criteria
Threshold Value
Σ |(ro2sad
n
– ro2sad
n–1
)| / Σ |(sglmd
n
– sglmd
n–1
)|
> 7.94 (Models without SI-DRIVE)
> 8 (Models with SI-DRIVE)
Judgment Value
Malfunction Criteria
Threshold Value
Σ |(ro2sad
n
– ro2sad
n–1
)| / Σ |(sglmd
n
– sglmd
n–1
)|
≤ 7.94 (Models without SI-DRIVE)
≤ 8 (Models with SI-DRIVE)
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