Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 335
GD(H4DOTC)-92
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform diagnosis only once in a city driving including normal acceleration and deceleration.
Diagnostic method 1
Secondary Parameters
Enable Conditions
Battery voltage
> 10.9 V
Closed loop control with main feedback
Operation
Front oxygen (A/F) sensor impedance
≥ 0 Ω
and
< 50 Ω
Elapsed time after starting the engine
≥ 0 ms
Engine coolant temperature
≥ –40 °C (–40 °F)
Engine speed
≥ 1000 rpm
Amount of intake air
≥ 10 g/s (0.35 oz/s)
Elapsed time after returning from the fuel cut
≥ 3000 ms
Accelerator pedal position
≠ 0%
Diagnostic method 2
Secondary Parameters
Enable Conditions
Battery voltage
> 10.9 V
Closed loop control with main feedback
Operation
Front oxygen (A/F) sensor impedance
≥ 0 Ω
and
< 50 Ω
Elapsed time after starting the engine
≥ 0 ms
Engine coolant temperature
≥ –40 °C (–40 °F)
Engine speed
≥ 1000 rpm
Amount of intake air
≥ 10 g/s (0.35 oz/s)
Elapsed time after returning from the fuel cut
≥ 3000 ms
Learning value of EVAP conc. during purge
< 1
Total time of operating canister purge
≥ 0 s
Engine load change
< 255 g/rev (8.99 oz/rev)
Accelerator pedal position
≠ 0%
Diagnostic method 3
Secondary Parameters
Enable Conditions
Battery voltage
> 10.9 V
Closed loop control with main feedback
Operation
Front oxygen (A/F) sensor impedance
≥ 0 Ω
and
< 50 Ω
Elapsed time after starting the engine
≥ 0 ms
Engine coolant temperature
≥ –40 °C (–40 °F)
Vehicle speed
≥ 40 km/h (24.9 MPH)
Engine speed
≥ 1000 rpm
and
< 4000 rpm
Amount of intake air
≥ 10 g/s (0.35 oz/s)
and
< 40 g/s (1.41 oz/s)
Learning value of EVAP conc. during purge
< 1
Catalyst depletion diagnosis
Not under diagnosis
GD(H4DOTC)-93
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD 1
Detect the malfunction depending on the average value of time necessary for λ to inverse the air fuel ratio
from “Lean → Rich → Lean” to “Rich → Lean → Rich”.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 50 times of inversion
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 following conditions are established.
Time Needed for Diagnosis: 50 times of inversion
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Average value of time necessary for λ to inverse the air
fuel ratio to Lean → Rich → Lean.
> 200 ms (Models without SI-DRIVE)
> 100 ms (Models with SI-DRIVE)
P015A
Average value of time necessary for λ to inverse the air
fuel ratio to Rich → Lean → Rich.
> 150 ms (Models without SI-DRIVE)
> 200 ms (Models with SI-DRIVE)
P015B
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Average value of time necessary for λ to inverse the air
fuel ratio to Lean → Rich → Lean.
≤ 200 ms (Models without SI-DRIVE)
≤ 100 ms (Models with SI-DRIVE)
P015A
Average value of time necessary for λ to inverse the air
fuel ratio to Rich → Lean → Rich.
≤ 150 ms (Models without SI-DRIVE)
≤ 200 ms (Models with SI-DRIVE)
P015B
EN-09342
time
Rich
Lean
(Sensor output)
GD(H4DOTC)-94
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
6. DIAGNOSTIC METHOD 2
Detect the malfunction by calculating the average amplitude of λ.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 11250 time(s) × 8 ms
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 following conditions are established.
Time Needed for Diagnosis: 11250 time(s) × 8 ms
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Average value for λ amplitude
> 0.1
P015A and P015B
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Average value for λ amplitude
≤ 0.1
P015A and P015B
EN-09343
time
Rich
Lean
Amplitude
(Sensor output)
GD(H4DOTC)-95
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
7. DIAGNOSTIC METHOD 3
Change STFT (A/F compensation value) by interruption, and measure the reaction time of λ value. When A/F
sensor malfunctions, the reaction time takes longer than at normal condition. In this case, judge as abnormal.
EN-09890
Time
Lean
Rich
Lean
Rich
STFT
Response time
Time
Sensor output
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