Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 334
GD(H4DOTC)-88
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AW:DTC P014C O2 SENSOR SLOW RESPONSE - RICH TO LEAN (BANK 1 SEN-
SOR 1)
1. OUTLINE OF DIAGNOSIS
Detect the slow response of front oxygen (A/F) sensor.
For diagnosis, detect the trouble by processing the λ waveform in normal driving without forcibly changing
the target air fuel ratio.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform diagnosis only once in a city driving including normal acceleration and deceleration.
(A)
Electromotive force
(B)
Air fuel ratio
(C)
Rich
(D)
Lean
(1)
Exhaust gas
(2)
ZrO
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
Accelerator pedal position
≠ 0%
EN-09361
(C)
(B)
(D)
(A)
(2)
(1)
(1)
GD(H4DOTC)-89
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD 1
Detect the malfunction by checking “Cumulative value of time when λ changes from lean → rich” in compar-
ison to “Time during which diagnosis is in progress”.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 90 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 following conditions are established.
Time Needed for Diagnosis: 90 seconds
(A)
Time during which diagnosis is in
progress
(B)
Cumulative value of time when λ
changes from lean → rich
Judgment Value
Malfunction Criteria
Threshold Value
DTC
(Cumulative value of time when λ changes from lean
→ rich) / (Time during which diagnosis is in progress)
< 0.39 (Models without SI-DRIVE)
< 0.42 (Models with SI-DRIVE)
P014C
> 0.63 (Models without SI-DRIVE)
> 0.56 (Models with SI-DRIVE)
P014D
Judgment Value
Malfunction Criteria
Threshold Value
DTC
(Cumulative value of time when λ changes from lean
→ rich) / (Time during which diagnosis is in progress)
≥ 0.39 (Models without SI-DRIVE)
≥ 0.42 (Models with SI-DRIVE)
P014C
≤ 0.63 (Models without SI-DRIVE)
≤ 0.56 (Models with SI-DRIVE)
P014D
EN-09340
time
Rich
Lean
(Sensor output)
Accumulated time
(B)
(A)
GD(H4DOTC)-90
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
6. DIAGNOSTIC METHOD 2
Detect the malfunction by the cumulative value obtained from the amount of variation in λ change.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 90 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 following conditions are established.
Time Needed for Diagnosis: 90 seconds
AX:DTC P014D O2 SENSOR SLOW RESPONSE - LEAN TO RICH (BANK 1 SEN-
SOR 1)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P014C. <Ref. to GD(H4DOTC)-88, DTC P014C O2 SENSOR
SLOW RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Cri-
(Sensor output)
EN-09341
n-2
n
n-1
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Cumulative value obtained from the amount of variation in λ change
Σ |(lambda(n) – lambda(n-1)) – (lambda(n-1) – lambda(n-2))|
< Value from Map
P014C and P014D
Map (Models without SI-DRIVE)
Cumulative value obtained from the amount of variation in λ
Σ |lambda(n) – lambda(n-1)|
0.00
4.00
Cumulative value obtained from the amount of variation in λ change
0.00
4.00
Map (Models with SI-DRIVE)
Cumulative value obtained from the amount of variation in λ
Σ |lambda(n) – lambda(n-1)|
0.00
6.00
Cumulative value obtained from the amount of variation in λ change
0.00
6.50
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Cumulative value obtained from the amount of variation in λ change
Σ |(lambda(n) – lambda(n-1)) – (lambda(n-1) – lambda(n-2))|
≥ Value from Map
P014C and P014D
GD(H4DOTC)-91
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AY:DTC P015A O2 SENSOR DELAYED RESPONSE - RICH TO LEAN (BANK 1
SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect the slow response of front oxygen (A/F) sensor.
For diagnosis, detect the trouble by processing the λ waveform in normal driving without forcibly changing
the target air fuel ratio.
2. COMPONENT DESCRIPTION
(A)
Electromotive force
(B)
Air fuel ratio
(C)
Rich
(D)
Lean
(1)
Exhaust gas
(2)
ZrO
2
EN-09361
(C)
(B)
(D)
(A)
(2)
(1)
(1)
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