Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 332
GD(H4DOTC)-80
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AS:DTC P013E O2 SENSOR DELAYED RESPONSE - RICH TO LEAN (BANK 1
SENSOR 2)
1. OUTLINE OF DIAGNOSIS
Detect the delayed response of rear oxygen sensor output for rich → lean.
After the deceleration fuel cut has started, detect the trouble by calculating the time when the rear oxygen
sensor output decreases to the predetermined voltages.
Judge as NG when the response time is larger than the threshold value.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform diagnosis once during deceleration fuel cut from a constant and high speed driving, when rear oxy-
gen sensor is warmed up sufficiently.
(A)
Electromotive force
(B)
Air fuel ratio
(C)
Lean
(D)
Rich
(E)
Theoretical air fuel ratio
(F)
Comparative voltage
(1)
Atmosphere
(2)
Exhaust gas
(3)
Electromotive force
Secondary Parameters
Enable Conditions
Battery voltage
> 10.9 V
Rear oxygen sensor closed loop control
Operation
Engine speed when fuel cut starts
≥ 1000 rpm
Rear oxygen sensor voltage when fuel cut starts
≥ 0.55 V
Fuel cut time
≥ 5000 ms
Engine coolant temperature when fuel cut starts
≥ –40 °C (–40 °F)
Estimated temperature of rear oxygen sensor element when fuel cut starts
≥ 450 °C (842 °F)
EN-01696
(3)
V
(1)
(2)
(2)
(E)
(F)
(C)
(B)
(D)
(A)
GD(H4DOTC)-81
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
Detect the trouble by calculating the time from the beginning of the fuel cut to the beginning of the rear oxy-
gen sensor voltage starting to drop.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 10 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: 10 seconds
(A)
0.5 V
(B)
0 V
(C)
Diagnostic parameter
(D)
Normal
(E)
Malfunction
Judgment Value
Malfunction Criteria
Threshold Value
Time when rear oxygen sensor voltage changed to 0.5 V after the fuel cut started.
> 4000 ms
Judgment Value
Malfunction Criteria
Threshold Value
Time when rear oxygen sensor voltage changed to 0.5 V after the fuel cut started.
≤ 4000 ms
(E)
EN-09346
(B)
(A)
Rear oxygen sensor (V)
Fuel cut on deceleration
(D)
(C)
GD(H4DOTC)-82
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AT:DTC P013F O2 SENSOR DELAYED RESPONSE - LEAN TO RICH (BANK 1
SENSOR 2)
1. OUTLINE OF DIAGNOSIS
Detect the delayed response of rear oxygen sensor output for lean → rich.
After the deceleration fuel cut has completed, detect the trouble by calculating the time when the rear oxygen
sensor output increases to the predetermined voltages.
Judge as NG when the response time is larger than the threshold value.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform diagnosis only once when recovering from the deceleration fuel cut continued for more than prede-
termined time with the rear oxygen sensor warmed up sufficiently.
(A)
Electromotive force
(B)
Air fuel ratio
(C)
Lean
(D)
Rich
(E)
Theoretical air fuel ratio
(F)
Comparative voltage
(1)
Atmosphere
(2)
Exhaust gas
(3)
Electromotive force
Secondary Parameters
Enable Conditions
Battery voltage
> 10.9 V
Front oxygen (A/F) sensor closed loop control
Operation
Engine speed
≥ 550 rpm
Rear oxygen sensor voltage when fuel cut has completed
< 0.15 V
Fuel cut time
≥ 5000 ms
Engine coolant temperature when fuel cut has completed
≥ –40 °C (–40 °F)
Estimated element temperature of rear oxygen sensor when fuel cut has completed
≥ 450 °C (842 °F)
EN-01696
(3)
V
(1)
(2)
(2)
(E)
(F)
(C)
(B)
(D)
(A)
GD(H4DOTC)-83
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
Detect the trouble by calculating the time from the completion of the fuel cut to the beginning of the rear ox-
ygen sensor voltage starting to rise.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 10 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: 10 seconds
(A)
0.3 V
(B)
0 V
(C)
Diagnostic parameter
(D)
Normal
(E)
Malfunction
Judgment Value
Malfunction Criteria
Threshold Value
The number of times that the rear oxygen sensor voltage changed to
0.3 V after the fuel cut has completed (time counter)
> 3750 time(s)
Judgment Value
Malfunction Criteria
Threshold Value
The number of times that the rear oxygen sensor voltage changed to
0.3 V after the fuel cut has completed (time counter)
≤ 3750 time(s)
(E)
(A)
EN-09347
(B)
Rear oxygen sensor (V)
Fuel cut on deceleration
(D)
(C)
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