Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 333
GD(H4DOTC)-84
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AU:DTC P0140 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK1
SENSOR2)
1. OUTLINE OF DIAGNOSIS
Detect the rear oxygen sensor open or short circuit. Judge as NG when the rear oxygen sensor voltage can
be determined to be abnormal considering conditions such as intake air amount, engine coolant tempera-
ture, main feedback control and deceleration fuel cut.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION (USED ONLY FOR MALFUNCTION JUDGMENT)
4. GENERAL DRIVING CYCLE
Perform the diagnosis once after starting the engine.
(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
Closed loop control at the rear oxygen sensor
In operation
Target output voltage of rear oxygen sensor
≥ 0.55 V + 0.05 V
Amount of intake air
≥ 10 g/s (0.35 oz/s)
Engine coolant temperature
≥ –40 °C (–40 °F)
Misfire detection every 200 rotations
< 65535 time(s)
Front oxygen (A/F) sensor compensation coefficient
Not in limit value
Battery voltage
≥ 10.9 V
Deceleration fuel cut of 5000 ms or more.
Experienced
EN-01696
(3)
V
(1)
(2)
(2)
(E)
(F)
(C)
(B)
(D)
(A)
GD(H4DOTC)-85
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. 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: 90000 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: Less than 1 second
Judgment Value
Malfunction Criteria
Threshold Value
Minimum output voltage
> 0.15 V
or
Maximum output voltage
< 0.55 V
Judgment Value
Malfunction Criteria
Threshold Value
Diagnosis of the rear oxygen sensor voltage low side
Incomplete
Minimum output voltage
≤ 0.15 V
Maximum output voltage
≥ 0.55 V
GD(H4DOTC)-86
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AV:DTC P0141 O2 SENSOR HEATER CIRCUIT (BANK1 SENSOR2)
1. OUTLINE OF DIAGNOSIS
Detect malfunction of the rear oxygen sensor heater.
Judge as NG if it is determined that the rear oxygen sensor impedance is large by observing the engine con-
ditions.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after 1000 ms seconds or more have passed since the engine started.
(1)
Element cover (outer)
(3)
Sensor element
(5)
Sensor housing
(2)
Element cover (inner)
(4)
Ceramic heater
Secondary Parameters
Enable Conditions
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 1000 ms
Engine coolant temperature
≥ 70 °C (158 °F)
A/F sensor element impedance
≤ 50 Ω
A/F sensor heater control duty
≤ 75 %
Rear oxygen sensor heater control duty
< 30 %
EN-01683
(1)
(2) (3)
(4)
(5)
GD(H4DOTC)-87
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. 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: 4 ms × 2500 time(s)
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 more
than the predetermined time.
Time Needed for Diagnosis: 4 ms × 2500 time(s)
Judgment Value
Malfunction Criteria
Threshold Value
Output terminal for heater characteristics failure detection
Low
Judgment Value
Malfunction Criteria
Threshold Value
Output terminal for heater characteristics failure detection
High
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