Subaru Legacy IV (2008 year). Service manual — part 391
GD(H4DOTC)-14
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
E: DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect functional errors of the front oxygen (A/F) sensor heater.
Judge as NG when it is determined that the front oxygen (A/F) sensor impedance is large when looking at en-
gine status such as deceleration fuel cut.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after 42000 ms or more have passed since the engine started.
(1)
Gasket
(3)
Sensor housing
(4)
Protection tube
(2)
Ceramic
heater
Secondary Parameters
Enable Conditions
Condition established time
t 42000 ms
Battery voltage
t 10.9 V
Heater current
Permitted
Control duty
t 35 %
Experienced
After fuel cut
t 20000 ms
EN-02181
( 1 )
( 2 )
( 3 )
( 4 )
GD(H4DOTC)-15
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 10000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
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: 10000 ms
Judgement Value
Malfunction Criteria
Threshold Value
Front oxygen (A/F) sensor impedance
> 50
:
Judgement Value
Malfunction Criteria
Threshold Value
Front oxygen (A/F) sensor impedance
d 50 :
GD(H4DOTC)-16
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
F: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect front oxygen (A/F) sensor heater open or short circuit.
The front oxygen (A/F) sensor heater performs duty control, and the output terminal voltage at ON is 0 V, and
the output terminal voltage at OFF is the battery voltage.
Judge as NG when the terminal voltage remains Low.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(A)
Battery voltage
(C)
128 milliseconds
(D)
Low error
(B)
Front oxygen (A/F) sensor heater
output voltage
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
EN-01792
(C)
(A)
(B)
ON
OFF
0V
(D)
GD(H4DOTC)-17
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
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 × 250 time(s)
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
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
Judgement Value
Malfunction Criteria
Threshold Value
Output voltage level
Low
Front oxygen (A/F) sensor heater control
duty
< 87.5 %
Judgement Value
Malfunction Criteria
Threshold Value
Output voltage level
High
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