Subaru Legacy IV (2008 year). Service manual — part 392
GD(H4DOTC)-18
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
G: DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (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 High.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(A)
Battery voltage
(C)
128 milliseconds
(D)
High error
(B)
Front oxygen (A/F) sensor heater
output voltage
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
EN-01793
(C)
(A)
(B)
ON
OFF
0V
(D)
GD(H4DOTC)-19
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 × 500 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
High
Front oxygen (A/F) sensor heater control
duty
t 12.5 %
Judgement Value
Malfunction Criteria
Threshold Value
Output voltage level
Low
GD(H4DOTC)-20
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
H: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)
1. OUTLINE OF DIAGNOSIS
Detect the rear oxygen sensor heater open or short circuit.
The rear oxygen 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
After starting the engine, perform the diagnosis continuously when engine is low speed.
(A)
Battery voltage
(C)
256 milliseconds (cycles)
(D)
Low error
(B)
Output voltage of the rear oxygen
sensor heater
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Elapsed time after engine starting
t 1 second
Engine speed
< 8000 rpm
EN-01792
(C)
(A)
(B)
ON
OFF
0V
(D)
GD(H4DOTC)-21
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:8 ms × 320 time(s)
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: Less than 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Output voltage level
Low
Rear oxygen sensor heater control duty
< 75 %
Judgement Value
Malfunction Criteria
Threshold Value
Output voltage level
High
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