Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 319
GD(H4DOTC)-28
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
T: 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 CONDITIONS
4. GENERAL DRIVING CYCLE
After starting the engine, perform the diagnosis continuously when engine is low speed.
(A)
Battery voltage
(B)
Output voltage of the rear oxygen
sensor heater
(C)
256 ms (cycles)
(D)
Low error
Secondary Parameters
Enable Conditions
Battery voltage
≥ 10.9 V
Elapsed time after engine starting
≥ 1 second
Engine speed
< 8000 rpm
EN-01792
(C)
(A)
(B)
ON
OFF
0V
(D)
GD(H4DOTC)-29
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: 8 ms × 1250 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: Less than 1 second
Judgment Value
Malfunction Criteria
Threshold Value
Output voltage level
Low
Rear oxygen sensor heater control duty
< 75 %
Judgment Value
Malfunction Criteria
Threshold Value
Output voltage level
High
GD(H4DOTC)-30
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
U: DTC P0038 HO2S HEATER CONTROL CIRCUIT HIGH (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 High.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
After starting the engine, perform the diagnosis continuously when engine is low speed.
(A)
Battery voltage
(B)
Output voltage of the rear oxygen
sensor heater
(C)
256 ms (cycles)
(D)
High error
Secondary Parameters
Enable Conditions
Battery voltage
≥ 10.9 V
Elapsed time after engine starting
≥ 1 second
Engine speed
< 8000 rpm
EN-01793
(C)
(A)
(B)
ON
OFF
0V
(D)
GD(H4DOTC)-31
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: 8 ms × 320 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: Less than 1 second
Judgment Value
Malfunction Criteria
Threshold Value
Output voltage level
High
Rear oxygen sensor heater control duty
≥ 25 %
Judgment Value
Malfunction Criteria
Threshold Value
Output voltage level
Low
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