Subaru Legacy IV (2008 year). Manual — part 186

GD(H4SO)-46

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AB:DTC P0131 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 1)

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of sensor.
Judge as NG, when the element voltage is out of the specified range.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(A)

Electromotive force

(C)

Lean

(D)

Rich

(B)

Air fuel ratio

(1)

Atmosphere

(3)

ZrO

2

(4)

Ceramic heater

(2)

Exhaust gas

Secondary Parameters

Enable Conditions

Battery voltage

t 10.9 V

(1)

(2)

(4)

(2)

(3)

EN-01693

(C)

(B)

(D)

(A)

GD(H4SO)-47

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:
Input voltage (+): 1000 ms
Input voltage (–): 1000 ms
|Input voltage (+) – Input voltage (–)|: 1000 ms
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

Input voltage (+)

< 1.128 V

or

Input voltage (–)

< 0.23 V

or

|Input voltage (+) – Input voltage (–)|

< 0.644 V

Judgement Value

Malfunction Criteria

Threshold Value

Input voltage (+)

t 1.128 V

Input voltage (–)

t 0.23 V

|Input voltage (+) – Input voltage (–)|

t 0.644 V

GD(H4SO)-48

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AC:DTC P0132 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 1)

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of sensor.
Judge as NG, when the element voltage is out of the specified range.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(A)

Electromotive force

(C)

Lean

(D)

Rich

(B)

Air fuel ratio

(1)

Atmosphere

(3)

ZrO

2

(4)

Ceramic heater

(2)

Exhaust gas

Secondary Parameters

Enable Conditions

Battery voltage

t 10.9 V

(1)

(2)

(4)

(2)

(3)

EN-01693

(C)

(B)

(D)

(A)

GD(H4SO)-49

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:
Input voltage (+): 1000 ms
Input voltage (–): 1000 ms
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

Input voltage (+)

> 3.589 V

or

Input voltage (–)

> 3.541 V

Judgement Value

Malfunction Criteria

Threshold Value

Input voltage (+)

d 3.589 V

Input voltage (–)

d 3.541 V