Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 328

GD(H4DOTC)-64

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Perform the diagnosis only once after starting the engine.

Secondary Parameters

Enable Conditions

<Judgment 1>
Battery voltage

≥ 10.9 V

Estimate ambient temperature

≥ –7 °C (19.4 °F)

Vehicle speed

≥ 30 km/h (18.6 MPH)

Estimated coolant temperature

≥ Value of Map 1

<Judgment 2>
Battery voltage

≥ 10.9 V

Estimate ambient temperature

≥ –7 °C (19.4 °F)

Vehicle speed

≥ 30 km/h (18.6 MPH)

Estimated coolant temperature

≥ Value from Map 2

<Judgment 3>
Battery voltage

≥ 10.9 V

Estimate ambient temperature

≥ –7 °C (19.4 °F)

Vehicle speed

≥ 30 km/h (18.6 MPH)

Estimated coolant temperature

≥ Value from Map 3

Map 1

Engine coolant temperature at 
engine starting
°C (°F)

–7

(19.4)

8

(46.4)

10

(50)

25

(77)

Estimated coolant temperature
°C (°F)

70

(158)

70

(158)

70

(158)

70

(158)

Map 2 (Models without SI-DRIVE)

Engine coolant temperature at engine starting
°C (°F)

–7

(19.4)

8

(46.4)

10

(50)

25

(77)

Estimated coolant temperature
°C (°F)

75

(167)

75

(167)

75

(167)

75

(167)

Map 2 (Models with SI-DRIVE)

Engine coolant temperature at engine starting
°C (°F)

–7

(19.4)

8

(46.4)

10

(50)

25

(77)

Estimated coolant temperature
°C (°F)

77.5

(171.5)

77.5

(171.5)

77.5

(171.5)

77.5

(171.5)

Map 3 (Models without SI-DRIVE)

Engine coolant temperature at engine starting
°C (°F)

–7

(19.4)

10

(50)

25

(77)

27

(80.6)

Estimated coolant temperature
°C (°F)

58.1

(136.6)

66.6

(151.9)

74.2

(165.6)

75

(167)

Map 3 (Models with SI-DRIVE)

Engine coolant temperature at engine starting
°C (°F)

–7

(19.4)

10

(50)

25

(77)

46

(114.8)

Estimated coolant temperature
°C (°F)

59.8

(139.6)

65.5

(149.9)

70.5

(158.9)

77.5

(171.5)

GD(H4DOTC)-65

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.
Judgment Value

Malfunction Criteria

Threshold Value

When any one of the followings is established.
<Judgment 1>
Actual engine coolant temperature

< Value of Map 4

and

 

Σ (Estimated engine coolant temperature 
– actual engine coolant temperature)

> Value of Map 5

<Judgment 2>
Actual engine coolant temperature

< Regulated tempera-
ture – Value of Map 6

and

 

Σ (Estimated engine coolant temperature 
– actual engine coolant temperature)

> Value of Map 7

<Judgment 3>
Estimated engine coolant temperature – 
actual engine coolant temperature

> Value of Map 8

and

 

Σ (Estimated engine coolant temperature 
– actual engine coolant temperature)

> Value of Map 9

Map 4

Estimate ambient temperature
°C (°F)

–7

(19.4)

8

(46.4)

10

(50)

25

(77)

Threshold Value
°C (°F)

70

(158)

70

(158)

70

(158)

70

(158)

Map 5

Engine coolant temperature at 
engine starting
°C (°F)

–7

(19.4)

0

(32)

8

(46.4)

10

(50)

25

(77)

35

(95)

Threshold Value
°C (°F)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

1000

(1800)

Map 6

Estimate ambient temperature
°C (°F)

–7

(19.4)

8

(46.4)

10

(50)

25

(77)

Threshold Value
°C (°F)

11.1

(20)

11.1

(20)

11.1

(20)

11.1

(20)

Map 7

Engine coolant temperature at 
engine starting
°C (°F)

–7

(19.4)

0

(32)

8

(46.4)

10

(50)

25

(77)

30

(86)

35

(95)

Threshold Value
°C (°F)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

1200

(2160)

GD(H4DOTC)-66

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Time Needed for Diagnosis: 300 — 700 seconds

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: 300 — 700 seconds

Map 8

Estimate ambient temperature
°C (°F)

–7

(19.4)

8

(46.4)

10

(50)

25

(77)

Threshold Value
°C (°F)

11.1

(20)

11.1

(20)

11.1

(20)

11.1

(20)

Map 9

Engine coolant temperature at 
engine starting
°C (°F)

–7

(19.4)

8

(46.4)

10

(50)

25

(77)

Threshold Value
°C (°F)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

1731.6

(3116.9)

Judgment Value

Malfunction Criteria

Threshold Value

All of the following conditions are established.
<Judgment 1>
Actual engine coolant temperature

≥ Value of Map 4

and

 

Σ (Estimated engine coolant temperature 
– actual engine coolant temperature)

≤ Value of Map 5

<Judgment 2>
Actual engine coolant temperature

≥ Regulated tempera-
ture – Value of Map 6

and

 

Σ (Estimated engine coolant temperature 
– actual engine coolant temperature)

≤ Value of Map 7

<Judgment 3>
Estimated engine coolant temperature – 
actual engine coolant temperature

≤ Value of Map 8

and

 

Σ (Estimated engine coolant temperature 
– actual engine coolant temperature)

≤ Value of Map 9

and

 

Actual engine coolant temperature

≥ Regulated tempera-
ture – Value of Map 10

Map 10

Estimate ambient temperature
°C (°F)

–7

(19.4)

8

(46.4)

10

(50)

25

(77)

Threshold Value
°C (°F)

11.1

(20)

11.1

(20)

11.1

(20)

11.1

(20)

GD(H4DOTC)-67

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AL: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 CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(A)

Electromotive force

(B)

Air fuel ratio

(C)

Rich

(D)

Lean

 

 

 

 

 

 

 

 

 

 

(1)

Exhaust gas

(2)

ZrO

2

 

 

Secondary Parameters

Enable Conditions

Battery voltage

≥ 10.9 V

EN-09361

(C)

(B)

(D)

(A)

(2)

(1)

(1)