Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 323

GD(H4DOTC)-44

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AB:DTC P0111 INTAKE AIR TEMPERATURE SENSOR RANGE/PERFORMANCE

PROBLEM

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of intake air temperature sensor output property.

Judge as NG when the intake air temperature is not varied whereas it seemed to be varied from the viewpoint

of engine condition.

2. COMPONENT DESCRIPTION

(A)

Air

(1)

Air flow sensor

(3)

Resistance value (Ω)

(4)

Intake air temperature °C (°F)

(2)

Intake air temperature sensor

EN-01767

(3)

(4)

(2)

(1)

(A)

GD(H4DOTC)-45

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Perform the diagnosis when the vehicle speed condition is met after warming up from a cold condition.

Secondary Parameters

Enable Conditions

Engine coolant temperature at engine starting

< 200 °C (392 °F)

Battery voltage

≥ 10.9 V

Continuous time when the vehicle speed is less than 200 km/h (124.3 MPH)

≥ 1 s

Engine coolant temperature

≥ 70 °C (158 °F)

Intake air amount sum value

≥ Value of Map 1

Number of experiences under conditions below

≥ 3 time(s)

• Continuous time when vehicle speed is less than 4 km/h (2.5 MPH)

≥ Value from Map 2

• Continuous time when vehicle speed is 40 km/h (24.9 MPH) or more

≥ 15 s

and

Establishing time of 1, 2

≥ 15 s

1. Intake air amount

≥ 15 g/s (0.53 oz/s)

2. Vehicle speed

≥ 4 km/h (2.5 MPH)

Map 1 (Models without SI-DRIVE)

Engine coolant temperature
°C (°F)

–20

(–4)

–10

(14)

0

(32)

10

(50)

20

(68)

Intake air amount sum value (g (oz))

76000

(2680.52)

10192

(359.47)

9028

(318.42)

7864

(277.36)

5800

(204.57)

Map 1 (Models with SI-DRIVE)

Engine coolant temperature
°C (°F)

–20

(–4)

–10

(14)

0

(32)

10

(50)

20

(68)

Intake air amount sum value (g (oz))

76000

(2680.52)

10192

(359.47)

9028

(318.42)

7864

(277.36)

6320

(222.91)

Map 2

Engine coolant temperature
°C (°F)

–20

(–4)

–10

(14)

5

(41)

20

(68)

Continuous time (s) when vehicle speed
is less than 4 km/h (2.5 MPH)

250

40

32

24

GD(H4DOTC)-46

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

• Abnormality Judgment
Judge as NG when the following conditions are established.

Time Needed for Diagnosis: Less than 1 second

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 following conditions are established.

Time Needed for Diagnosis: Less than 1 second

Judgment Value

Malfunction Criteria

Threshold Value

Output voltage difference between Max. and Min.

< 0.02 V(Equivalent to approximately 0.5°C (0.9°F) near 25°C)

Judgment Value

Malfunction Criteria

Threshold Value

Output voltage difference between Max. and Min.

≥ 0.02 V

GD(H4DOTC)-47

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AC:DTC P0112 INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

Detect open or short circuit of the intake air temperature sensor.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(A)

Air

(1)

Air flow sensor

(3)

Resistance value (Ω)

(4)

Intake air temperature °C (°F)

(2)

Intake air temperature sensor

Secondary Parameters

Enable Conditions

None

EN-01767

(3)

(4)

(2)

(1)

(A)