Subaru Legacy IV (2008 year). Service manual — part 406

GD(H4DOTC)-74

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AO:DTC P0230 FUEL PUMP PRIMARY CIRCUIT

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of fuel pump control unit.
Judge as NG when the NG signal is sent through a diagnostic line coming from the fuel pump control unit.
Fuel pump control unit detects the open or short circuit malfunction for each line, and then sends NG signals
if one of them is found NG.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(1)

Engine control module (ECM)

(3)

Fuel pump

(4)

Battery

(2)

Fuel pump control unit

Secondary Parameters

Enable Conditions

None

EN-01771

E

E

(3)

(4)

(2)

FPC

DI

FP+

FP-

+B

(1)

GD(H4DOTC)-75

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: 2500 ms
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

Battery voltage

t 8 V

Elapsed time after starting the engine

t 180000 ms

Fuel pump control

ON

Fuel pump control unit output diagnosis
signal

Low

Fuel level

t 10

2 (2.64 US gal,

2.2 Imp gal)

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 8 V

Elapsed time after starting the engine

t 180000 ms

Fuel pump control

ON

Fuel pump control unit output diagnosis
signal

High

Fuel level

t 10

2 (2.64 US gal,

2.2 Imp gal)

GD(H4DOTC)-76

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AP:DTC P0244 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A”

RANGE/PERFORMANCE

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of wastegate control solenoid valve function.
Judge as NG when becoming high wastegate pressure.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(1)

Coil

Secondary Parameters

Enable Conditions

None

EN-01772

(1)

GD(H4DOTC)-77

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: 2000 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

Intake manifold pressure

t Value from Map

Map

Pa (kPa (mmHg, inHg))

58.7 kPa

(440 mmHg,

17.3 inHg)

77.3 kPa

(580 mmHg,

22.8 inHg)

89.3 kPa

(670 mmHg,

26.4 inHg)

96 kPa

(720 mmHg,

28.3 inHg)

98.6 kPa

(740 mmHg,

29.1 inHg)

101.3 kPa

(760 mmHg,

29.9 inHg)

Abnormal threshold
(kPa (mmHg, inHg))

143.4 kPa

(1076 mmHg,

42.4 inHg)

172.6 kPa

(1295 mmHg,

51 inHg)

204.5 kPa

(1534 mmHg,

60.4 inHg)

216.2 kPa

(1622 mmHg,

63.9 inHg)

221.3 kPa

(1660 mmHg,

65.4 inHg)

221.3 kPa

(1660 mmHg,

65.4 inHg)

Judgement Value

Malfunction Criteria

Threshold Value

Intake manifold pressure

< Value from Map – 22.4 kPa
(168 mmHg, 6.6 inHg)