Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 381

GD(H4DOTC)-276

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FK:DTC P2401 EVAPORATIVE EMISSION SYSTEM LEAK DETECTION PUMP

CONTROL CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of the ELCM vacuum pump.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

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: 2500 ms

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

(1)

ELCM

(5)

Vacuum pump

(9)

Fuel tank

(2)

Switching valve

(6)

Drain filter

(10) Canister

(3)

Reference orifice (0.02 inch ori-
fice)

(7)

Purge control solenoid valve

(4)

Pressure sensor

(8)

Intake manifold

Secondary Parameters

Enable Conditions

None

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9

Terminal output voltage when ECM outputs OFF signal Low

EN-08957

M

(10)

(8)

(6)

(5)

(2)

(3)

(4)

(1)

(7)

(9)

GD(H4DOTC)-277

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

• 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

Battery voltage

≥ 10.9

Terminal output voltage when ECM outputs OFF signal High

GD(H4DOTC)-278

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FL:DTC P2402 EVAPORATIVE EMISSION SYSTEM LEAK DETECTION PUMP

CONTROL CIRCUIT HIGH

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of the ELCM vacuum pump.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(1)

ELCM

(5)

Vacuum pump

(9)

Fuel tank

(2)

Switching valve

(6)

Drain filter

(10) Canister

(3)

Reference orifice (0.02 inch ori-
fice)

(7)

Purge control solenoid valve

(4)

Pressure sensor

(8)

Intake manifold

Secondary Parameters

Enable Conditions

None

EN-08957

M

(10)

(8)

(6)

(5)

(2)

(3)

(4)

(1)

(7)

(9)

GD(H4DOTC)-279

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: 2500 ms

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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

FM:DTC P2404 EVAPORATIVE EMISSION SYSTEM LEAK DETECTION PUMP

SENSE CIRCUIT RANGE/PERFORMANCE

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0455. <Ref. to GD(H4DOTC)-161, DTC P0455 EVAPORATIVE

EMISSION SYSTEM LEAK DETECTED (LARGE LEAK), Diagnostic Trouble Code (DTC) Detecting Crite-

ria.>

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9

Terminal output voltage when ECM outputs ON signal

High

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9

Terminal output voltage when ECM outputs ON signal

Low