Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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-
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
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