Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 356
GD(H4DOTC)-176
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CY:DTC P0463 FUEL LEVEL SENSOR “A” CIRCUIT HIGH
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of fuel level sensor. Judge as NG if out of specification.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(1)
Engine control module (ECM)
(3)
Fuel sub level sensor
(5)
Body integrated unit
(2)
Fuel level sensor
(4)
Detecting circuit
Secondary Parameters
Enable Conditions
None
(5)
(4)
(1)
(2)
(3)
EN-05371
GD(H4DOTC)-177
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: 1000 ms
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: Less than 1 second
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 3000 ms
Output voltage
≥ 7.212 V
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 3000 ms
Output voltage
< 7.212 V
GD(H4DOTC)-178
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CZ:DTC P04AC EVAP SYSTEM PURGE CONTROL VALVE "B" CIRCUIT LOW
1. OUTLINE OF DIAGNOSIS
Detect open or short circuit of the purge control solenoid valve 2.
Judge as NG when the ECM output level differs from the actual terminal level.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. 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 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: Less than 1 second
Secondary Parameters
Enable Conditions
None
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 1 s
Terminal output voltage when ECM outputs OFF signal
Low
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 1 s
Terminal output voltage when ECM outputs OFF signal
High
GD(H4DOTC)-179
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DA:DTC P04AD EVAP SYSTEM PURGE CONTROL VALVE "B" CIRCUIT HIGH
1. OUTLINE OF DIAGNOSIS
Detect open or short circuit of the purge control solenoid valve 2.
Judge as NG when the ECM output level differs from the actual terminal level.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. 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 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: Less than 1 second
Secondary Parameters
Enable Conditions
None
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 1 s
Terminal output voltage when ECM outputs ON signal
High
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 1 s
Terminal output voltage when ECM outputs ON signal
Low
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