Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 321
GD(H4DOTC)-36
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
X: DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT
1. OUTLINE OF DIAGNOSIS
Detect open or short circuits of the air flow 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)
Voltage (V)
(4)
Amount of intake air (kg (lb)/s)
(2)
Intake air temperature sensor
Secondary Parameters
Enable Conditions
None
EN-01766
(3)
(4)
(2)
(1)
(A)
GD(H4DOTC)-37
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: 500 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
Judgment Value
Malfunction Criteria
Threshold Value
Output voltage
≤ 0.22 V
Judgment Value
Malfunction Criteria
Threshold Value
Output voltage
> 0.22 V
GD(H4DOTC)-38
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Y: DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT HIGH INPUT
1. OUTLINE OF DIAGNOSIS
Detect open or short circuits of the air flow 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)
Voltage (V)
(4)
Amount of intake air (kg (lb)/s)
(2)
Intake air temperature sensor
Secondary Parameters
Enable Conditions
None
EN-01766
(3)
(4)
(2)
(1)
(A)
GD(H4DOTC)-39
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: 500 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
Judgment Value
Malfunction Criteria
Threshold Value
Output voltage
≥ 4.952 V
Judgment Value
Malfunction Criteria
Threshold Value
Output voltage
< 4.952 V
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