Subaru IMPREZA GD 2007 Series Manual page 1818

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Diagnostic Trouble Code (DTC) Detecting Criteria
L: 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
(1)
(A)
(1) Air flow sensor
(2) Intake air temperature sensor
3. ENABLE CONDITION
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
Judge as NG when the continuous time of meeting the malfunction criteria below becomes 0.5 seconds or
more. Judge as OK and clear the NG when the malfunction criteria below are not met.
Judgment Value
Malfunction Criteria
Output voltage
Time Needed for Diagnosis: 0.5 seconds
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONS
• When the OK driving cycle is completed three times in a row
• When "Clear Memory" is performed
(2)
(3) Voltage (V)
(4) Amount of intake air (kg/s)
Enable Conditions
Threshold Value
≤ 0.2 V
GD(H4DOTC)-27
GENERAL DESCRIPTION
(3)
(4)
(A) Air
EN-01766