Subaru 2009 IMPREZA Service Manual page 1617

Diagnostic Trouble Code (DTC) Detecting Criteria
M: 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
(1)
(A)
(A) Air
(1) Air flow sensor
(2) Intake air temperature sensor
3. ENABLE CONDITIONS
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
Output voltage
Time Needed for Diagnosis: 500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Judgement Value
Malfunction Criteria
Output voltage
Time Needed for Diagnosis: Less than 1 second
(2)
(3) Voltage (V)
Enable Condition
Threshold Value
4.98 V
Threshold Value
< 4.98 V
GD(H4DOTC)-29
GENERAL DESCRIPTION
(3)
(4)
(4) Amount of intake air (kg (lb)/s)
EN-01766