Subaru 2009 IMPREZA Service Manual page 749

Diagnostic Trouble Code (DTC) Detecting Criteria
M: DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of air flow sensor output properties.
Judge as a low side NG when the air flow voltage indicates a small value regardless of running in a state
where the air flow voltage increases. Judge as a high side NG when the air flow voltage indicates a large val-
ue regardless of running in a state where the air flow voltage decreases. Judge air flow sensor property NG
when the Low side or High side becomes NG.
2. COMPONENT DESCRIPTION
(1)
(A)
(A) Air
(1) Air flow sensor
(2) Intake air temperature sensor
3. ENABLE CONDITIONS
Secondary Parameters
Engine coolant temperature
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after idling.
(2)
(3) Voltage (V)
Enable Condition
75 °C (167 °F)
GD(H4SO)-25
GENERAL DESCRIPTION
(3)
(4)
(4) Amount of intake air (kg (lb)/s)
EN-01766