Subaru 2009 IMPREZA Service Manual page 1738

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BY:DTC P0464 FUEL LEVEL SENSOR CIRCUIT INTERMITTENT
1. OUTLINE OF DIAGNOSIS
Detect the unstable output faults from the fuel level sensor caused by noise. Judge as NG when the max. val-
ue and cumulative value of output voltage variation of the fuel level sensor is larger than the threshold value.
2. ENABLE CONDITION
Malfunction Criteria
Engine speed
Elapsed time after starting the engine
Battery voltage
Idle switch
Fuel level
Vehicle speed = 0 km/h (0 MPH)
3. GENERAL DRIVING CYCLE
• Always perform the diagnosis continuously at idle speed.
• Pay attention to the fuel level.
Threshold Value
500 rpm
1 second
10.9 V
ON
9.6 2 (2.54 US gal,
2.11 Imp gal)
and
< 54.4 2 (14.37 US gal,
11.97 Imp gal)
10000 ms
GD(H4DOTC)-150