Subaru 2009 IMPREZA Service Manual page 859

Diagnostic Trouble Code (DTC) Detecting Criteria
BS: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 CONDITIONS
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(H4SO)-135
GENERAL DESCRIPTION