Subaru IMPREZA GD 2007 Series Manual page 647

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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 CONDITION
Malfunction Criteria
Engine speed
After engine starting
Ignition switch
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 or more
ON
> 10.9 V
ON
9.0 ←→ 51 2 (2.38
←→ 13.5 US gal, 2
←→ 11.2 Imp gal)
10 seconds or more
GD(H4SO)-154