Subaru Legacy IV (2008 year). Service manual — part 423
GD(H4DOTC)-142
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BX:DTC P0463 FUEL LEVEL SENSOR “A” CIRCUIT HIGH
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of fuel level sensor. Judge as NG if out of specification.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(1)
Engine control module (ECM)
(3)
Fuel sub level sensor
(4)
Detecting circuit
(2)
Fuel level sensor
(5)
Body integrated unit
Secondary Parameters
Enable Conditions
None
(5)
(4)
(1)
(2)
(3)
EN-05371
GD(H4DOTC)-143
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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.
Time Needed for Diagnosis: 1000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• 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.
Time Needed for Diagnosis: Less than 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Elapsed time after starting the engine
t 3000 ms
Output voltage
t 7.212 V
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Elapsed time after starting the engine
t 3000 ms
Output voltage
< 7.212 V
GD(H4DOTC)-144
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
3. GENERAL DRIVING CYCLE
• Always perform the diagnosis continuously at idle speed.
• Pay attention to the fuel level.
Malfunction Criteria
Threshold Value
Engine speed
t 500 rpm
Elapsed time after starting the engine
t 1 second
Battery voltage
t 10.9 V
Idle switch
ON
Fuel level
t 9.6
2 (2.54 US gal,
2.11 Imp gal)
and
<
54.4
2 (14.37 US gal,
11.97 Imp gal)
Vehicle speed = 0 km/h (0 MPH)
t 10000 ms
GD(H4DOTC)-145
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
4. DIAGNOSTIC METHOD
Calculate the Max. value (DELFLMAX) and cumulative value (SUMFL) of output voltage variation of fuel level
sensor during 12.2 seconds. Judge it normal when both max. and cumulative values are not over the thresh-
old value. Otherwise, when either of them is over the threshold value, the diagnosis counter counts up. Judge
as NG if the counter indicated 4 time(s).
(A)
12288 ms
(C)
Malfunction
(D)
Normal
(B)
NG at 4 time(s)
Diagnosis condition
Diagnosis timer
(A)
Fuel level sensor
A/D value
Amount of Fuel level
output voltage variation
Diagnosis counter
(B)
Calculate the Max. value (DELFLMAX)
and the cumulative value (SUMFL).
1
2
3
4
5
6
0
(C)
(D)
EN-05569
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