Subaru Legacy IV (2008 year). Service manual — part 631
GD(H6DO)-144
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CQ: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(H6DO)-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
GD(H6DO)-146
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
The diagnosis counter does not count up when the following conditions are completed within 12288 ms.
Time Needed for Diagnosis: 12288 ms × 4 time(s)
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: 12288 ms
Judgement Value
Malfunction Criteria
Threshold Value
Integrated times of the condition reaching
follows,
t 4 time(s)
DELFLMAX
t Value from Map
or
SUMFL
t 25.92 V
At this time,
DELFLMAX: Maximum difference of sen-
sor output for 12288 ms
SUMFL: Integrated value of the sensor
output deviation for12288 ms
Map
Fuel level (
2, US gal, Imp gal)
0, 0, 0
10, 2.64,
2.2
20, 5.28,
4.4
30, 7.93,
6.6
40, 10.57,
8.8
50, 13.21,
11
60, 15.85,
13.2
Measured voltage (V)
0.27
0.27
0.426
0.582
0.738
0.894
0.894
Maximum value – Minimum value of
change of tank pressure for 12288 ms
t 0 kPa (0.375031 mmHg,
0 inHg)
Maximum value – Minimum value of bat-
tery voltage for12288 ms
t 0.609 V
Judgement Value
Malfunction Criteria
Threshold Value
DELFLMAX
< Value from Map
SUMFL
< 25.92 V
At this time,
DELFLMAX: Maximum difference of sen-
sor output for 12288 ms
SUMFL: Integrated value of the sensor
output deviation for12288 ms
GD(H6DO)-147
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CR:DTC P0500 VEHICLE SPEED SENSOR “A”
1. OUTLINE OF DIAGNOSIS
Judge as NG when outside of the judgment value.
Judge NG when the received data from ABSCM&H/U is abnormal vehicle speed, and the vehicle speed data
is impossible.
2. COMPONENT DESCRIPTION
Vehicle speed signals are taken in to the ABS control module and hydraulic control unit, and normal/errone-
ous data of the ABS wheel speed sensor is received by CAN communication from the ABS control module
and hydraulic control unit.
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform diagnosis more than 2000 ms after starting the engine.
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: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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: 2500 ms
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Elapsed time after engine starting
t 2000 ms
Judgement Value
Malfunction Criteria
Threshold Value
Front ABS wheel speed sensor status
Malfunction
Either of the following is established
Front left wheel speed
t 300 km/h (186.4 MPH)
Front right wheel speed
t 300 km/h (186.4 MPH)
Judgement Value
Malfunction Criteria
Threshold Value
Front left wheel speed
> 0 km/h (0 MPH)
and
< 300 km/h (186.4 MPH)
Front right wheel speed
> 0 km/h (0 MPH)
and
< 300 km/h (186.4 MPH)
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