Subaru Legacy IV (2008 year). Manual - part 572

EN(H6DO)(diag)-261

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

CN:DTC P0461 FUEL LEVEL SENSOR “A” CIRCUIT RANGE/PERFORMANCE

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-138, DTC P0461 FUEL LEVEL SENSOR “A” CIRCUIT
RANGE/PERFORMANCE, Diagnostic Trouble Code (DTC) Detecting Criteria.>

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.

CO:DTC P0462 FUEL LEVEL SENSOR “A” CIRCUIT LOW

NOTE:
For the diagnostic procedure, refer to DTC P0463. <Ref. to EN(H6DO)(diag)-261, DTC P0463 FUEL LEVEL
SENSOR “A” CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

CP:DTC P0463 FUEL LEVEL SENSOR “A” CIRCUIT HIGH

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-142, DTC P0463 FUEL LEVEL SENSOR “A” CIRCUIT
HIGH, Diagnostic Trouble Code (DTC) Detecting Criteria.>

Step

Check

Yes

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check the appro-
priate DTC using
the “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>

Replace the fuel
level sensor and
fuel sub level sen-
sor. <Ref. to
FU(H6DO)-57,
Fuel Level Sen-
sor.> <Ref. to
FU(H6DO)-58,
Fuel Sub Level
Sensor.>

Step

Check

Yes

CHECK FOR ANY OTHER DTC ON DISPLAY. Is DTC P0462 or P0463 dis-

played on the Subaru Select
Monitor?

Check the combi-
nation meter. <Ref.
to IDI-5, INSPEC-
TION, Combina-
tion Meter
System.>

Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.

NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.

EN(H6DO)(diag)-262

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

CQ:DTC P0464 FUEL LEVEL SENSOR CIRCUIT INTERMITTENT

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-144, DTC P0464 FUEL LEVEL SENSOR CIRCUIT IN-
TERMITTENT, Diagnostic Trouble Code (DTC) Detecting Criteria.>

CR:DTC P0500 VEHICLE SPEED SENSOR “A”

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-147, DTC P0500 VEHICLE SPEED SENSOR “A”, Diag-
nostic Trouble Code (DTC) Detecting Criteria.>

Step

Check

Yes

CHECK FOR ANY OTHER DTC ON DISPLAY. Is DTC P0464 displayed on the

display?

Check the combi-
nation meter. <Ref.
to IDI-5, INSPEC-
TION, Combina-
tion Meter
System.>

Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.

NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.

Step

Check

Yes

CHECK DTC OF VDC.
Check DTC of VDC.

Is DTC of VDC displayed?

Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-34, List
of Diagnostic Trou-
ble Code (DTC).>

Repair the poor
contact of ECM
connector.

EN(H6DO)(diag)-263

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

CS:DTC P0506 IDLE AIR CONTROL SYSTEM RPM LOWER THAN EXPECTED

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-148, DTC P0506 IDLE AIR CONTROL SYSTEM RPM
LOWER THAN EXPECTED, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Hard to start the engine.
• Engine does not start.
• Improper idling
• Engine stalls.

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

B20

1 2 3 4 5 6

E57

1 2 3 4
5 6 7 8

B122

1 2

7 8

3
4

5
6

B362

B21

C21

A29

B20

A18

A28

B122

A19

E57

ELECTRONIC THROTTLE

CONTROL

B134

B362

B137

B136

ECM

: TERMINAL No. OPTIONAL ARRANGEMENT

SBF-7

BATTERY

ELECTRONIC
THROTTLE
CONTROL RELAY

MAIN RELAY

B47

EN-06873

10 11 12 13 14 15

17 18 19 20
28

21 22 23

33 34 35

B136

22 23

11 12 13 14 15

24 25

16 17

18 19 20 21

28 29

30 31

B137

22 23

11 12 13 14 15

26 27

16 17

18 19 20 21

33 34

30 31

B134

B21

1 2 3 4 5 6 7 8 9 10 11

12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33

EN(H6DO)(diag)-264

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check the appro-
priate DTC using
the “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>

Go to step 2.

CHECK AIR CLEANER ELEMENT.
1) Turn the ignition switch to OFF.
2) Check the air cleaner element.

Is the air cleaner element
excessively clogged?

Replace the air
cleaner element.
<Ref. to
IN(H6DO)-4, Air
Cleaner Element.>

Go to step 3.

CHECK ELECTRONIC THROTTLE CON-
TROL.
1) Remove the electronic throttle control.
2) Check the electronic throttle control.

Are foreign matter found inside
electronic throttle control?

Remove foreign
matter from elec-
tronic throttle con-
trol.

Perform the diag-
nosis of DTC
P2101. <Ref. to
EN(H6DO)(diag)-
324, DTC P2101
THROTTLE
ACTUATOR CON-
TROL MOTOR
CIRCUIT RANGE/
PERFORMANCE,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>

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