Subaru Legacy IV (2008 year). Manual — part 1093

IDI-13

Combination Meter System

INSTRUMENTATION/DRIVER INFO

8. CHECK FUEL LEVEL SENSOR

Step

Check

Yes

No

1

CHECK COMBINATION METER.
Check combination meter fuel gauge indication
status.

Does the fuel gauge indicate
EMPTY or is the remaining fuel
or similar warning light blink-
ing?

Go to step 4.

Go to step 2.

2

CHECK COMBINATION METER.
Perform the self-diagnosis of combination
meter. <Ref. to IDI-5, SELF-DIAGNOSIS,
INSPECTION, Combination Meter System.>

Is operation normal?

Go to step 3.

Replace the meter
case assembly.
<Ref. to IDI-22,
Combination
Meter.>

3

CHECK THE COMMUNICATION STATUS.
1) Prepare the Subaru Select Monitor kit.
2) Turn the ignition switch to ON (engine OFF)
and run the “PC application for Subaru Select
Monitor”.
3) Read the DTC of body integrated unit using
Subaru Select Monitor. <Ref. to LAN(diag)-12,
OPERATION, Subaru Select Monitor.>

Is a DTC detected?

Perform the diag-
nosis according to
DTC. <Ref. to
LAN(diag)-31,
LIST, List of Diag-
nostic Trouble
Code (DTC).>

Go to step 4.

4

CHECK HARNESS.
1) Disconnect the harness connector of body
integrated unit.
2) Measure the resistance between body inte-
grated unit harness connector terminal and
chassis ground.

Connector & terminal

(B281) No. 19 — Chassis ground:

Is the resistance less than 2 —
96

:?

Go to step 5.
When “Yes” was
chosen in step 1,
Go to step 9.

Repair the wiring
harness.

5

CHECK COMMUNICATION BETWEEN
BODY INTEGRATED UNIT AND METERS.
1) Remove the fuel sub level sensor.
<Ref. to FU(H4SO)-58, REMOVAL, Fuel Sub
Level Sensor.>
<Ref. to FU(H4DOTC)-73, REMOVAL, Fuel
Sub Level Sensor.>
<Ref. to FU(H6DO)-58, REMOVAL, Fuel Sub
Level Sensor.>
2) Using suitable lead wires and a resister of
approx. 100

:, short circuit the fuel sub level

sensor connector to the chassis ground.
3) Turn the ignition switch to ON.

Terminals

(R59) No. 1 — Chassis ground:

Does the meter needle indicate
EMPTY?

Go to step 7.

Go to step 6.

6

CHECK BODY INTEGRATED UNIT.
Under the same conditions as step 5, read the
data of “Fuel level resistance” of the body inte-
grated unit using the Subaru Select Monitor.
<Ref. to LAN(diag)-12, OPERATION, Subaru
Select Monitor.>

Is the data displayed as 100

:? Go to step 11.

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

IDI-14

Combination Meter System

INSTRUMENTATION/DRIVER INFO

7

CHECK COMMUNICATION BETWEEN
BODY INTEGRATED UNIT AND METERS.
1) Remove the fuel sub level sensor.
<Ref. to FU(H4SO)-58, REMOVAL, Fuel Sub
Level Sensor.>
<Ref. to FU(H4DOTC)-73, REMOVAL, Fuel
Sub Level Sensor.>
<Ref. to FU(H6DO)-58, REMOVAL, Fuel Sub
Level Sensor.>
2) Short the fuel sub level sensor connector
terminal to the chassis ground using a suitable
lead line wire with 2 — 6

: resistance con-

nected between connector terminal and chas-
sis ground.
3) Turn the ignition switch to ON.

Terminals

(R59) No. 1 — Chassis ground:

Does the meter needle indicate
FULL?

Go to step 9.

Go to step 8.

8

CHECK BODY INTEGRATED UNIT.
Under the same conditions as step 7, read the
data of “Fuel level resistance” of the body inte-
grated unit using the Subaru Select Monitor.
<Ref. to LAN(diag)-12, OPERATION, Subaru
Select Monitor.>

Is it approximately 2 — 6

:?

Go to step 11.

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

9

CHECK FUEL SUB LEVEL SENSOR.
1) Remove the fuel sub level sensor.
<Ref. to FU(H4SO)-58, REMOVAL, Fuel Sub
Level Sensor.>
<Ref. to FU(H4DOTC)-73, REMOVAL, Fuel
Sub Level Sensor.>
<Ref. to FU(H6DO)-58, REMOVAL, Fuel Sub
Level Sensor.>
2) Measure the resistance between fuel sub
level sensor connector terminals when the float
is in FULL or EMPTY position.

Connector & terminal

(R59) No. 1 — No. 2:

Is the resistance 1.0 — 3.0

:

(FULL), and 61 — 63

:

(EMPTY)?

Go to step 10.

Replace the fuel
sub level sensor.

10

CHECK FUEL LEVEL SENSOR.
1) Remove the fuel level sensor.
<Ref. to FU(H4SO)-57, REMOVAL, Fuel Level
Sensor.>
<Ref. to FU(H4DOTC)-72, REMOVAL, Fuel
Level Sensor.>
<Ref. to FU(H6DO)-57, REMOVAL, Fuel Level
Sensor.>
2) Measure the resistance between fuel level
sensor connector terminals when the float is in
FULL or EMPTY position.

Connector & terminal

(R58) No. 1 — No. 4:

Is the resistance 1.0 — 3.0

:

(FULL), and 31 — 33

:

(EMPTY)?

Check connection
status of the har-
ness and connec-
tor that may have a
temporary poor
contact.

Replace the fuel
level sensor.

11

CHECK COMBINATION METER OPERA-
TION.
1) Remove the combination meter.
2) Install the combination meter to another
vehicle with a normally operating fuel meter and
check meter operation.

Is the fuel meter OK?

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

Replace the meter
case assembly.

Step

Check

Yes

No

IDI-15

Combination Meter System

INSTRUMENTATION/DRIVER INFO

9. CHECK ENGINE COOLANT TEMPERATURE SENSOR

10.CHECK ECO GAUGE

11.CHECK AMBIENT SENSOR

Step

Check

Yes

No

1

CHECK COMMUNICATION ERROR DIS-
PLAY.
1) Turn the ignition switch to ON.
2) Check that the error code is displayed in
odo/trip meter. (Except for meter with MID)

Is the error code “Er xx” dis-
played on odo/trip meter?

Check the commu-
nication circuit.
<Ref. to IDI-17,
COMMUNICA-
TION ERROR DIS-
PLAY,
INSPECTION,
Combination Meter
System.>

Go to step 2.

2

CHECK ENGINE COOLANT TEMPERATURE
SENSOR.
Check the engine coolant temperature sensor.
<Ref. to EN(H4SO)(diag)-2, Basic Diagnostic
Procedure.> <Ref. to EN(H4DOTC)(diag)-2,
Basic Diagnostic Procedure.> <Ref. to
EN(H6DO)(diag)-2, Basic Diagnostic Proce-
dure.>

Is the engine coolant tempera-
ture sensor OK?

Replace the meter
case assembly.
<Ref. to IDI-22,
Combination
Meter.>

Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4SO)-22,
Engine Coolant
Temperature Sen-
sor.> <Ref. to
FU(H4DOTC)-31,
Engine Coolant
Temperature Sen-
sor.> <Ref. to
FU(H6DO)-20,
Engine Coolant
Temperature Sen-
sor.>

Step

Check

Yes

No

1

CHECK THE COMMUNICATION STATUS.
1) Connect the Subaru Select Monitor, and
turn the ignition switch and the Subaru Select
Monitor to ON.
2) Read the DTC of the body integrated unit.
<Ref. to LAN(diag)-12, OPERATION, Subaru
Select Monitor.>

Is a DTC of low-speed CAN
detected? <Ref. to LAN(diag)-
31, LIST, List of Diagnostic
Trouble Code (DTC).>

Perform the diag-
nosis according to
DTC. <Ref. to
LAN(diag)-31,
LIST, List of Diag-
nostic Trouble
Code (DTC).>

Go to step 2.

2

CHECK ECO GAUGE.
Perform the self-diagnosis of combination
meter (multi-information display). <Ref. to IDI-5,
SELF-DIAGNOSIS, INSPECTION, Combina-
tion Meter System.>

Does the ECO gauge operate
normally when self-diagnosis of
combination meter is per-
formed?

Temporary poor
contact occurs.

Replace the meter
case assembly.
<Ref. to IDI-22,
Combination
Meter.>

Step

Check

Yes

No

1

CHECK BODY INTEGRATED UNIT.
1) Prepare the Subaru Select Monitor kit.
2) Turn the ignition switch to ON (engine OFF)
and run the “PC application for Subaru Select
Monitor”.
3) Read the DTC of body integrated unit using
Subaru Select Monitor. <Ref. to LAN(diag)-12,
OPERATION, Subaru Select Monitor.>

Is DTC displayed? <Ref. to
LAN(diag)-31, LIST, List of
Diagnostic Trouble Code
(DTC).>

Repair it according
to the DTC. <Ref.
to LAN(diag)-31,
LIST, List of Diag-
nostic Trouble
Code (DTC).>

Go to step 2.

IDI-16

Combination Meter System

INSTRUMENTATION/DRIVER INFO

2

CHECK BODY INTEGRATED UNIT.
1) Start the engine, and set the vehicle speed
at 20 km/h (12 MPH) or more.
2) Read the “Front Wheel Speed” of the body
integrated unit using Subaru Select Monitor.
<Ref. to LAN(diag)-12, OPERATION, Subaru
Select Monitor.>

Is the data displayed as
999.9 km/h?

Check the follow-
ing items.
• LAN system
<Ref. to
LAN(diag)-65,
DTC U1223 CAN-
HS VDC/ABS NO-
RECEIVE DATA,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
• VDC
<Ref. to
VDC(diag)-2,
Basic Diagnostic
Procedure.>
• ABS
<Ref. to
ABS(diag)-2, Basic
Diagnostic Proce-
dure.>

Go to step 3.

3

CHECK BODY INTEGRATED UNIT.
Read the “front wheel speed” of the body inte-
grated unit using Subaru Select Monitor. <Ref.
to LAN(diag)-12, OPERATION, Subaru Select
Monitor.>

Is the vehicle speed displayed
correctly?

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

Go to step 4.

4

CHECK AMBIENT SENSOR.
Blow hot air at the ambient sensor, and read the
voltage of ambient sensor using Subaru Select
Monitor. <Ref. to LAN(diag)-12, OPERATION,
Subaru Select Monitor.>

Does the voltage change?

Go to step 8.

Go to step 5.

5

CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the body
integrated unit and the ambient sensor.
3) Measure the resistance of harness between
body integrated unit connector and ambient
sensor connector.

Connector & terminal

(B281) No. 10 — (F78) No. 1:
(B281) No. 3 — (F78) No. 2:

Is the resistance less than 1

:? Go to step 6.

Repair the open
circuit of harness.

6

CHECK HARNESS.
Measure the resistance between body inte-
grated unit connector and chassis ground.

Connector & terminal

(B281) No. 10 — Chassis ground:
(B281) No. 3 — Chassis ground:

Is the resistance less than 1 M

:? Go to step 7.

Repair the short
circuit of harness.

7

CHECK AMBIENT SENSOR.
Blow hot air at the ambient sensor, and read the
resistance between ambient sensor terminals.

Terminals

No. 1 — No. 2:

Does the resistance change?

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

Replace the ambi-
ent sensor.

8

CHECK AMBIENT SENSOR.
Blow cold air at the ambient sensor, and read
the ambient temperature using Subaru Select
Monitor. <Ref. to LAN(diag)-12, OPERATION,
Subaru Select Monitor.>

Does the temperature change
(at lower temperatures)?

Replace the meter
case assembly.
<Ref. to IDI-22,
Combination
Meter.>

Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>

Step

Check

Yes

No