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