Subaru Legacy IV (2008 year). Manual - part 99

SC(H4SO)-20

Battery

STARTING/CHARGING SYSTEMS

4. Battery

A: REMOVAL

1) Disconnect the positive (+) terminal after discon-
necting the negative (–) terminal of battery.
2) Remove the harness clip of the negative termi-
nal from the battery rod.
3) Remove the flange nut from battery rod and re-
move battery holder.

4) Remove the battery.

B: INSTALLATION

Install in the reverse order of removal.

Tightening torque:

3.5 N·m (0.4 kgf-m, 2.6 ft-lb)

NOTE:
• Clean the battery cable terminals and apply
grease to retard the formation of corrosion.
• Connect the battery positive (+) terminal, and
then connect the negative (–) terminal.
• After the battery is installed, initial diagnosis of
the electronic throttle control is performed. Wait for
10 seconds or more after turning the ignition switch
to ON, and then start the engine.

C: INSPECTION

WARNING:
• Electrolyte is corrosive acid, and has toxici-
ty; be careful of handling the fluid.
• Make sure the electrode does not come into
contact with skin, eyes or clothing. Especially
at contact with eyes, flush with water for 15
minutes and get prompt medical attention.
• In addition, be careful not to let the electrode
contact with the coated parts.
• Be careful when handling the batteries be-
cause they produce explosive gases.
• Be sure to keep battery away from any fire.
• For safety, in case an explosion does occur,
wear eye protection or shield your eyes when
working near any battery. In addition, never
lean over the battery.
• Ventilate sufficiently when using or charging
battery in enclosed space.
• Before starting work, remove rings, metal
watch-bands, and other metal jewelry.
• Never allow metal tools to contact the posi-
tive battery terminal and anything connected to
it while you are at the same time in contact with
any other metallic portion of the vehicle.

1. EXTERNAL PARTS

Check the battery case, top cover, vent plugs, and
terminal posts for dirt or cracks. If necessary, clean
with water and wipe with a dry cloth.
Apply a thin coat of grease on the terminal posts to
prevent corrosion.

2. ELECTROLYTE LEVEL

Check the electrolyte level in each cell. If the level
is below MIN level, bring the level to MAX level by
pouring distilled water into the battery cell. Do not
fill beyond MAX level.

SC-02238

SC(H4SO)-21

Battery

STARTING/CHARGING SYSTEMS

3. SPECIFIC GRAVITY OF ELECTROLYTE

1) Measure specific gravity of electrolyte using a
hydrometer and a thermometer.
Specific gravity varies with temperature of electro-
lyte so that it must be corrected at 20°C (68°F) us-
ing the following equation:

= St + 0.0007 × (t – 20)

: Specific gravity corrected at electrolyte

temperature of 20°C (68°F)
St: Measured specific gravity
t: Measured temperature (°C)
Determine whether or not battery must be
charged, according to corrected specific
gravity.
Standard specific gravity: 1.220 — 1.290
[20°C (68°F)]

2) Measuring the specific gravity of the electrolyte
in the battery will disclose the state of charge of the
battery. The relation between specific gravity and
state of charge is as shown in the figure.

D: MEASUREMENT

WARNING:
Do not bring an open flame close to the battery
when working.

CAUTION:
• Prior to charging, corroded terminals should
be cleaned with a brush and common caustic
soda solution.
• Be careful since battery electrolyte overflows
while charging the battery.
• Observe instructions when handling the bat-
tery charger.
• Before charging the battery on the vehicle,
disconnect the battery ground terminal to pre-
vent damage of generator diodes or other elec-
trical units.

1. JUDGMENT OF BATTERY IN CHARGED
CONDITION

1) Specific gravity of electrolyte should be held
within the specific range from 1.250 to 1.290 for
one hour or more.
2) Voltage per battery cell should be held at a spe-
cific value in a range from 2.5 to 2.8 V for one hour
or more.

2. CHECK CONDITION OF CHARGE WITH
HYDROMETER

3. NORMAL CHARGING

Charge the battery at the current value specified by
manufacturer or at approximately 1/10 of battery’s
ampere-hour rating.

SC-00054

100

1.12

1.20

1.16

1.24

1.28

1.22

1.08

1.04

Amount of discharge (%)

Specific gravity 20 ( C)

Battery with standard specific gravity 1,280 (20 C)

Good

Need to charge

Hydrometer

indicator

State of

charge

Corrective action

Green dot

65% or more

Load test

Dark dot

65% or less

Charge battery

Clear dot

Low

electrolyte

Replace the battery.*

(If cranking is difficult)

* Check electrical system before replacement.

SC(H4SO)-22

Battery

STARTING/CHARGING SYSTEMS

4. QUICK CHARGING

Quick charging is a method that the battery is
charged in a short period of time with a relatively
large current by using a quick charger.
Since a large current flow raises electrolyte temper-
ature, the battery is subject to damage if the large
current is used for prolonged time. For this reason,
the quick charging must be carried out within a cur-
rent range that will not increase the electrolyte tem-
perature above 40°C (104°F).
Also the quick charging is a temporary mean to
bring battery voltage up to some level, and battery
should be charged slowly with low current as a rule.

CAUTION:
• Observe the items in 3. NORMAL CHARGING.
• Never use 10 A or more when charging the
battery because it will shorten the battery life.

EN(H4SO)(diag)-2

Basic Diagnostic Procedure

ENGINE (DIAGNOSTICS)

1. Basic Diagnostic Procedure

A: PROCEDURE

1. ENGINE

Step

Check

Yes

CHECK ENGINE START FAILURE.
1) Ask the customer when and how the trouble
occurred using the interview checklist. <Ref. to
EN(H4SO)(diag)-3, CHECK, Check List for
Interview.>
2) Start the engine.

Does the engine start?

Go to step 2.

Inspection using
Diagnostics for
Engine Start Fail-
ure. <Ref. to
EN(H4SO)(diag)-
64, Diagnostics for
Engine Starting
Failure.>

CHECK ILLUMINATION OF MALFUNCTION
INDICATOR LIGHT.

Does the malfunction indicator
light illuminate?

Go to step 3.

Inspection using
“General Diagnos-
tic Table” <Ref. to
EN(H4SO)(diag)-
300, INSPEC-
TION, General
Diagnostic Table.>

CHECK THE COMMUNICATION STATUS.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor or gen-
eral scan tool to the data link connector.
3) Turn the ignition switch to ON, and run the
Subaru Select Monitor or general scan tool.

NOTE:
• SUBARU SELECT MONITOR
For detailed procedures, refer to “Subaru Select
Monitor”. <Ref. to EN(H4SO)(diag)-33, Subaru
Select Monitor.>
• General Scan Tool
For detailed operation procedures, refer to the
general scan tool operation manual.

Does Subaru select monitor or
general scan tool communicate
with vehicle normally?

Go to step 4.

Inspection using
“Diagnostics Pro-
cedure for Subaru
Select Monitor
Communication”.
<Ref. to
EN(H4SO)(diag)-
78, Diagnostic Pro-
cedure for Subaru
Select Monitor
Communication.>

CHECK DTC.
Read DTC using Subaru Select Monitor or gen-
eral scan tool.

NOTE:
• SUBARU SELECT MONITOR
Refer to “Read Diagnostic Trouble Code” for
detailed operation procedure. <Ref. to
EN(H4SO)(diag)-40, Read Diagnostic Trouble
Code (DTC).>
• General Scan Tool
For detailed operation procedures, refer to the
general scan tool operation manual.

Is DTC displayed on the Subaru
Select Monitor or general scan
tool?

Record the DTC.
Repair the trouble
cause. <Ref. to
EN(H4SO)(diag)-
80, List of Diagnos-
tic Trouble Code
(DTC).>
Go to step 5.

Repair the related
parts.

NOTE:
If DTC is not shown
on display although
the malfunction in-
dicator light illumi-
nates, perform the
diagnosis of mal-
function indicator
light circuit or combi-
nation meter. <Ref.
to EN(H4SO)(di-
ag)-55, Malfunction
Indicator Light.>

PERFORM DIAGNOSIS.
1) Perform the Clear Memory Mode. <Ref. to
EN(H4SO)(diag)-50, Clear Memory Mode.>
2) Perform the Inspection Mode. <Ref. to
EN(H4SO)(diag)-41, Inspection Mode.>

Is DTC displayed on the Subaru
Select Monitor or general scan
tool?

Inspect using
“Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC)”<Ref. to
EN(H4SO)(diag)-
87, Diagnostic Pro-
cedure with Diag-
nostic Trouble
Code (DTC).>

Finish the diagno-
sis.

Content .. 97 98 99 100 ..