Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 118

SC(STI)-28

Battery

STARTING/CHARGING SYSTEMS

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 of 1.250 — 1.290 for one

hour or more.

2) Voltage per battery cell should be held at a spe-

cific value in a range of 2.5 — 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.

4. QUICK CHARGING

CAUTION:

• Observe the items in “3. NORMAL CHARG-

ING”.

• Never use 10 A or more when charging the

battery because it will shorten the battery life.

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,

quick charging must be carried out within a current

range that will not raise the electrolyte temperature

to 40°C (104°F) or more.

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.

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.

1.28

Specific gravity [20˚C (68˚F)]

Specific gravity and state of charge

Complete charge

Charging condition

1.26

1.24

1.22

1.20
1.18

1.16

1.14

1.12

100%

75% 50%

22%

(%)

SC-00094

2014 IMPREZA WRX STI SERVICE MANUAL

QUICK REFERENCE INDEX

FUJI HEAVY INDUSTRIES LTD.

G1180BE3

ENGINE 2 SECTION

This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.

All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.

FUEL INJECTION (FUEL SYSTEMS)

FU(w/o STI)

EMISSION CONTROL
(AUX. EMISSION CONTROL DEVICES)

EC(w/o STI)

INTAKE (INDUCTION)