Nissan Sentra. Instruction — part 688
PG
PREPARATION
PG-3
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PREPARATION
PREPARATION
Special Service Tool
INFOID:0000000009757182
The actual shape of the tools may differ from those illustrated here.
Commercial Service Tool
INFOID:0000000009757183
Tool number
(TechMate No.)
Tool name
Description
—
(—) Model GR8-1200 NI
Multitasking battery and electrical di-
agnostic station
Tests batteries, starting and charging sys-
tems and charges batteries.
For operating instructions, refer to diagnostic
station instruction instruction.
—
(—) Model EXP-800 NI
Battery and electrical diagnostic ana-
lyzer
Tests batteries and charging systems.
For operations instructions, refer to diagnos-
tic analyzer instruction instruction.
AWIIA1239ZZ
JSMIA0806ZZ
Tool name
Description
Power tool
Loosening nuts, screws and bolts
PIIB1407E
PG-4
< BASIC INSPECTION >
BATTERY
BASIC INSPECTION
BATTERY
How to Handle Battery
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CAUTION:
• If it becomes necessary to start the engine with a booster battery and jumper cables, use a 12-volt
booster battery.
• After connecting battery cables, ensure that they are tightly clamped to battery terminals for good
contact.
• Never add distilled water through the hole used to check specific gravity.
METHODS OF PREVENTING OVER-DISCHARGE
The following precautions must be taken to prevent over-discharging a battery.
• The battery surface (particularly its top) should always be kept
clean and dry.
• The terminal connections should be clean and tight.
• At every routine maintenance, check the electrolyte level.
This also applies to batteries designated as “low maintenance” and
“maintenance-free”.
• When the vehicle is not going to be used over a long period of
time, disconnect the battery cable from the negative terminal. (If
the vehicle has an extended storage switch, turn it off.)
Work Flow
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BATTERY DIAGNOSIS WITH EXP-800 NI OR GR8-1200 NI
To diagnose and confirm the condition of the battery, use the following special service tools:
• EXP-800 NI Battery and electrical diagnostic analyzer
• GR8-1200 NI Multitasking battery and electrical diagnostic station
NOTE:
Refer to the applicable Instruction Instruction for proper battery diagnosis procedures.
BATTERY DIAGNOSIS WITHOUT EXP-800 NI OR GR8-1200 NI
Checking Electrolyte Level
WARNING:
Never allow battery fluid to come in contact with skin, eyes, fabrics, or painted surfaces. After touch-
ing a battery, never touch or rub your eyes until you have thoroughly washed your hands. If acid con-
tacts eyes, skin or clothing, immediately flush with water for 15 minutes and seek medical attention.
Failure to do this may cause personal injury or damage to clothing or the painted surfaces.
MEL040F
ELA0349D
PG
BATTERY
PG-5
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• Remove the cell plug using a suitable tool.
• Add distilled water up to the MAX level.
SULFATION
• A battery will be completely discharged if it is left unattended
for a long time and the specific gravity will become less than
1.100. This may result in sulfation on the cell plates.
• To determine if a battery has been “sulfated”, note its voltage
and current when charging it. As shown in the figure, less cur-
rent and higher voltage are observed in the initial stage of
charging sulfated batteries.
• A sulfated battery may sometimes be brought back into ser-
vice by means of a long, slow charge, 12 hours or more, fol-
lowed by a battery capacity test.
Specific Gravity Check
NOTE:
Check the charge condition of the battery.
Periodically check the specific gravity of the electrolyte. Keep a close check on charge condition to prevent
over-discharge.
1. Read hydrometer and thermometer indications at eye level.
2. Use the chart below to correct your hydrometer reading accord-
ing to electrolyte temperature.
Hydrometer Temperature Correction
MEL043F
PKIA2353E
MEL042FA
Battery electrolyte temperature [
°C (°F)]
Add to specific gravity reading
71 (160)
0.032
66 (150)
0.028
60 (140)
0.024
54 (130)
0.020
49 (120)
0.016
43 (110)
0.012
38 (100)
0.008
32 (90)
0.004
27 (80)
0
21 (70)
−0.004
16 (60)
−0.008
10 (50)
−0.012
PG-6
< BASIC INSPECTION >
BATTERY
Charging The Battery
CAUTION:
• Never “quick charge” a fully discharged battery.
• Keep the battery away from open flame while it is being charged.
• When connecting the charger, connect the leads first, then turn on the charger. Never turn on the
charger first, as this may cause a spark.
• If battery electrolyte temperature rises above 55
°C (131 °F), stop charging. Always charge battery at
a temperature below 55
°C (131 °F).
Charging Rates (Standard Charge)
Charging Rates (Quick Charge)
NOTE:
The ammeter reading on your battery charger will automatically decrease as the battery charges. This indi-
cates that the voltage of the battery is increasing normally as the state of charge improves. The charging amps
indicated above refer to initial charge rate.
• If, after charging, the specific gravity of any two cells varies more than 0.050, the battery should be replaced.
4 (40)
−0.016
−1 (30)
−0.020
−7 (20)
−0.024
−12 (10)
−0.028
−18 (0)
−0.032
Battery electrolyte temperature [
°C (°F)]
Add to specific gravity reading
Corrected specific gravity
Approximate charge condition
1.260 - 1.280
Fully charged
1.230 - 1.250
3/4 charged
1.200 - 1.220
1/2 charged
1.170 - 1.190
1/4 charged
1.140 - 1.160
Almost discharged
1.110 - 1.130
Completely discharged
Approximate charge condi-
tion
Charge current (A)
Charge time (h)
Fully charged
7
2
3/4 charged
2.5
1/2 charged
5
1/4 charged
7.5
Almost discharged
9
Completely discharged
10
Approximate charge condi-
tion
Charge current (A)
Charge time (h)
Fully charged
—
—
3/4 charged
16
0.5
1/2 charged
33
1/4 charged
Almost discharged
Completely discharged
—
—
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