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STARTING & CHARGING SYSTEM

K ELECTRICAL

STARTING & CHARGING SYSTEM
SECTION SC B

E
CONTENTS
PRECAUTIONS ......................................................... 2
. Removal and Installation ....................................... 17 . F
Precautions for Supplemental Restraint System VK45DE ENGINE MODELS ............................... 17 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- VQ35DE ENGINE MODELS (2WD) ................... 18 .
SIONER" ................................................................. 2
. VQ35DE ENGINE MODELS (AWD) ................... 19 . G
PREPARATION .......................................................... 3
. Disassembly and Assembly ................................... 20 .
Special Service Tools .............................................. 3
. VK45DE ENGINE MODELS ............................... 20 .
Commercial Service Tools ....................................... 3 . VQ35DE ENGINE MODELS (2WD) ................... 21 .
H
BATTERY ................................................................... 4
. VQ35DE ENGINE MODELS (AWD) ................... 22 .
How to Handle Battery ............................................ 4 . INSPECTION AFTER DISASSEMBLY ............... 22 .
METHODS OF PREVENTING OVER-DIS- CHARGING SYSTEM .............................................. 23 .
CHARGE .............................................................. 4
. System Description ................................................ 23 . I
CHECKING ELECTROLYTE LEVEL ................... 5 . MALFUNCTION INDICATOR ............................. 23 .
SPECIFIC GRAVITY CHECK .............................. 5 . Wiring Diagram -- CHARGE -- ............................ 24 .
CHARGING THE BATTERY ................................ 6 . VK45DE ENGINE MODELS ............................... 24 . J
Trouble Diagnosis with Battery/Starting/Charging VQ35DE ENGINE MODELS .............................. 25 .
System Tester (Battery) ........................................... 6. Trouble Diagnosis with Battery/Starting/Charging
DIAGNOSTIC RESULT ITEM CHART ................. 8 . System Tester (Charging) ...................................... 26 .
SC
Removal and Installation ......................................... 9 . DIAGNOSTIC RESULT ITEM CHART ............... 27 .
REMOVAL ............................................................ 9
. WORK FLOW ..................................................... 28 .
INSTALLATION .................................................... 9. PRELIMINARY INSPECTION ............................ 29 .
STARTING SYSTEM ............................................... 10 . DIAGNOSTIC PROCEDURE 1 .......................... 30 . L
System Description ............................................... 10. DIAGNOSTIC PROCEDURE 2 .......................... 31 .
Wiring Diagram -- START -- .................................11 . DIAGNOSTIC PROCEDURE 3 .......................... 31 .
VK45DE ENGINE MODELS ...............................11 . DIAGNOSTIC PROCEDURE 4 .......................... 32 . M
VQ35DE ENGINE MODELS .............................. 12 . Removal and Installation ....................................... 33 .
Trouble Diagnosis with Battery/Starting/Charging VK45DE ENGINE MODELS ............................... 33 .
System Tester (Starting) ........................................ 13 . VQ35DE ENGINE MODELS .............................. 34 .
DIAGNOSTIC RESULT ITEM CHART ............... 13 . Disassembly and Assembly ................................... 36 .
WORK FLOW ..................................................... 14 . VK45DE ENGINE MODELS ............................... 36 .
DIAGNOSTIC PROCEDURE 1 .......................... 15 . VQ35DE ENGINE MODELS .............................. 37 .
DIAGNOSTIC PROCEDURE 2 .......................... 16 . SERVICE DATA AND SPECIFICATIONS (SDS) ..... 38 .
MINIMUM SPECIFICATION OF CRANKING Battery ................................................................... 38
.
VOLTAGE REFERENCING COOLANT TEM- Starter .................................................................... 38
.
PERATURE ........................................................ 16
. Alternator ............................................................... 38
.

Revision: 2005 July SC-1 2005 FX
PRECAUTIONS

PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" AKS00794

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Revision: 2005 July SC-2 2005 FX
PREPARATION

PREPARATION PFP:00002
A
Special Service Tools AKS00797

Tool number
Description
Tool name B
J-44373 Model 620
Battery/Starting/Charging system
tester C

D
SEL403X

F
Commercial Service Tools AKS00798

Tool number G
Description
Tool name

Power tool Loosening bolts and nuts
H

PBIC0190E

Revision: 2005 July SC-3 2005 FX
BATTERY

BATTERY PFP:AYBGL

How to Handle Battery AKS00799

CAUTION:
q If it becomes necessary to start the engine with a booster battery and jumper cables, use a 12-volt
booster battery.
q After connecting battery cables, ensure that they are tightly clamped to battery terminals for good
contact.
METHODS OF PREVENTING OVER-DISCHARGE
The following precautions must be taken to prevent over-discharging
a battery.
q The battery surface (particularly its top) should always be kept
clean and dry.
q The terminal connections should be clean and tight.
q At every routine maintenance, check the electrolyte level.
This also applies to batteries designated as "low maintenance"
and "maintenance-free".

MEL040F

q When the vehicle is not going to be used over a long period of
time, disconnect the battery cable from the negative terminal.

ELA0349D

q 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.

MEL042F

Revision: 2005 July SC-4 2005 FX
BATTERY

CHECKING ELECTROLYTE LEVEL
WARNING: A
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. B
q Remove the cell plug using a suitable tool.
q Add distilled water up to the MAX level.
C

E
MEL043F

Sulphation
F
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 sulphation on the cell plates.
To determine if a battery has been "sulphated", note its voltage G
and current when charging it. As shown in the figure, less cur-
rent and higher voltage are observed in the initial stage of
charging sulphated batteries. H
A sulphated 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.
I
PKIA2353E

SPECIFIC GRAVITY CHECK
1. Read hydrometer and thermometer indications at eye level. J
2. Use the chart below to correct your hydrometer reading accord-
ing to electrolyte temperature.
SC

MEL042FA M
Hydrometer Temperature Correction
Battery electrolyte temperature

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