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K ELECTRICAL

STARTING & CHARGING SYSTEM
SECTION SC B

E
CONTENTS
PRECAUTIONS ......................................................... 2
. DIAGNOSTIC PROCEDURE 2 .......................... 16 . F
Precautions for Supplemental Restraint System MINIMUM SPECIFICATION OF CRANKING
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- VOLTAGE REFERENCING COOLANT TEM-
SIONER" ................................................................. 2
. PERATURE ........................................................ 17 . G
Precautions for Power Generation Variable Voltage Removal and Installation ....................................... 17 .
Control System ........................................................ 2
. REMOVAL .......................................................... 17 .
Wiring Diagrams and Trouble Diagnosis ................. 2 . INSTALLATION .................................................. 18 .
H
PREPARATION .......................................................... 3
. CHARGING SYSTEM .............................................. 19 .
Special Service Tool ................................................ 3
. System Description ................................................ 19 .
Commerical Service Tools ....................................... 3 . POWER GENERATION VARIABLE VOLTAGE
BATTERY ................................................................... 4
. CONTROL SYSTEM .......................................... 19 . I
How to Handle Battery ............................................ 4 . Wiring Diagram -- CHARGE -- ............................ 21 .
METHODS OF PREVENTING OVER-DIS- Trouble Diagnoses with Battery/Starting/Charging
CHARGE .............................................................. 4
. System Tester ........................................................ 22. J
CHECKING ELECTROLYTE LEVEL ................... 4 . DIAGNOSTIC RESULT ITEM CHART ............... 23 .
SPECIFIC GRAVITY CHECK .............................. 5 . WORK FLOW ..................................................... 24 .
CHARGING THE BATTERY ................................ 6 . PRELIMINARY INSPECTION ............................ 25 .
SC
Trouble Diagnoses with Battery/Starting/Charging DIAGNOSTIC PROCEDURE 1 .......................... 25 .
System Tester ......................................................... 6
. DIAGNOSTIC PROCEDURE 2 .......................... 26 .
DIAGNOSTIC RESULT ITEM CHART ................. 8 . DIAGNOSTIC PROCEDURE 3 .......................... 27 .
Removal and Installation ......................................... 9 . DIAGNOSTIC PROCEDURE 4 .......................... 28 . L
REMOVAL ............................................................ 9
. Power Generation Variable Voltage Control System
INSTALLATION .................................................... 9. Inspection .............................................................. 29
.
STARTING SYSTEM ............................................... 10 . Removal and Installation ....................................... 30 . M
System Description ............................................... 10. REMOVAL .......................................................... 30 .
Wiring Diagram -- START -- .................................11 . GENERATOR PULLEY INSPECTION ............... 31 .
Trouble Diagnoses with Battery/Starting/Charging INSTALLATION .................................................. 31 .
System Tester ....................................................... 13
. SERVICE DATA AND SPECIFICATIONS (SDS) ..... 32 .
DIAGNOSTIC RESULT ITEM CHART ............... 13 . Battery ................................................................... 32
.
WORK FLOW ..................................................... 14 . Starter .................................................................... 32
.
DIAGNOSTIC PROCEDURE 1 .......................... 15 . Generator .............................................................. 32
.

Revision: November 2005 SC-1 2005 Pathfinder
PRECAUTIONS

PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS009IR

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:
G 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.
G 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.
G 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.
Precautions for Power Generation Variable Voltage Control System EKS00D89

CAUTION:
For this model, the battery current sensor that is installed to the negative battery cable measures the
charging/discharging current of the battery and performs various engine controls. If an electrical com-
ponent is connected directly to the negative battery terminal, the current flowing through that compo-
nent will not be measured by the battery current sensor. This condition may cause a malfunction of
the engine control system and battery discharge may occur. Do not connect an electrical component
or ground wire directly to the battery terminal.
Wiring Diagrams and Trouble Diagnosis EKS009IS

When you read wiring diagrams, refer to the following:
G GI-15, "How to Read Wiring Diagrams" .
G PG-4, "POWER SUPPLY ROUTING CIRCUIT" for power distribution circuit.
When you perform trouble diagnosis, refer to the following:
G GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES".
G GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident".

Revision: November 2005 SC-2 2005 Pathfinder
PREPARATION

PREPARATION PFP:00002
A
Special Service Tool EKS009IT

Tool number Description
(Kent-Moore No.) B
Tool name
J-44373 Model 620
Battery/Starting/Charging system
C
tester

D
SEL403X

Commerical Service Tools EKS009IU

Tool number Description G
Tool name
Power tool Loosening bolts and nuts
H

PBIC0190E

Revision: November 2005 SC-3 2005 Pathfinder
BATTERY

BATTERY PFP:AYBGL

How to Handle Battery EKS009IV

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

MEL040F

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

MEL041F

G 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

CHECKING ELECTROLYTE LEVEL
WARNING:
Do not allow battery fluid to come in contact with skin, eyes, fabrics, or painted surfaces. After touch-
ing a battery, do not 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.

Revision: November 2005 SC-4 2005 Pathfinder
BATTERY

G Remove the cell plug using a suitable tool.
G Add distilled water up to the MAX level. A

MEL043F

D
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 of the cell plates. E
To determine if a battery has been sulfated, note its voltage and
current when charging it. As shown in the figure, less current
and higher voltage are observed in the initial stage of charging F
sulfated batteries.
A sulfated battery may sometimes be brought back into service
by means of a long, slow charge, 12 hours or more, followed by
a battery capacity test. G

PKIA2353E

SPECIFIC GRAVITY CHECK H
1. Read hydrometer and thermometer indications at eye level.
2. Use the following chart to correct your hydrometer reading
according to electrolyte temperature. I

SC
MEL042FA

Hydrometer Temperature Correction
L
Battery electrolyte temperature

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