Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2005_Q45 sc

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STARTING & CHARGING SYSTEM

K ELECTRICAL

STARTING & CHARGING SYSTEM
SECTION SC B

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

Edition; 2004 May SC-1 2005 Q45
PRECAUTIONS

PRECAUTIONS PFP:00011

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS00F04

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.
Wiring Diagrams and Trouble Diagnosis EKS000A1

When reading wiring diagrams, refer to the following:
q GI-14, "How to Read Wiring Diagrams"
q PG-2, "POWER SUPPLY ROUTING" for power distribution circuit
When performing trouble diagnosis, refer to the following:
q GI-10, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"
q GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"

Edition; 2004 May SC-2 2005 Q45
PREPARATION

PREPARATION PFP:00002
A
Special Service Tools EKS00ESC

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

D
SEL403X

F
Commercial Service Tools EKS00ESD

Tool number G
Description
Tool name

Power tool Loosening bolts and nuts
H

PBIC0190E

Edition; 2004 May SC-3 2005 Q45
BATTERY

BATTERY PFP:00011

How to Handle Battery EKS000A2

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.
q 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.
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. (If
the vehicle has an extended storage switch, turn it off.)

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

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.

Edition; 2004 May SC-4 2005 Q45
BATTERY

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

MEL043F

D
Sulphation
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. E
To determine if a battery has been "sulphated", 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 F
charging sulphated batteries.
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. G

PKIA2353E

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

SC
MEL042FA

Hydrometer Temperature Correction
L
Battery electrolyte temperature

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