Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2003_Q45 sc

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STARTING & CHARGING SYSTEM

K ELECTRICAL

B
SECTION
STARTING & CHARGING SYSTEM C

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

Revision; 2004 April SC-1 2003 Q45
PRECAUTIONS

PRECAUTIONS PFP:00011

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS00F2P

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

Revision; 2004 April SC-2 2003 Q45
PREPARATION

PREPARATION PFP:00002
A
Special Service Tools EKS0014A

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

SEL403X

Revision; 2004 April SC-3 2003 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 negative battery terminal. (If the vehicle has
an extended storage switch, turn it off.)

MEL041F

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:
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; 2004 April SC-4 2003 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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