2007 INFINITI QX56 Factory Service Manual

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Page 2657 of 3061

INFINITI QX56 2007 Factory Service Manual STARTING SYSTEM
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STARTING SYSTEM
System DescriptionINFOID:0000000003533319
Power is supplied at all times
• through 40A fusible link (lett

Page 2658 of 3061

INFINITI QX56 2007 Factory Service Manual SC-10
< SERVICE INFORMATION >
STARTING SYSTEM
Wiring Diagram - START -
INFOID:0000000003533320
Trouble Diagnosis with Battery/Starting/Charging System TesterINFOID:0000000003533321
NOTE:
To ensure a c

Page 2659 of 3061

INFINITI QX56 2007 Factory Service Manual STARTING SYSTEM
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1. Turn off all loads on the vehicle electrical system.
2. Perform battery test with Battery/Starting/Charging system
test

Page 2660 of 3061

INFINITI QX56 2007 Factory Service Manual SC-12
< SERVICE INFORMATION >
STARTING SYSTEM
DIAGNOSTIC PROCEDURE 1
Check Starter Motor Circuit
1.CHECK POWER SUPPLY TO STARTER MOTOR
1. Remove the fuel pump fuse.
2. Crank or start the engine (where

Page 2661 of 3061

INFINITI QX56 2007 Factory Service Manual STARTING SYSTEM
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4. Check that the starter motor connector F27 connection is clean and tight.
5. Check voltage between starter motor connec

Page 2662 of 3061

INFINITI QX56 2007 Factory Service Manual SC-14
< SERVICE INFORMATION >
STARTING SYSTEM
• Starter relay [within the intelligent power distribution module engine room (IPDM E/R)]
• Harness for open or short
2.CHECK VOLTAGE DROP ON MAGNETIC

Page 2663 of 3061

INFINITI QX56 2007 Factory Service Manual CHARGING SYSTEM
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CHARGING SYSTEM
System DescriptionINFOID:0000000003533323
The generator provides DC voltage to operate the vehicles elect

CHARGING SYSTEM
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CHARGING SYSTEM
System DescriptionINFOID:0000000003533323
The generator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times to generator terminal 3 through
• 10A fuse (No. 30, located in the fuse and fusible link box).
Terminal 1 supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is
controlled by the IC regulator at terminal 3 detecting the input voltage. A pulse width modulated (PWM) signal
is sent from terminal 37 of the IPDM E/R to terminal 4 of the generator. The ECM determines the duty cycle of
the power generation variable voltage control system. The charging circuit is protected by the 140A fusible link
[letter a, located in the fusible link box (battery)].
The generator is grounded through the engine.
With the ignition switch in the ON or START position, power is supplied
• through 10A fuse [No. 14, located in the fuse block (J/B)]
• to combination meter terminal 24 for the charge warning lamp.
Ground is supplied to terminal 13 of the combination meter through terminal 2 of the generator. With power
and ground supplied, the charge warning lamp will illuminate. When the generator is providing sufficient volt-
age with the engine running, the ground is opened and the charge warning lamp will go off. If the charge warn-
ing lamp illuminates with the engine running, a fault is indicated. The IC regulator warning function activates to
illuminate “CHARGE” warning lamp, if any of the following symptoms occur while generator is operating:
• Excessive voltage is produced.
• No voltage is produced.
POWER GENERATION VARIABLE VOLTAGE CONTROL SYSTEM
NOTE:
Power generation variable voltage control system has been adopted. By varying the voltage to the generator,
engine load due to power generation of the generator is reduced and fuel consumption is decreased.
Operation
• The battery current sensor detects the charging/discharging current of the battery. ECM judges the battery
condition based on this signal.
• ECM judges whether to control voltage according to the battery condition.
• ECM calculates the target power generation voltage according to the battery condition and sends the calcu-
lated value, through CAN lines, as the power generation command value to IPDM E/R.
• IPDM E/R converts the received power generation command value into the power generation command sig-
nal (PWM signal) and sends it to the IC regulator.
• The IC regulator performs final control over the power generation voltage.
• When there is no power generation command signal, the generator performs the normal power generation
according to the characteristic of the IC regulator.
NOTE:
When any malfunction is detected in the power generation variable voltage control system, power generation
is performed according to the characteristic of the IC regulator in the generator.
PKIB4908E

Page 2664 of 3061

INFINITI QX56 2007 Factory Service Manual SC-16
< SERVICE INFORMATION >
CHARGING SYSTEM
Component
BATTERY CURRENT SENSOR
• Battery current sensor is installed to the negative battery cable and
it detects the charging/discharging current of

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