2011 INFINITI QX56 Factory Service Manual

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Page 921 of 5598

INFINITI QX56 2011 Factory Service Manual
CHG-8
< SYSTEM DESCRIPTION >
SYSTEM
scription
INFOID:0000000006274863
By performing the power generation voltage variable c ontrol, the engine load due to the power generation of
the alternator is re

Page 922 of 5598

INFINITI QX56 2011 Factory Service Manual
CHG
CHARGING SYSTEMCHG-9
< WIRING DIAGRAM >
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WIRING DIAGRAM
CHARGING SYSTEM
Wiring DiagramINFOID:0000000006274864
JCMWM8336GB
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
CHG-10
< WIRING DIAGRAM >
CHARGING SYSTEM
JCMWM8337GB
Revision: 2010 May2011 QX56

Page 924 of 5598

INFINITI QX56 2011 Factory Service Manual
CHG
CHARGING SYSTEMCHG-11
< WIRING DIAGRAM >
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JCMWM8338GB
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
CHG-12
< WIRING DIAGRAM >
CHARGING SYSTEM
JCMWM8339GB
Revision: 2010 May2011 QX56

Page 926 of 5598

INFINITI QX56 2011 Factory Service Manual
CHG
DIAGNOSIS AND REPAIR WORKFLOWCHG-13
< BASIC INSPECTION >
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000006274884
OVERALL SEQUENCE
DETAILED FLO

Page 927 of 5598

INFINITI QX56 2011 Factory Service Manual
CHG-14
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and alternator test segments must be done
as a set from start to fini

CHG-14
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and alternator test segments must be done
as a set from start to finish.
1.PRELIMINARY INSPECTION
Perform the preliminary inspection. Refer to CHG-16, "
Inspection Procedure".
>> GO TO 2.
2.STOP POWER GENERATION VOLT AGE VARIABLE CONTROL SYSTEM
Stop the operation of the power generation voltage variabl e control in either of the following procedures.
After selecting “ENGINE” of “SELECT SYSTEM” usi ng CONSULT-III, set the DUTY value of “ALTERNATOR
DUTY” to 0 % by selecting “ALTERNATOR DUTY” of “Active Test”. Continue “Active Test” until the end of
inspection. (When the DUTY value is 0 or 100 %, the normal power generation is performed according to the
characteristic of the IC voltage regulator of the alternator.)
Turn the ignition switch OFF, and disconnect the batte ry current sensor connector. [However, DTC (P1550 -
P1554) of the engine might remain. After finishing the inspection, connect the battery current sensor connec-
tor and erase the self-diagnosis results history of the engine using CONSULT-III.]
>> GO TO 3.
3.DIAGNOSIS WITH STARTING /CHARGING SYSTEM TESTER
Perform the charging system test us ing Starting/Charging System Tester (SST: J-44373). For details and oper-
ating instructions, refer to Technical Service Bulletin.
Te s t r e s u l t
CHARGING SYSTEM NORMAL>>Char ging system is normal and will also show “DIODE RIPPLE” test
result.
NO CHARGING VOLTAGE>>GO TO 4.
LOW CHARGING VOLTAGE>>GO TO 12.
HIGH CHARGING VOLTAGE>>GO TO 14.
DIODE RIPPLE NORMAL>>Diode ripple is OK and will also show “CHARGING VOLTAGE” test result.
EXCESS RIPPLE DETECTED>>Replace the alternator. Perform “DIODE RIPPLE” test again using Starting/
Charging System Tester (SST : J-44373) to confirm repair.
DIODE RIPPLE NOT DETECTED>>GO TO 4.
4.INSPECTION WITH CHARGE WARNING LAMP (IGNITION SWITCH IS ON)
Turn the ignition switch ON.
Does the charge warning lamp illuminate?
YES >> GO TO 6.
NO >> GO TO 5.
5.“L” TERMINAL CIRCUIT (OPEN) INSPECTION
Check “L” terminal circuit (open). Refer to CHG-20, "
Diagnosis Procedure".
Is the
“L” terminal circuit normal?
YES >> Replace alternator.
NO >> Repair as needed.
6.INSPECTION WITH CHARGE WARNING LAMP (IDLING)
Start the engine and run it at idle.
Does the charge warning lamp turn OFF?
YES >> GO TO 9.
NO >> GO TO 7.
7.“L” TERMINAL CIRCUIT (SHORT) INSPECTION
Check “L” terminal circuit (short). Refer to CHG-22, "
Diagnosis Procedure".
Is the
“L” terminal circuit normal?
YES >> GO TO 8.
NO >> Repair as needed.
Revision: 2010 May2011 QX56

Page 928 of 5598

INFINITI QX56 2011 Factory Service Manual
CHG
DIAGNOSIS AND REPAIR WORKFLOWCHG-15
< BASIC INSPECTION >
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8.“S” TERMINAL CIRCUIT INSPECTION
Check “S” terminal circuit. Refer to CHG-23, "
Diagnosis Procedure

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