2008 INFINITI QX56 battery voltage

BRC-112
< PRECAUTION >[VDC/TCS/ABS]
PRECAUTIONS
• Sudden turns (such as spin turns, acceleration turns), drifting, etc. with VDC turned off may cause the yaw
rate/side/decel G sensor to indicate a problem. This is not a problem if normal operation can be resumed
after restarting the engine.
Precaution for CAN SystemINFOID:0000000001604545
• Do not apply voltage of 7.0V or higher to terminal to be measured.
• Maximum open terminal voltage of test er in use must be less than 7.0V.
• Before checking harnesses, turn ignition sw itch OFF and disconnect battery negative cable.
• Area to be repaired must be soldered and wrapped with tape. Make sure that fraying of twisted wire is within 110 mm (4.33 in).
• Do not make a bypass connection to repaired area. (If the circuit is bypassed, characteristics of twisted wire will be lost.)
PKIA0306E
PKIA0307E
Revision: March 2010 2008 QX56

CCS
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2
CCS-25
< COMPONENT DIAGNOSIS >
C
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N P A
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2INFOID:0000000001744705
1.CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors and connect them secu rely again. Erase DTC, then perform self-diagno-
sis of ICC system again.
Does the DTC reset?
YES >> GO TO 2
NO >> • Poor connector connection. • Check connector. Check connector housing for disconnected, loose, bent, and collapsed termi-nals. If any malfunction is detected, repair as as necessary. Erase DTC and perform ICC system
running test. Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
2.CHECK POWER SUPPLY CIRCUIT FOR ICC UNIT
1. Turn ignition switch ON.
2. Check voltage between ICC unit harness connector B17 termi- nals 33, 42 and ground.
Does battery voltage exist?
YES >> GO TO 3
NO >> • Repair ICC unit power supply harness. • Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Run-
ning Test".
3.CHECK GROUND CIRCUIT FOR ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors.
3. Check continuity between ICC unit harness connector B13 ter- minals 19, 20, and connector B17 terminal 46 and ground.
Does continuity exist?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit" . Erase
DTC and perform ICC system running test. Refer to
CCS-8, "
ACTION TEST : ICC System Running Test" .
NO >> • Repair ICC unit ground harness.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test" .
Battery voltage should exist.
SKIA1173E
Continuity should exist.
SKIA6650E
Revision: March 2010
2008 QX56

CCS
DTC 90 STOP LAMP RLY FIXCCS-33
< COMPONENT DIAGNOSIS >
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2. Check continuity between ICC brake hold relay harness connec- tor E134 (B) terminal 3 and IC C unit harness connector B17 (A)
terminal 29.
3. Check continuity between ICC unit harness connector B17 (A) terminal 29 and ground.
Are continuity test results as specified?
YES >> GO TO 7
NO >> • Repair harness between ICC brake hold relay and ICC brake switch. • Repair harness between ICC brake switch and ICC unit.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
7.CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between ICC brake hold relay harness connector E134 terminal 4 and ground.
Does battery voltage exist?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit". Erase
DTC and perform ICC system running test. Refer to
CCS-8, "
ACTION TEST : ICC System Running Test".
NO >> • Check fuse or ICC brake hold relay power supply sys- tem harness.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
8.CHECK STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Check stop lamp switch.
Does stop lamp switch operate normally?
YES >> GO TO 9
NO >> Replace stop lamp switch. Erase DTC and perform ICC system running test. Refer to CCS-8,
"ACTION TEST : ICC System Running Test".
9.CHECK ICC BRAKE HOLD RELAY CIRCUIT
1. Disconnect stop lamp switch connector.
2. When brake pedal is not depressed, make sure that stop lamp does not illuminate.
Does the ICC brake hold relay check OK?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit". Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
NO >> GO TO 10
10.CHECK ICC BRAKE HOLD RELAY Continuity should exist.
Continuity should not exist.
ALOIA0008ZZ
Battery voltage should exist
ALOIA0009ZZ
Revision: March 2010
2008 QX56

CCS
DTC 90 STOP LAMP RLY FIXCCS-35
< COMPONENT DIAGNOSIS >
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1. Connect connectors of ICC unit and stop lamp switch.
2. While performing active test (STOP LAMP: STP LMP DRIVE ON) with CONSULT-III, check voltage between ICC unit harness
connector B17 terminal 47 and ground.
Does battery voltage exist?
YES >> GO TO 14
NO >> Replace ICC unit. Refer to CCS-70, "
ICC Unit". Erase
DTC and perform ICC system running test. Refer to
CCS-8, "
ACTION TEST : ICC System Running Test".
14.CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
Check voltage between ICC brake hold relay harness connector
E134 terminal 7 and ground.
Does battery voltage exist?
YES >> GO TO 15
NO >> • Check fuse or ICC brake hold relay power supply har- ness.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC System Run-
ning Test".
15.CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors.
3. Check continuity between ICC brake hold relay harness connec- tor E134 (B) terminal 6 and IC C unit harness connector B17 (A)
terminal 38.
4. Check continuity between ICC unit harness connector B17 (A) terminal 38 and ground.
Are continuity test results as specified?
YES >> GO TO 16
NO >> • Repair harness between ICC brake hold relay and ICC unit or between ICC brake hold relay and stop lamp switch.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
16.CHECK ICC BRAKE HOLD RELAY
1. Connect ICC unit and ICC brake hold relay harness connectors.
2. Disconnect stop lamp switch connector.
3. Perform active test (STOP LAMP) with CONSULT-III, and make sure that stop lamps are illuminated.
Do the stop lamps illuminate?
YES >> GO TO 17
NO >> Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Refer to CCS-8,
"ACTION TEST : ICC System Running Test".
17.CHECK ICC UNIT STANDARD VOLTAGE
47 - Ground
Battery voltage should exist
(during active test)
SKIA3075E
7 - Ground Battery voltage should exist
ALOIA0010ZZ
6 - 38 Continuity should exist.
38 - Ground Continuity should not exist.
ALOIA0011ZZ
Revision: March 2010 2008 QX56

CCS-46
< ECU DIAGNOSIS >
ICC UNIT
ECU DIAGNOSIS
ICC UNIT
Terminal and Reference Value for ICC UnitINFOID:0000000001756742
Te r m i n a lWire col-
or Item Condition
Voltage (V)
(Approx.)
Ignition
switch Operation
1W/L Battery power supply OFF— Battery voltage
2W/L
5 P CAN-L —— —
7 B/R N-P RANGE ON A/T selector lever in "P" or "N"Battery voltage
10 V/R Brake booster signal ON—
14 L CAN-H —— —
19 B Ground
ON——
20 B
29 BR/W ICC brake switch
(normally closed) Selector le-
ver: Not in “N” or “P” position Depress the brake
pedal
0
Release the brake
pedal Battery voltage
30 L TX —— —
33 R/B Ignition switch power supply ON —
Battery voltage
38 R/G St op la mp sw i tc h
(normally open) OFFDepress the brake pedal
Release the brake pedal
0
39 V/W RX —— —
40 G Parking brake signal
ONParking brake is ON
0
Parking brake is OFF Battery voltage
42 R/B Ignition switch power supply —Battery voltage
46 B Ground ——
47 BR Stop lamp drive output signal Brake operating with ICC system
Battery voltage
Brake not operating with ICC sys-
tem 0
SKIA1243E
Revision: March 2010
2008 QX56

CHG
CHG-1
ELECTRICAL & POWER CONTROL
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SECTION CHG
A
O P
N
CONTENTS
CHARGING SYSTEM
PRECAUTION .......
........................................2
PRECAUTIONS .............................................. .....2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
2
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ............................... ......
2
Precaution for Power Generation Variable Voltage
Control System ..........................................................
3
PREPARATION ............................................4
PREPARATION .............................................. .....4
Special Service Tool ........................................... ......4
Commercial Service Tool ..........................................4
BASIC INSPECTION ....................................5
DIAGNOSIS AND REPAIR WORKFLOW ..... .....5
Work Flow ........................................................... ......5
FUNCTION DIAGNOSIS ...............................8
CHARGING SYSTEM ..................................... .....8
System Diagram .................................................. ......8
System Description ...................................................8
Component Description ............................................8
POWER GENERATION VOLTAGE VARI-
ABLE CONTROL SYSTEM .................................
9
System Diagram .................................................. ......9
System Description ...................................................9
Component Description .............................................9
COMPONENT DIAGNOSIS .........................10
CHARGING SYSTEM PRELIMINARY IN-
SPECTION ....... .................................................
10
Inspection Procedure ........................................... ....10
POWER GENERATION VOLTAGE VARI-
ABLE CONTROL SYSTEM OPERATION IN-
SPECTION ........................................................
11
Inspection Procedure ........................................... ....11
B TERMINAL CIRCUIT .....................................13
Description ...............................................................13
Diagnosis Procedure ...............................................13
L TERMINAL CIRCUIT .....................................14
Description ...............................................................14
Diagnosis Procedure ...............................................14
S TERMINAL CIRCUIT .....................................15
Description ...............................................................15
Diagnosis Procedure ...............................................15
CHARGING SYSTEM .......................................16
Wiring Diagram ........................................................16
SYMPTOM DIAGNOSIS ..............................21
CHARGING SYSTEM .......................................21
Symptom Table ................................................... ....21
ON-VEHICLE REPAIR .................................22
GENERATOR ....................................................22
Removal and Installation ..................................... ....22
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .......................................... ...
23
GENERATOR ....................................................23
Generator ............................................................ ....23
Revision: March 2010 2008 QX56

CHG
PRECAUTIONSCHG-3
< PRECAUTION >
C
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B A
O P
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5. When the repair work is completed, return the ignition switch to the
″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
Precaution for Power Generation Variable Voltage Control SystemINFOID:0000000001538880
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 m ay occur. Do not connect an electrical component
or ground wire directly to the battery terminal.
Revision: March 2010 2008 QX56

CHG-6
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be done
as a set from start to finish.
1.PRELIMINARY INSPECTION
Perform the preliminary inspection. Refer to CHG-10, "
Inspection Procedure".
>> GO TO 2.
2.DISABLE THE POWER GENERATION VO LTAGE VARIABLE CONTROL SYSTEM
Disable the power generation voltage variable control with either of the following procedures.
• After selecting “ENGINE” on the “SELECT SYSTEM” screen of CONSULT-III, set the “ALTERNATOR DUTY” value to 0 % by selecting “ALTERNATOR DUTY” with “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 regulator of the generator.)
• Turn the ignition switch OFF, disconnect the battery current sensor connector and leave it disconnected dur-
ing the course of the test.
NOTE:
Running the engine with the battery current sensor disconnected will cause DTC's (P1550-P1554) to set.
After finishing the inspection, connect the battery current sensor connector and erase the self-diagnostic
results history of the engine using CONSULT-III.
>> GO TO 3.
3.DIAGNOSIS WITH STARTING /CHARGING SYSTEM TESTER
Perform the charging system test using Starting/Charging System Test er (J-44373). For details and operating
instructions, refer to Technical Service Bulletin.
Te s t r e s u l t
CHARGING SYSTEM NOMAL>>Charging 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 generator. Perf orm “DIODE RIPPLE” test again using Starting/
Charging System Tester (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.TERMINAL“2” (OPEN) CIRCUIT INSPECTION
Check terminal “2” circuit for open circuits. Refer to CHG-14, "
Diagnosis Procedure".
Is the terminal
“2” circuit normal?
YES >> Replace generator.
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.TERMINAL “2”(SHORT) CIRCUIT INSPECTION
Check terminal “2” circuit for short to ground. Refer to CHG-14, "
Diagnosis Procedure".
Is the terminal
“2” circuit normal?
Revision: March 2010 2008 QX56