engine INFINITI QX56 2006 Factory Service Manual

CHASSIS AND BODY MAINTENANCEMA-25
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2. Remove the drain plug and gasket to drain the transfer fluid as
shown.
3. Install the new gasket on the drain plug and install the drain plug in the transfer. Tighten the drain plug to specification.
CAUTION:
Do not reuse the gasket.
FILLING
1. Remove the filler plug and gasket.
2. Fill with new specified fluid until the fluid level reaches the spec-ified limit near the filler plug mounting hole as shown.
CAUTION:
Carefully fill the transfer with fluid. Filling should take
approximately three minutes.
3. Leave the vehicle for three minutes and then check the fluid level again as shown.
4. Install the new gasket on the filler plug and install the filler plug in the transfer. Tighten the filler plug to specification.
CAUTION:
Do not reuse the gasket.
Checking Transfer FluidELS001H1
FLUID LEAKAGE AND FLUID LEVEL
1. Check for any fluid leaks from the transfer assembly or around it and correct as necessary.
2. Remove the filler plug to check the fluid level at the filler plugmounting hole as shown.
CAUTION:
Do not start the engine while checking the fluid level.
3. Install the new gasket on the filler plug and install the filler plug in the transfer. Tighten the filler plug to specification.
CAUTION:
Do not reuse the gasket.
Checking Propeller ShaftELS001C5
Check the front and rear propeller shafts for damage, dents, and cracks. Check the joints for looseness and
any damage. Repair or replace as necessary.
Checking Final Drive OilELS001H3
1. Remove the filler plug. Drain plug : Refer to
TF-146, "
COMPONENTS" .
SMA444B
Fluid capacity and grade : Refer to MA-11, "Fluids
and Lubricants" .
Filler plug : Refer to TF-146, "
COMPONENTS" .
SMA439B
Filler plug : Refer to TF-146, "COMPONENTS" .
SMA439B

MA-28
CHASSIS AND BODY MAINTENANCE
Revision: November 20092006 QX56
Wheel Balance (Maximum Allowable Imbalance)

If either residual imbalance value exceeds 5 g (0.18 oz), repeat installation procedures.
Tire RotationELS001H5
1. Rotate the tires on each side from front to back as shown.
2. Adjust the tire pressure to specification. Refer to WT-38, "
Tire" .
3. After the tire rotation, retighten the wheel nuts after the vehicle has been driven for 1,000 km (600 miles), and also after a wheel
and tire have been installed such as after repairing a flat tire.
Checking Brake Fluid Level and LeaksELS001CA

Check the brake fluid level in the reservoir tank. It should be
between the “MAX ” and “MIN” lines on the reservoir tank.

If the fluid level is extremely low, check the brake system.

If the brake warning lamp comes on when the fluid is at the cor-
rect level, check the brake fluid level switch and the parking
brake switch.
Checking Brake Lines and CablesELS001CB
1. Check the brake lines and hoses for cracks, deterioration, and
other damage. Replace any damaged parts.
CAUTION:
If brake fluid leaks are visible around the brake line joints,
retighten the joint, or replace damaged parts as necessary.
2. Check for brake fluid leaks by fully depressing brake pedal while engine is running.
Checking Disc BrakeELS001CC
ROTOR
Check the rotor condition for wear or damage. Refer to BR-32,
"Front Disc Brake" , BR-33, "Rear Disc Brake" .
Maximum allowable imbalance Dynamic (At rim flange)
5 g (0.18 oz) (one side)
Static 10 g (0.35 oz)
Wheel nuts : Refer to WT-6, "WHEEL AND TIRE
ASSEMBLY" .
AMA159
WFIA0173E
SBR389C
SMA260A

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CALIPER
Check the caliper for any leaks, repair as necessary.
PA D
Check the pads for wear or damage. Refer to BR-32, "Front Disc
Brake" , BR-33, "Rear Disc Brake" .
Checking Steering Gear and LinkageELS001CD
STEERING GEAR

Check the steering gear housing for looseness, damage and oil
leakage as shown.

Check the steering column connections for looseness.
STEERING LINKAGE

Check the ball joint, dust cover and other component parts for looseness, wear, damage, and grease leak-
age.
Checking Power Steering Fluid and LinesELS001CE
CHECKING FLUID LEVEL

Check the power steering fluid level with the engine off.

Check fluid level on reservoir. Use “HOT ” range at fluid tempera-
tures of 50 ° to 80 °C (122 ° to 176 °F). Use “COLD” range at fluid
temperatures of 0 ° to 30 °C (32 ° to 86 °F).
CAUTION:

Do not overfill.

Refer to MA-11, "Fluids and Lubricants" .
SMA922A
LMA051
SGIA0506E
LGIA0021E

PG-1
POWER SUPPLY, GROUND & CIRCUIT ELEMENTS
K ELECTRICAL
CONTENTS
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PRECAUTIONS .....................................................
..... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 3
POWER SUPPLY ROUTING CIRCUIT ................. ..... 4
Schematic ........................................................... ..... 4
Wiring Diagram — POWER — ................................. 6 BATTERY POWER SUPPLY — IGNITION SW.
IN ANY POSITION ................................................ 6
ACCESSORY POWER SUPPLY — IGNITION
SW. IN ACC OR ON ............................................. 11
IGNITION POWER SUPPLY — IGNITION SW.
IN ON ............................................................... ... 12
IGNITION POWER SUPPLY — IGNITION SW.
IN ON AND/OR START .................................... ... 13
Fuse .................................................................... ... 17
Fusible Link ......................................................... ... 17
Circuit Breaker (Built Into BCM) .......................... ... 17
IPDM E/R (INTELLIGENT POWER DISTRIBUTION
MODULE ENGINE ROOM) ................................... ... 18
System Description ............................................. ... 18
SYSTEMS CONTROLLED BY IPDM E/R ........ ... 18
CAN COMMUNICATION LINE CONTROL ...... ... 18
IPDM E/R STATUS CONTROL ........................ ... 19
CAN Communication System Description ........... ... 19
Function of Detecting Ignition Relay Malfunction ... 19
CONSULT-II Function IPDM E/R ......................... ... 20
CONSULT-II BASIC OPERATION ................... ... 20
SELF-DIAGNOSTIC RESULTS ....................... ... 21
DATA MONITOR .............................................. ... 21
ACTIVE TEST .................................................. ... 23
Auto Active Test .................................................. ... 24
DESCRIPTION ................................................. ... 24
OPERATION PROCEDURE ............................ ... 24
INSPECTION IN AUTO ACTIVE TEST MODE ... 24
Schematic ........................................................... ... 26
IPDM E/R Terminal Arrangement ........................ ... 27
IPDM E/R Power/Ground Circuit Inspection ....... ... 28Inspection with CONSULT-II (Self-Diagnosis) .....
... 29
Removal and Installation of IPDM E/R ................ ... 30
REMOVAL ........................................................ ... 30
INSTALLATION ................................................ ... 30
GROUND CIRCUIT ................................................ ... 31
Ground Distribution ................................................. 31 MAIN HARNESS ................................................. 31
ENGINE ROOM HARNESS ............................. ... 34
ENGINE CONTROL HARNESS ....................... ... 37
BODY HARNESS ............................................. ... 38
BODY NO. 2 HARNESS .................................. ... 39
BACK DOOR NO. 2 RH HARNESS ................. ... 40
HARNESS .............................................................. ... 41
Harness Layout ...................................................... 41 HOW TO READ HARNESS LAYOUT .............. ... 41
OUTLINE .......................................................... ... 42
MAIN HARNESS ................................................. 43
ENGINE ROOM HARNESS (LH VIEW) ........... ... 45
ENGINE ROOM HARNESS (RH VIEW) .......... ... 48
ENGINE CONTROL HARNESS ....................... ... 50
CHASSIS HARNESS ....................................... ... 52
BODY HARNESS ............................................. ... 54
BODY NO. 2 HARNESS .................................. ... 56
ROOM LAMP HARNESS ................................. ... 58
FRONT DOOR LH HARNESS ......................... ... 59
FRONT DOOR RH HARNESS ......................... ... 59
REAR DOOR LH HARNESS ............................ ... 60
REAR DOOR RH HARNESS ........................... ... 60
BACK DOOR HARNESS ................................. ... 61
Wiring Diagram Codes (Cell Codes) ................... ... 62
ELECTRICAL UNITS LOCATION ......................... ... 65
Electrical Units Location ...................................... ... 65
ENGINE COMPARTMENT ............................... ... 65
PASSENGER COMPARTMENT ...................... ... 66
HARNESS CONNECTOR ...................................... ... 68
Description ........................................................... ... 68
HARNESS CONNECTOR (TAB-LOCKING
TYPE) ............................................................... ... 68
HARNESS CONNECTOR (SLIDE-LOCKING

PG-18
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Revision: November 20092006 QX56
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PFP:284B7
System DescriptionEKS00BN2

IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block
which were originally placed in engine compartment. It controls integrated relays via IPDM E/R control cir-
cuits.

IPDM E/R-integrated control circuits perform ON-OFF operation of relays, CAN communication control,
etc.

It controls operation of each electrical component via ECM, BCM and CAN communication lines.
CAUTION:
None of the IPDM E/R integrated relays can be removed.
SYSTEMS CONTROLLED BY IPDM E/R
1. Lamp control Using CAN communication lines, it receives signals from the BCM and controls the following lamps:

Headlamps (Hi, Lo)

Parking lamps

Tail and license lamps

Front fog lamps
2. Wiper control Using CAN communication lines, it receives signals from the BCM and controls the front wipers.
3. Rear window defogger relay control Using CAN communication lines, it receives signals from the BCM and controls the rear window defogger
relay.
4. A/C compressor control Using CAN communication lines, it receives signals from the ECM and controls the A/C compressor
(magnetic clutch).
5. Starter control Using CAN communication lines, it receives signals from the BCM and controls the starter relay.
6. Cooling fan control Using CAN communication lines, it receives signals from the ECM and controls the cooling fan relays.
7. Horn control Using CAN communication lines, it receives signals from the BCM and controls the horn relay.
CAN COMMUNICATION LINE CONTROL
With CAN communication, by connecting each control unit using two communication lines (CAN L-line, CAN
H-line), it is possible to transmit a maximum amount of information with minimum wiring. Each control unit can
transmit and receive data, and reads necessary information only.
1. Fail-safe control

When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control.
After CAN communication returns to normal operation, it also returns to normal control.

Operation of control parts by IPDM E/R during fail-safe mode is as follows:
Controlled system Fail-safe mode
Headlamp

With the ignition switch ON, the headlamp (low) is ON.

With the ignition switch OFF, the headlamp (low) is OFF.
Tail and parking lamps

With the ignition switch ON, the tail and parking lamps are ON.

With the ignition switch OFF, the tail and parking lamps are OFF.
Cooling fan

With the ignition switch ON, the cooling fan HI operates.

With the ignition switch OFF, the cooling fan stops.
Front wiper Until the ignition switch is turned off, the front wiper LO and HI remains in the same status it
was in just before fail
−safe control was initiated.
Rear window defogger Rear window defogger relay OFF

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IPDM E/R STATUS CONTROL
In order to save power, IPDM E/R switches status automatically based on each operating condition.
1. CAN communication status

CAN communication is normally performed with other control units.

Individual unit control by IPDM E/R is normally performed.

When sleep request signal is received from BCM, mode is switched to sleep waiting status.
2. Sleep waiting status

Process to stop CAN communication is activated.

All systems controlled by IPDM E/R are stopped. When 1 second has elapsed after CAN communica-
tion with other control units is stopped, mode switches to sleep status.
3. Sleep status

IPDM E/R operates in low current-consumption mode.

CAN communication is stopped.

When a change in CAN communication signal is detected, mode switches to CAN communication sta-
tus.

When a change in ignition switch signal is detected, mode switches to CAN communication status.
CAN Communication System DescriptionEKS00BN3
Refer to LAN-26, "CAN COMMUNICATION" .
Function of Detecting Ignition Relay MalfunctionEKS00BN4

When the integrated ignition relay is stuck in a "closed contact" position and cannot be turned OFF, IPDM
E/R turns ON tail and parking lamps for 10 minutes to indicate IPDM E/R malfunction.

When the state of the integrated ignition relay does not agree with the state of the ignition switch signal
received via CAN communication, the IPDM E/R activates the tail lamp relay.
NOTE:
When the ignition switch is turned ON, the tail lamps are OFF.
A/C compressor A/C compressor OFF
Front fog lamps Front fog lamp relay OFF
Controlled system
Fail-safe mode
Ignition switch signalIgnition relay status Tail lamp relay
ON ON —
OFF OFF —
ON OFF —
OFF ON ON (10 minutes)

PG-20
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Revision: November 20092006 QX56
CONSULT-II Function IPDM E/REKS00BN5
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II BASIC OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CON-
SULT-II CONVERTER to the data link connector, then turn igni-
tion switch ON.
2. Touch “START (NISSAN BASED VHCL) ”.
3. Touch “IPDM E/R” on “SELECT SYSTEM ” screen.

If “IPDM E/R” is not displayed refer to GI-40, "CONSULT-II
Data Link Connector (DLC) Circuit" .
IPDM E/R diagnostic Mode Description
SELF-DIAG RESULTS Displays IPDM E/R self-diagnosis results. DATA MONITOR Displays IPDM E/R input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
BBIA0369E
BCIA0029E
BCIA0030E

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4. Select the desired part to be diagnosed on the "SELECT DIAG
MODE" screen.
SELF-DIAGNOSTIC RESULTS
Operation Procedure
1. Touch “SELF-DIAG RESULTS ” on “SELECT DIAG MODE”
screen.
2. Self-diagnosis results are displayed.
Display Item List
NOTE:
The details for display of the period are as follows:

CRNT: Error currently detected with IPDM E/R.

PAST: Error detected in the past and placed in IPDM E/R memory.
DATA MONITOR
Operation Procedure
1. Touch “DATA MONITOR ” on “SELECT DIAG MODE ” screen.
2. Touch "ALL SIGNALS ”, “MAIN SIGNALS” or “SELECTION FROM MENU ” on the “DATA MONITOR ”
screen.
3. Touch “START”.
4. When "SELECTION FROM MENU" is selected, touch items to be monitored. When "ALL SIGNALS" is selected, all the items will be monitored. When "MAIN SIGNALS" is selected, predetermined items are
monitored.
BCIA0031E
WKIA1264E
Display items CONSULT-II
display code Malfunction detection TIME
Possible causes
CRNT PAST
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED. ———
——
CAN COMM CIRC U1000

If CAN communication reception/transmission
data has a malfunction, or if any of the control
units fail, data reception/transmission cannot
be confirmed.

When the data in CAN communication is not
received before the specified time. XX
Any of items listed
below have errors:

TRANSMIT DIAG

ECM

BCM/SEC
ALL SIGNALS
All signals will be monitored.
MAIN SIGNALS Monitors the predetermined item(s).
SELECTION FROM MENU Selects and monitors individual signal(s).

PG-22
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Revision: November 20092006 QX56
5. Touch “RECORD” while monitoring to record the status of the item being monitored. To stop recording,
touch “STOP ”.

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All Signals, Main Signals, Selection From Menu
NOTE:

Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is in ACC posi-
tion, display may not be correct.

(*1) This item is displayed, but does not function.
ACTIVE TEST
Operation Procedure
1. Touch “ACTIVE TEST” on “SELECT DIAG-MODE ” screen.
2. Touch item to be tested, and check operation.
3. Touch “START”.
4. Touch "STOP" while testing to stop the operation.
Item name CONSULT-II
screen display Display or unit Monitor item selection
Description
ALL
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
Motor fan request MOTOR FAN
REQ
1/2/3/4
X X X Signal status input from ECM
Compressor
request AC COMP REQ ON/OFF
X XX Signal status input from ECM
Parking, license,
and tail lamp
request TAIL & CLR REQ ON/OFF
X XX Signal status input from BCM
Headlamp low
beam request HL LO REQ ON/OFF
X XX Signal status input from BCM
Headlamp high
beam request HL HI REQ ON/OFF
X XX Signal status input from BCM
Front fog request FR FOG REQ ON/OFF X XX Signal status input from BCM
Front wiper
request FR WIP REQSTOP/1LOW/
LOW/HI
X X
X Signal status input from BCM
Wiper auto stop WIP AUTO
STOPACT P/STOP P X X
X Output status of IPDM E/R
Wiper protection WIP PROT OFF/Block X XX Control status of IPDM E/R
Starter request ST RLY REQ ON/OFF XX
Status of input signal
NOTE
Ignition relay
status IGN RLY ON/OFF
X XXIgnition relay status monitored
with IPDM E/R
Rear defogger
request RR DEF REQ ON/OFF
X XX Signal status input from BCM
Oil pressure
switch OIL P SW (*1) OPEN/CLOSE X
XSignal status input from IPDM
E/R
Hood switch HOOD SW OFF XSignal status input from IPDM
E/R
Theft warning
horn request THFT HRN REQ ON/OFF
XX Signal status input from BCM
Horn chirp HORN CHIRP ON/OFF XX Output status of IPDM E/R
Daytime running
lamp request DTRL REQ ON/OFF
XX Signal status input from BCM
Test nameCONSULT-II screen display Description
Rear defogger output REAR DEFOGGER With a certain ON-OFF operation, the rear defogger relay can be oper-
ated.
Front wiper (HI, LO) output FRONT WIPER With a certain operation (OFF, HI ON, LO ON), the front wiper relay
(Lo, Hi) can be operated.
Cooling fan output MOTOR FAN With a certain operation (1, 2, 3, 4), the cooling fan can be operated.