2007 INFINITI QX56 engine

WATER PUMP
CO-19
< SERVICE INFORMATION >
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• Check for leaks of engine coolant. Refer to CO-9, "Inspection".
• Start and warm up engine. Visually check for leaks of the engine coolant.

CO-20
< SERVICE INFORMATION >
THERMOSTAT AND WATER PIPING
THERMOSTAT AND WATER PIPING
Removal and InstallationINFOID:0000000003531576
REMOVAL
Removal of Thermostat
1. Drain engine coolant from the radiator. Refer to CO-9, "Changing Engine Coolant".
CAUTION:
Perform when engine is cold.
2. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation".
3. Remove the engine room cover using power tool.
4. Disconnect the water suction hose from the water inlet.
5. Remove the water inlet and thermostat.
Removal of Thermostat Housing, Water Outlet and Heater Pipe
1. Remove the intake manifold. Refer to EM-17, "Removal and Installation".
2. Remove the thermostat housing, water outlet and heater pipe.
Removal of Water Cut Valve
1. Drain the engine coolant from the radiator. Refer to CO-9, "Changing Engine Coolant".
CAUTION:
Perform when the engine is cold.
2. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation".
KBIA2501E
1. Heater pipe 2. Gasket 3. Water outlet
4. Gasket 5. O-ring 6. O-ring
7. Thermostat housing 8. Rubber ring 9. Thermostat
10. Water inlet 11. Water suction hose 12. Water suction pipe
13. Gasket 14. Heater pipe

THERMOSTAT AND WATER PIPING
CO-21
< SERVICE INFORMATION >
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3. Remove the engine room cover using power tool.
4. Disconnect the heater hose (heater core side).
5. Remove the heater hose bracket.
6. Disconnect the water cut valve connector.
7. Remove the water cut valve.
INSPECTION AFTER REMOVAL
• Place a thread so that it is caught in the valve of the thermostat.
Immerse fully in a container filled with water. Heat while stirring.
• The valve opening temperature is the temperature at which the
valve opens and falls from the thread.
• Continue heating. Check the full-open lift amount.
• After checking the full-open lift amount, lower the water tempera-
ture and check the valve closing temperature.
Standard values:
INSTALLATION
Installation is in the reverse order of removal.
Installation of Thermostat
• Install the thermostat with the whole circumference of each flange
part fit securely inside the rubber ring as shown.
• Install the thermostat with the jiggle valve facing upwards.
Installation of Water Outlet Pipe and Heater Pipe
First apply a neutral detergent to the O-rings, then quickly insert the insertion parts of the water outlet pipe and
heater pipe into the installation holes.
INSPECTION AFTER INSTALLATION
• Check for leaks of the engine coolant. Refer to CO-9, "Inspection".
• Start and warm up the engine. Visually check for leaks of the engine coolant.
SLC252B
Thermostat
Valve opening temperature 80 - 84°C (176 - 183° F)
Full-open lift amount More than 10 mm/ 95°C (0.39 in/ 203°F)
Valve closing temperature 77°C (171°F) or higher
KBIA2502E

CO-22
< SERVICE INFORMATION >
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Standard and LimitINFOID:0000000003531577
ENGINE COOLANT CAPACITY (APPROXIMATE)
Unit: (US gal, Imp gal)
THERMOSTAT
RADIATOR
Unit: kPa (kg/cm2, psi)
Engine coolant capacity with reservoir tank ("MAX" level) 14.4 (3 3/4, 3 1/8)
Valve opening temperature 80 - 84°C (176 - 183°F)
Maximum valve lift More than 10 mm/95°C (0.39 in/203°F)
Valve closing temperature 77°C (171°F) or higher
Reservoir cap relief pressure Standard 95 - 125 (0.97- 1.28, 14 - 18)
Leakage test pressure 137 (1.4, 20)

DI-1
ELECTRICAL
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CONTENTS
DRIVER INFORMATION SYSTEM
SERVICE INFORMATION .. ..........................3
PRECAUTION ................................................ .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
PREPARATION ...................................................4
Commercial Service Tool .................................... ......4
COMBINATION METERS ...................................5
Component Parts and Harness Connector Loca-
tion ...................................................................... ......
5
System Description ...................................................5
Arrangement of Combination Meter ..........................7
Internal Circuit ...........................................................8
Wiring Diagram - METER - .......................................9
Combination Meter Harness Connector Terminal
Layout .....................................................................
11
Terminal and Reference Value for Combination
Meter .......................................................................
11
Self-Diagnosis Mode of Combination Meter ........ ....12
How to Proceed with Trouble Diagnosis ............. ....15
Preliminary Check ...................................................15
Symptom Chart .......................................................16
Power Supply and Ground Circuit Inspection .........16
Vehicle Speed Signal Inspection .............................17
Engine Oil Pressure Signal Inspection ....................17
Water Temperature Signal Inspection .....................18
Engine Speed Signal Inspection ......................... ....18
Fuel Level Sensor Unit Inspection ...................... ....18
Fuel Gauge Fluctuates, Indicates Wrong Value, or
Varies .................................................................. ....
20
Fuel Gauge Does Not Move to Full-position ...........20
Electrical Component Inspection ......................... ....21
Removal and Installation of Combination Meter .....21
COMPASS AND THERMOMETER ................ ....22
System Description ............................................. ....22
Wiring Diagram - COMPAS - ..................................23
Trouble Diagnosis ............................................... ....23
Calibration Procedure for Compass .................... ....24
WARNING LAMPS ............................................26
Schematic ............................................................ ....26
Wiring Diagram - WARN - .......................................27
Oil Pressure Warning Lamp Stays Off (Ignition
Switch ON) .......................................................... ....
32
Oil Pressure Warning Lamp Does Not Turn Off
(Oil Pressure Is Normal) ...................................... ....
33
A/T INDICATOR ................................................34
Wiring Diagram - AT/IND - .......................................34
A/T Indicator Does Not Illuminate ............................34
WARNING CHIME .............................................36
Component Parts and Harness Connector Loca-
tion ....................................................................... ....
36
System Description ..................................................36
CAN Communication System Description ...............37
Wiring Diagram - CHIME - .......................................38
Terminal and Reference Value for BCM ..................39
Terminal and Reference Value for Combination
Meter ................................................................... ....
39
How to Proceed with Trouble Diagnosis ..................40
Preliminary Check ............................................... ....40
CONSULT-II Function (BCM) ..................................40
All Warning Chimes Do Not Operate .......................41
Key Warning Chime and Light Warning Chime Do
Not Operate (Seat Belt Warning Chime Does Op-
erate) .......................................................................
41
Key Warning Chime Does Not Operate ...................42
Light Warning Chime Does Not Operate .................44
Seat Belt Warning Chime Does Not Operate ..........44
REAR SONAR SYSTEM ...................................46
Component Parts and Harness Connector Loca-
tion ....................................................................... ....
46
System Description ..................................................46
Wiring Diagram - SONAR - ......................................48
Sonar Control Unit Harness Connector Terminal
Layout ......................................................................
50

DI-6
< SERVICE INFORMATION >
COMBINATION METERS
POWER SUPPLY AND GROUND CIRCUIT
Power is supplied at all times
• through 10A fuse [No.19, located in the fuse block (J/B)]
• to combination meter terminal 8.
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.
Ground is supplied
• to combination meter terminal 17
• through body grounds M57, M61 and M79.
WATER TEMPERATURE GAUGE
The water temperature gauge indicates the engine coolant temperature.
ECM provides an engine coolant temperature signal to combination meter via CAN communication lines.
ENGINE OIL PRESSURE GAUGE
The engine oil pressure gauge indicates whether the engine oil pressure is low or normal.
The oil pressure gauge is controlled by the IPDM E/R (intelligent power distribution module engine room). Low
oil pressure causes oil pressure switch terminal 1 to provide ground to IPDM E/R terminal 42. The IPDM E/R
then signals the combination meter (unified meter control unit) via CAN communication lines and a low oil
pressure indication is displayed by the oil pressure gauge.
A/T OIL TEMPERATURE GAUGE
The A/T oil temperature gauge indicates the A/T fluid temperature.
TCM (transmission control module) provides an A/T flui d temperature signal to combination meter via CAN
communication lines.
VOLTAGE GAUGE
The voltage gauge indicates the battery/charging system voltage.
The voltage gauge is regulated by the unified meter control unit.
TA C H O M E T E R
The tachometer indicates engine speed in revolutions per minute (rpm).
ECM provides an engine speed signal to combination meter via CAN communication lines.
FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by the unified meter control unit and a variable resistor signal supplied
• to combination meter terminal 15.
• through fuel level sensor unit and fuel pump terminal 2
• through fuel level sensor unit and fuel pump terminal 5
• from combination meter terminal 16
SPEEDOMETER
ABS actuator and electric unit (contro l unit) provides a vehicle speed signal to the combination meter via CAN
communication lines.
ODO/TRIP METER
The vehicle speed signal and the memory signals from the meter memory circuit are processed by the combi-
nation meter and the mileage is displayed.
How to Change the Display
Refer to Owner's Manual for odo/tr ip meter operating instructions.
CAN COMMUNICATION SYSTEM DESCRIPTION
Refer to LAN-4.

DI-12
< SERVICE INFORMATION >
COMBINATION METERS
Self-Diagnosis Mode of Combination Meter
INFOID:0000000003533486
SELF-DIAGNOSIS FUNCTION
The following items can be checked during Combination Meter Self-Diagnosis Mode.
• Gauge sweep and present gauge values.
• Illuminates all odometer, fuel, and engine temperature segments.
• Illuminates all micro controlled lamps/LE D's regardless of switch configuration.
• Displays estimated present battery voltage.
• Displays seat belt buckle switch LH status.
HOW TO INITIATE COMBINATION METER SELF- DIAGNOSIS MODE
NOTE:
Once entered, Combination Meter Self-Diagnosis Mode will function with the ignition switch in ON or START.
Combination Meter Self-Diagnosis Mode will exit upon turning the ignition switch to OFF or ACC.
To initiate Combination Meter Self-Diagnosis Mode, refer to the following procedure.
1. Turn the ignition switch ON, while holding the odom eter/trip meter switch for 5 - 8 seconds. When the
diagnosis function is activated the odometer/trip meter will display tESt.
NOTE:
Check combination meter power supply and ground ci rcuit when self-diagnosis mode of combination
meter does not start. Refer to DI-16, "
Power Supply and Ground Circuit Inspection". Replace combination
meter if normal. Refer to IP-10, "
Removal and Installation".
COMBINATION METER SELF-DIAGNOSIS MODE FUNCTIONS
To interpret Combination Meter Self-Diagnosis Mode functions, refer to the following table.
37 W/L Washer fluid level switch ON Washer fluid level low 0
Washer fluid level normal Battery voltage
Te r m i n a l
No. Wire
color Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
Event Odometer Display Description of Test/Data Notes:
Odometer/trip meter A/B
switch held from 5 to 8
seconds (or until re-
leased) tESt Initiating self-diagnosis mode
Odometer/trip meter A/B
switch engaged and re-
leased = next test re-
quested rXXXX, FAILReturn to normal opera-
tion of all lamps/LEDs and
displays hex ROM rev. If a
ROM checksum fault ex-
ists, display alternates be-
tween "r XXXX" and
"FAIL".
Next test requested nrXXXX Displays hex ROM rev as
stored in NVM.
Next test requested Sc1XX Displays 8-bit software
configuration value in Hex
format.Bit Coding
7-3 = reserved for future use
2 = TCS/VDC 0 = not present
1 = present
1 = Shift type 0 = Column shift
1 = Floor shift
0 = ICC 0 = not present
1 = present
Next test requested Sc2XX Displays 8-bit software
configuration value in Hex
format.Bit coding
7-0 = Reserved for future use

COMBINATION METERSDI-13
< SERVICE INFORMATION >
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Next test requested EprXX Displays 8-bit software
configuration value in Hex
format.Bit Coding
7-2 = reserved for future use
1 = A/T Oil Temp (gauge)
0 = not present
1 = present
1 = Odo Units 0 = kilometers
1 = miles
Next test requested 1nFXX Displays 8-bit market info
value in Hex format.$31 = USA
$2A = Canada
Next test requested cYLXX Displays 8-bit engine con-
figuration value in Hex for-
mat.$08 = 8 cylinder
$06 = 6 cylinder
Next test requested bulb Illuminates all micro-con-
trolled lamps/LEDs re-
gardless of SW
configuration.
Next test requested D-HI Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Full daytime brightness all LCD
segments active
Next test requested N-HI Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Full nighttime brightness all
LCD segments active
Next test requested N-LO Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Min. nighttime brightness all
LCD segments active
Next test requested dS XX Current dimming step. 1-21
Next test requested EE XX, FAIL Hex EE level. If EE check-
sum fault exists, display
alternates between "EE
XX" and "FAIL".
Next test requested dtXXXX Hex coding of final manu-
facturing test date.
Next test requested GAGE Performs sweep of all
gauges, then displays
present gauge values.
Performs checksum tests
on ROM and EE.Gauges sweep within 10 sec-
onds
Next test requested FFXXXX Displays 16-bit fuel flow
constant "Q" in tenths of
cc/min in Hex format.$0000 - $FFFF
Next test requested tF Displays 16-bit tire factor
"A" in hundredths in Hex
format.$0000 - $FFFF
Next test requested oP Current oil pressure value
in A/D counts in hex for-
mat.
$00 - $FF
Next test requested ot1XX Displays oil pressure tell-
tale "on" threshold in A/D
counts in Hex format.$00 - $FF
Event Odometer Display Description of Test/Data Notes: