2011 INFINITI QX56 Cooling

ENGINE COOLANTCO-9
< PERIODIC MAINTENANCE >
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3. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to CO-10, "
Flushing".
RefillingINFOID:0000000006289659
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring. Refer to CO-13, "
Exploded View".
If water drain plug on cylinder block is removed, close and tighten it. Refer to EM-107, "
Disassem-
bly and Assembly".
2. Check that each hose clamp is firmly tightened.
3. Remove air relief plug (1) on heater hose.
4. Fill radiator, and reservoir tank, to specified level. Pour engine coolant through engine coolant filler neck
slowly of less than 3 (2-5/8 lmp qt) a minute to allow air
in system to escape.
 Use Genuine NISSAN Long Li fe Antifreeze/Coolant or
equivalent mixed with water (dis tilled or demineralized).
Refer to MA-10, "
Fluids and Lubricants".
5. When engine coolant overflows air relief hole on heater hos e, install air relief plug with clamp. Then refill
radiator with engine coolant.
6. Install radiator cap.
7. Install reservoir tank cap.
8. Warm up engine until opening thermostat less than 3,000 rpm.  Check thermostat opening condition by touching radiat or hose (lower) to see a flow of warm water.
CAUTION: : 1.96 N·m (0.2 kg-m, 17 in-lb)
2. Engine cover
: Vehicle front
JPBIA3429ZZ
Engine coolant capacity : Refer to CO-23,
"PeriodicalMaintenanceS
pecification".
(With reservoir tank at
“MAX” level)JPBIA0412ZZ
Reservoir tank engine
coolant capacity :Refer to
CO-23,
"PeriodicalMaintenanceSp
ecification".
(At “MAX” level)
A : MAX
B: MIN
JPBIA0102ZZ
Revision: 2010 May2011 QX56

CO-10
< PERIODIC MAINTENANCE >
ENGINE COOLANT
Watch water temperature gauge so as not to overheat engine.
9. Stop the engine and cool down to less than approximately 50 °C (122 °F).
 Cool down using fan to reduce the time.
 If necessary, refill radiator up to filler neck with engine coolant.
10. Refill reservoir tank to “MAX” level line with engine coolant if necessary.
11. Repeat steps 6 through 10 two or more times with reservoir tank cap installed until engine coolant level no longer drops.
12. Check cooling system for leakage with engine running.
13. Warm up the engine, and check for sound of engine coolant flow while running engine from idle up to 3,000 rpm with heater temperature controller set at several position between “COOL” and “WARM”.
 Sound may be noticeable at heater unit.
14. Repeat step 13 three times.
15. If sound is heard, bleed air from cooling system by repeating step 4, and steps from 6 to 14 until engine
coolant level no longer drops.
FlushingINFOID:0000000006289660
1. Install reservoir tank if removed, and radiator drain plug. CAUTION:
Be sure to clean drain plug and install with new O-ring. Refer to CO-13, "
Exploded View".
If water drain plug on cylinder block is removed, close and tighten it. Refer to EM-107, "
Disassem-
bly and Assembly".
2. Remove air relief plug (1) on heater hose.
3. Fill radiator and reservoir tank with water until water spills from the air relief holes, then close air relief
plugs with clamp. Fill radiator and reservoir tank with water and reinstall caps.
4. Run the engine and warm it up to normal operating temperature.
5. Rev the engine two or three times under no-load.
6. Stop the engine and wait until it cools down.
7. Drain water from the system. Refer to CO-8, "
Draining".
8. Repeat steps 1 through 7 until clear water begins to drain from radiator. : 1.96 N·m (0.2 kg-m, 17 in-lb)
2. Engine cover
: Vehicle front
JPBIA3429ZZ
Revision: 2010 May2011 QX56

RADIATORCO-11
< PERIODIC MAINTENANCE >
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RADIATOR
RESERVOIR TANK CAP
RESERVOIR TANK CAP : InspectionINFOID:0000000006289661
 Check valve seat of reservoir tank cap.
- Check if valve seat (A) is swollen to the extent that the edge of the
metal plunger (B) cannot be seen when watching it vertically from
the top.
- Check if valve seat has no soil and damage.
 Pull negative-pressure valve to open it, and check that it close completely when released.
- Check that there is no dirt or dam age on the valve seat of reservoir
tank cap negative-pressure valve.
- Check that there are no unusualness in the opening and closing conditions of negative-pressure valve.
 Check reservoir tank cap relief pressure.
- When connecting reservoir tank cap to the radiator cap tester (commercial service tool) and the r adiator cap tester adapter (com-
mercial service tool) (A), apply engine coolant to the cap seal sur-
face.
 Replace reservoir tank cap if there is an unusualness related to the above three.
CAUTION:
When installing reservoir tank cap , thoroughly wipe out the water inlet filler neck to remove any waxy
residue or foreign material.
RADIATOR
RADIATOR : InspectionINFOID:0000000006289662
Check radiator for mud or clogging. If neces sary, clean radiator as per the following:
 Be careful not to bend or damage radiator fins.
 When radiator is cleaned without removal, remove all surrounding parts such as radiator cooling fan shroud. Then tape harness and connectors to prevent water from entering.
1. Apply water by hose to the back side of the radiator core vertically downward.
2. Apply water again to all radiator core surfaces once per minute.
JPBIA0108ZZ
SMA967B
Standard and limit : Refer to CO-23, "Radiator".
JPBIA0109ZZ
Revision: 2010 May2011 QX56

CO-14
< REMOVAL AND INSTALLATION >
RADIATOR
to release built-up pressure. Carefully remove radiator cap by turning it all the way. Note that the reser-
voir tank cap side is also under pressure.
1. Remove front under cover with power tool. Refer to EXT-25, "
Exploded View".
2. Remove engine cover. Refer to EM-25, "
Exploded View".
3. Drain engine coolant from radiator. Refer to CO-8, "
Draining".
CAUTION:
 Perform this step when the engine is cold.
 Never spill engine coolant on drive belts.
4. Remove radiator hose (lower).
5. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
6. Move reservoir tank to the position without the hindrance for work.
7. Remove radiator core support cover. Refer to DLK-220, "
Exploded View".
8. Remove fan shroud (upper), refer to following.
a. Remove EVAP hose mounting bolts and move harness to aside.
b. Move air cleaner case to the position without the hindrance for work. Refer to EM-27, "
Exploded View".
NOTE:
The air cleaner case connector is not required to be disconnected.
9. Remove radiator grille. Refer to EXT-19, "
Exploded View".
10. Move condenser to the position without the hindranc e for work with the following procedures. Refer to HA-
38, "Exploded View".
 Remove mounting bolts and disconnect A/C piping from radiator.
 Remove air guide from radiator. Refer to EXT-12, "
Exploded View".
 Remove radiator mounting bolts.
11. Remove radiator hose (upper).
12. Remove radiator as per the following: CAUTION:
Be careful not to damage radiator core.
 Lift up and pull the radiator (1) forward, and then remove themounting rubber (lower) (3) from the radiator core support (2).
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
 Use genuine mounting bolts for th e cooling fan assembly and strictly observe the tightening torque.
(Breakage prevention for radiator)
NOTE:
 Insert the radiator hose (1) all the way to the st opper (2) or by 33 mm (1.30 in) (hose without a stopper).
: Vehicle front
JPBIA3431ZZ
JPBIA4294GB
Revision: 2010 May2011 QX56

CO-16
< REMOVAL AND INSTALLATION >
COOLING FAN
COOLING FAN
Exploded ViewINFOID:0000000006289666
Removal and InstallationINFOID:0000000006289667
REMOVAL
1. Remove front under cover with power tool. Refer to EXT-25, "Exploded View".
2. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
3. Move reservoir tank to the position without the hindrance for work, refer to following.
 Remove fixed bolts
 Remove reservoir tank hose clamp.
4. Remove radiator core support cover. Refer to DLK-220, "
Exploded View".
5. Remove fan shroud (upper), refer to following.  Remove EVAP hose.
 Remove fan shroud (upper) mounting bolts. Refer to CO-13, "
Exploded View".
 Move air cleaner to the position without the hindrance for work.
 Remove engine cover. Refer to EM-25, "
Exploded View".
6. Remove cooling fan.
7. Remove drive belt. Refer to EM-20, "
Exploded View".
8. Disconnect fan coupling harness connector.
9. Remove fan coupling.
10. Remove bracket.
11. Remove cooling fan pulley.
12. Remove Idler pulley.
1. Fan bracket 2. Cooling fan pulley 3. Fan coupling
4. Bracket 5. Cooling fan
Refer to GI-4, "
Components" for symbols not described on the above.
JPBIA3326GB
Revision: 2010 May2011 QX56

COOLING FANCO-17
< REMOVAL AND INSTALLATION >
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13. Remove the fan bracket, refer to following.
 Disconnect A/C compressor harness connector. Refer to HA-30, "
Exploded View".
 Remove A/C compressor mounting bolt. Refer to HA-30, "
Exploded View".
 Remove fan bracket mounting bolt.
INSTALLATION
Installation is in the reverse order of removal.
InspectionINFOID:0000000006289668
INSPECTION AFTER REMOVAL
Fan Coupling
Inspect fan coupling for oil leakage and bimetal conditions.
Fan Bracket
 Visually check that there is no significant looseness in the fan bracket shaft, and that it turns smoothly by hand.
 If there are any unusual concerns, replace the cooling fan pulley.
INSPECTION AFTER INSTALLATION
 Check for leaks of the engine coolant. Refer to CO-8, "Inspection".
 Start and warm up the engine. Visually make sure that there are no leaks of the engine coolant.
SLC072
WBIA0418E
Revision: 2010 May2011 QX56

CO-18
< REMOVAL AND INSTALLATION >
WATER PUMP
WATER PUMP
Exploded ViewINFOID:0000000006289669
Removal and InstallationINFOID:0000000006289670
CAUTION:
 When removing water pump assembly, be careful not to get engine coolant on drive belts.
 Water pump cannot be disassembled and should be replaced as a unit.
 After installing water pump, co nnect hose and clamp securely, then check for leakage using the radi-
ator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service
tool).
REMOVAL
1. Drain engine coolant from drain plugs on radiator and cylinder block. Refer to CO-8, "Draining" and EM-
103, "Setting".
CAUTION:
 Perform this step when engine is cold.
 Never spill engine coolant on drive belt.
2. Remove front under cover with power tool. Refer to EXT-25, "
Exploded View".
3. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
4. Move reservoir tank to the position with out the hindrance for work. Refer to CO-13, "
Exploded View".
5. Remove radiator core support cover. Refer to DLK-220, "
Exploded View".
6. Remove fan shroud (upper). Refer to CO-13, "
Exploded View".
7. Remove drive belt. Refer to EM-20, "
Exploded View".
8. Remove cooling fan, fan coupling, cooling fan pulley and bracket. Refer to CO-16, "
Exploded View"
9. Remove radiator hose (upper). Refer to CO-13, "Exploded View".
10. Remove water pump pulley.
1. Water pump pulley 2. Water pump 3. Gasket
Refer to GI-4, "
Components" for symbols in the figure.
JPBIA2316GB
Revision: 2010 May2011 QX56

DAS
C1B03 ABNRML TEMP DETECTDAS-365
< DTC/CIRCUIT DIAGNOSIS > [LDW & LDP]
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C1B03 ABNRML TEMP DETECT
ADAS CONTROL UNIT
ADAS CONTROL UNIT : DTC LogicINFOID:0000000006223771
DTC DETECTION LOGIC
ADAS CONTROL UNIT : Diagnosis ProcedureINFOID:0000000006223772
1.CHECK LANE CAMERA UNIT SELF-DIAGNOSIS RESULTS
1. Perform “All DTC R eading” with CONSULT-III.
2. Check if the “C1B03” is detected in “Self Diagnostic Result” of “LANE CAMERA”
Is
“C1B03” detected?
YES >> Refer to DAS-365, "LANE CAMERA UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ADAS CONTROL UNIT SELF-DIAGNOSIS RESULTS
1. Erase all self-diagnosis results with CONSULT-III.
2. Perform “All DTC Reading”.
3. Check if the “C1B03” is detected in “Self Diagnostic Result” of “ICC/ADAS”
Is
“C1B03” detected?
YES >> Replace the ADAS control unit. Refer to DAS-63, "Removal and Installation".
NO >> INSPECTION END
LANE CAMERA UNIT
LANE CAMERA UNIT : DTC LogicINFOID:0000000006223773
DTC DETECTION LOGIC
LANE CAMERA UNIT : Diagnosis ProcedureINFOID:0000000006223774
1.COOLING LANE CAMERA UNIT
1. Wait for 10 minutes or more to cool the lane camera unit.
2. Erase All self-diagnosis results with CONSULT-III.
3. Perform “All DTC Reading”.
4. Check if the “C1B03” is detected in “Self Diagnostic Result” of “LANE CAMERA”.
Is
“C1B03” detected?
YES >> Replace the lane camera unit. Refer to DAS-403, "Removal and Installation".
NO >> INSPECTION END
DTC
(On board
display) Trouble diagnosis name DTC detecting condition Possible causes
C1B03 (83) CAM ABNRML TMP DETCT
Temperature around lane camera unit is ex-
cessively high Interior room temperature is exces-
sively high
DTC Trouble diagnosis name DTC detecting condition Possible causes
C1B03 ABNRML TEMP DETECT Temperature around lane camera unit is ex-
cessively high Interior room temperature is exces-
sively high
Revision: 2010 May2011 QX56