vin INFINITI QX4 2001 Factory Service Manual

RHA060GB
COMPONENT INSPECTIONNBHA0045In-vehicle SensorNBHA0045S01After disconnecting in-vehicle sensor harness connector, measure
resistance between terminals 1 and 2 at sensor harness side, using
the table below.
Temperature ÉC (ÉF) Resistance kW
þ15 (5) 12.73
þ10 (14) 9.92
þ5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
If NG, replace in-vehicle sensor.
RHA639F
Sunload Sensor Circuit
COMPONENT DESCRIPTIONNBHA0046The sunload sensor is located on the right defroster grille. It detects
sunload entering through windshield by means of a photo diode.
The sensor converts the sunload into a current value which is then
input into the auto amplifier.
SUNLOAD INPUT PROCESSNBHA0047The auto amp. also includes a processing circuit which ªaverageº
the variations in detected sunload over a period of time. This pre-
vents drastic swings in the ATC system operation due to small or
quick variations in detected sunload.
For example, consider driving along a road bordered by an occa-
sional group of large trees. The sunload detected by the sunload
sensor will vary whenever the trees obstruct the sunlight. The pro-
cessing circuit averages the detected sunload over a period of
time, so that the (insignificant) effect of the trees momentarily
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TROUBLE DIAGNOSES
In-vehicle Sensor Circuit (Cont'd)
HA-135

Compressor Clutch
OVERHAULNBHA0073
RHA122F
RHA136EB
REMOVALNBHA0074IWhen removing center bolt, hold clutch disc with clutch disc
wrench.
RHA399F
RHA124F
IRemove the clutch disc using the clutch disc puller.
Insert the holder's three pins into the holes in the clutch disc.
Rotate the holder clockwise to hook it onto the plate. Then,
tighten the center bolt to remove the clutch disc.
After removing the clutch disc, remove the shims from either
the drive shaft or the clutch disc.
SERVICE PROCEDURE
Compressor Clutch
HA-150

RHA138E
IRemove the snap ring using external snap ring pliers.
RHA139E
IPulley removal
Position the center pulley puller on the end of the drive shaft,
and remove the pulley assembly using any commercially avail-
able pulley puller.
To prevent the pulley groove from being deformed, the
puller claws should be positioned onto the edge of the
pulley assembly.
RHA125F
IRemove the field coil harness clip using a pair of pliers.
RHA145E
IRemove the snap ring using external snap ring pliers.
RHA126F
INSPECTIONNBHA0075Clutch DiscNBHA0075S01If the contact surface shows signs of damage due to excessive
heat, replace clutch disc and pulley.
PulleyNBHA0075S02Check the appearance of the pulley assembly. If the contact sur-
face of pulley shows signs of excessive grooving, replace clutch
disc and pulley. The contact surfaces of the pulley assembly should
be cleaned with a suitable solvent before reinstallation.
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SERVICE PROCEDURE
Compressor Clutch (Cont'd)
HA-151

CHECKING FOR REFRIGERANT LEAKS=NBHA0078IPerform a visual inspection of all refrigeration parts, fittings,
hoses and components for signs of A/C lubricant leakage,
damage and corrosion. A/C lubricant leakage may indicate an
area of refrigerant leakage. Allow extra inspection time in these
areas when using either an electronic refrigerant leak detector
or fluorescent dye leak detector.
IIf dye is observed, confirm the leak with an electronic refriger-
ant leak detector. It is possible a prior leak was repaired and
not properly cleaned.
IWhen searching for leaks, do not stop when one leak is found
but continue to check for additional leaks at all system compo-
nents and connections.
IWhen searching for refrigerant leaks using an electronic leak
detector, move the probe along the suspected leak area at 1
to 2 inches per second and no further than 1/4 inch from the
component.
NOTE:
Moving the electronic leak detector probe slower and closer to
the suspected leak area will improve the chances of finding a
leak.
CHECKING SYSTEM FOR LEAKS USING THE
FLUORESCENT LEAK DETECTOR
NBHA01161. Check A/C system for leaks using the UV lamp and safety
glasses (J-42220) in a low sunlight area (area without windows
preferable). Illuminate all components, fittings and lines. The
dye will appear as a bright green/yellow area at the point of
leakage. Fluorescent dye observed at the evaporator drain
opening indicates an evaporator core assembly (tubes, core or
TXV) leak.
2. If the suspected area is difficult to see, use an adjustable mir-
ror or wipe the area with a clean shop rag or cloth, then check
the cloth with the UV lamp for dye residue.
3. After the leak is repaired, remove any residual dye using dye
cleaner (J-43872) to prevent future misdiagnosis.
4. Perform a system performance check and verify the leak repair
with an approved electronic refrigerant leak detector.
NOTE:
IOther gases in the work area or substances on the A/C
components, for example, anti-freeze, windshield washer
fluid, solvents and lubricants, may falsely trigger the leak
detector. Make sure the surfaces to be checked are clean.
Clean with a dry cloth or blow off with shop air.
IDo not allow the sensor tip of the detector to contact with
any substance. This can also cause false readings and
may damage the detector.
DYE INJECTIONNBHA0117(This procedure is only necessary when re-charging the system or
when the compressor has seized and was replaced.)
1. Check A/C system static (at rest) Pressure. Pressure must be
at least 345 kPa (50 psi).
2. Pour one bottle (1/4 ounce /7.4 cc) of the A/C refrigerant dye
into the injector tool (J-41459).
3. Connect the injector tool to the A/C LOW PRESSURE side
service fitting.
4. Start engine and switch A/C ON.
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SERVICE PROCEDURE
Refrigerant Lines (Cont'd)
HA-155

SHA708EA
3. Move probe along component approximately 25 to 50 mm (1
to 2 in)/sec.
Checking ProcedureNBHA0115S02To prevent inaccurate or false readings, make sure there is no
refrigerant vapor, shop chemicals, or cigarette smoke in the
vicinity of the vehicle. Perform the leak test in calm area (low
air/wind movement) so that the leaking refrigerant is not dis-
persed.
1. Turn engine off.
2. Connect a suitable A/C manifold gauge set to the A/C service
ports.
3. Check if the A/C refrigerant pressure is at least 345 kPa (3.52
kg/cm
2, 50 psi) above 16ÉC (61ÉF). If less than specification,
recover/evacuate and recharge the system with the specified
amount of refrigerant.
NOTE:
At temperatures below 16ÉC (61ÉF), leaks may not be detected
since the system may not reach 345 kPa (3.52 kg/cm
2, 50 psi).
4. Conduct the leak test from the high side (compressor dis-
chargeato evaporator inletf) to the low side (evaporator drain
hosegto shaft sealk). Refer to HA-154. Perform a leak check
for the following areas carefully. Clean the component to be
checked and move the leak detector probe completely around
the connection/component.
ICompressor
Check the fitting of high and low pressure hoses, relief valve
and shaft seal.
ILiquid tank
Check the pressure switch, tube fitting, weld seams and the
fusible plug mount.
IService valves
Check all around the service valves. Ensure service valve caps
are secured on the service valves (to prevent leaks).
NOTE:
After removing A/C manifold gauge set from service valves, wipe
any residue from valves to prevent any false readings by leak
detector.
ICooling unit (Evaporator)
With engine OFF, turn blower fan on ªHighº for at least 15
seconds to dissipate any refrigerant trace in the cooling unit.
Wait a minimum of 10 minutes accumulation time (refer to the
manufacturer's recommended procedure for actual wait time)
before inserting the leak detector probe into the drain hose.
Keep the probe inserted for at least ten seconds. Use caution
not to contaminate the ptobe tip with water or dirt that may be
in the drain hose.
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SERVICE PROCEDURE
Refrigerant Lines (Cont'd)
HA-157

COMMERCIAL SERVICE TOOLNBLC0040
Tool name Description
Deep socket
NT818
Removing and installing oil pressure switch
Deep socket 26 mm, 3/8 drive
Lubrication CircuitNBLC0003
SLC350BA
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ENGINE LUBRICATION SYSTEM
Preparation (Cont'd)
LC-3

b. Apply Genuine RTV silicone sealant Part No. 999MP-A7007 or
equivalent to the thread and tighten.
13 - 17 N´m (1.25 - 1.75 kg-m,9-12ft-lb)
Oil Pump
REMOVAL AND INSTALLATIONNBLC00051. Remove timing chain. Refer to EM-23, ªRemovalº.
2. Remove oil pump assembly.
IInspect the oil pump after removing it.
3. Reinstall any parts removed in reverse order of removal.
DISASSEMBLY AND ASSEMBLYNBLC0006
SLC323B
IWhen installing oil pump, apply engine oil to rotors.
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ENGINE LUBRICATION SYSTEM
Oil Pressure Check (Cont'd)
LC-5

IInspect the oil cooler after removing it.
SLC333B
3. Installation is in reverse order of removal.
IWhen installing the oil cooler, align the oil cooler stopper
with the stopper of the oil cooler bracket.
INSPECTIONNBLC0037Oil CoolerNBLC0037S011. Check oil cooler for cracks.
2. Check oil cooler for clogging by blowing through coolant inlet.
If necessary, replace oil cooler assembly.
Oil Pressure Relief ValveNBLC0037S02Inspect oil pressure relief valve for movement, cracks and breaks
by pushing the ball. If replacement is necessary, remove valve by
prying it out with a suitable tool. Install a new valve in place by
tapping it.
Service Data and Specifications (SDS)
OIL PRESSURENBLC0010
Engine speed
rpmApproximate discharge pressure
kPa (kg/cm2, psi)
Idle speed
2,000More than 98 (1.0, 14)
294 (3.0, 43)
REGULATOR VALVENBLC0011Unit: mm (in)
Regulator valve to oil pump cover clearance 0.040 - 0.097 (0.0016 - 0.0038)
OIL PUMPNBLC0012Unit: mm (in)
Body to outer rotor radial clearance 0.114 - 0.200 (0.0045 - 0.0079)
Inner rotor to outer rotor tip clearance Below 0.18 (0.0071)
Body to inner rotor axial clearance 0.030 - 0.070 (0.0012 - 0.0028)
Body to outer rotor axial clearance 0.050 - 0.110 (0.0020 - 0.0043)
Inner rotor to brazed portion of housing clearance 0.045 - 0.091 (0.0018 - 0.0036)
ENGINE LUBRICATION SYSTEM
Oil Cooler (Cont'd)
LC-8

SEM164F
AEM080
Precautions
LIQUID GASKET APPLICATION PROCEDURENBLC00131. Use a scraper to remove all traces of old liquid gasket from
mating surfaces and grooves. Also, completely clean any oil
from these areas.
2. Apply a continuous bead of liquid gasket to mating surfaces.
(Use Genuine RTV silicone sealant Part No. 999MP-A7007
or equivalent.)
IFor oil pan, be sure liquid gasket diameter is 4.0 to 5.0 mm
(0.157 to 0.197 in).
IFor areas except oil pan, be sure liquid gasket diameter is 2.0
to 3.0 mm (0.079 to 0.118 in).
3. Apply liquid gasket around the inner side of bolt holes (unless
otherwise specified).
4. Assembly should be done within 5 minutes after coating.
5. Wait at least 30 minutes before refilling engine oil and engine
coolant.
Preparation
SPECIAL SERVICE TOOLSNBLC0014The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
WS39930000
(Ð)
Tube pressure
NT052
Pressing the tube of liquid gasket
EG17650301
(J33984-A)
Radiator cap tester
adapter
NT564
Adapting radiator cap tester to radiator filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
KV99103510
(Ð)
Radiator plate pliers A
NT224
Installing radiator upper and lower tanks
KV99103520
(Ð)
Radiator plate pliers B
NT225
Removing radiator upper and lower tanks
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ENGINE COOLING SYSTEM
Precautions
LC-9

SLC756A
CHECKING COOLING SYSTEM FOR LEAKSNBLC0016S04To check for leakage, apply pressure to the cooling system with a
tester.
Testing pressure:
157 kPa (1.6 kg/cm
2, 23 psi)
CAUTION:
Higher than the specified pressure may cause radiator
damage.
Water Pump
REMOVAL AND INSTALLATIONNBLC0017CAUTION:
IWhen removing water pump assembly, be careful not to
get coolant on drive belt.
IWater pump cannot be disassembled and should be
replaced as a unit.
IAfter installing water pump, connect hose and clamp
securely, then check for leaks using radiator cap tester.
SLC326B
SLC327B
REMOVALNBLC00181. Remove under cover.
2. Remove suspension member stay.
3. Drain coolant from radiator.
4. Remove radiator shrouds.
5. Remove drive belts.
6. Remove cooling fan.
7. Remove water drain plug on water pump side of cylinder block.
8. Remove chain tensioner cover and water pump cover.
ENGINE COOLING SYSTEM
System Check (Cont'd)
LC-12