2004 INFINITI FX35 engine cooling system

ABCDEFGHIJKMLQUICK REFERENCE INDEX AGENERAL INFORMATIONGIGeneral InformationBENGINEEMEngine MechanicalLUEngine Lubrication SystemCOEngine Cooling SystemECEngine Control SystemFLFuel SystemEXExhaust SystemACCAccelerator Control SystemCTRANSMISSION/
TRANSAXLEATAutomatic TransmissionDDRIVELINE/AXLETFTransferPRPropeller ShaftFFDFront Final DriveRFDRear Final DriveFAXFront AxleRAXRear AxleESUSPENSIONFSUFront SuspensionRSURear SuspensionWTRoad Wheels & TiresFBRAKESBRBrake SystemPBParking Brake SystemBRCBrake Control SystemGSTEERINGPSPower Steering SystemHRESTRAINTSSBSeat BeltsSRSSupplemental Restraint System
(SRS)IBODYBLBody, Lock & Security SystemGWGlasses, Window System & Mir-
rorsRFRoofEIExterior & InteriorIPInstrument PanelSESeatJAIR CONDITIONERATCAutomatic Air ConditionerKELECTRICALSCStarting & Charging SystemLTLighting SystemDIDriver Information SystemWWWiper, Washer & HornBCSBody Control SystemLANLAN SystemAVAudio Visual, Navigation & Tele-
phone SystemACSAuto Cruise Control SystemPGPower Supply, Ground & Circuit Ele-
mentsLMAINTENANCEMAMaintenanceMINDEXIDXAlphabetical IndexEdition: July 2003
Revision: November 2004

QUICK REFERENCE CHART FX35/FX45
QUICK REFERENCE CHART FX35/FX45PFP:00000
ENGINE TUNE-UP DATA (VQ35DE)ELS0003W
Engine modelVQ35DE
Firing order1-2-3-4-5-6
Idle speed
A/T (In “P” or “N” position)rpm
650±50
Ignition timing (BTDC at idle speed)
A/T (In “P” or “N” position)15°± 5°
CO% at idle 0.7 - 9.9 % and engine runs smoothly
Drive BeltDeflection adjustment Unit: mm (in) Tension adjustment Unit: N (kg, lb)
Used belt
New beltUsed belt
New belt
Limit After adjustment Limit After adjustment
Alternator and power
steering oil pump7 (0.28)4 - 5
(0.16 - 0.20)3.5 - 4.5
(0.138 - 0.177)294 (30, 66)730 - 818
(74.5 - 83.5,
164 - 184)838 - 926
(85.5 - 94.5,
188 - 208)
Air conditioner com-
pressor belt12 (0.47)9 - 10
(0.35 - 0.39)8 - 9
(0.31 - 0.35)196 (20, 44)348 - 436
(35.5 - 44.5,
78 - 98)470 - 559
( 4 8 - 5 7 ,
106 - 126)
Applied pushing force 98N (10kg, 22lb) —
Radiater cap relief pressure
kPa (kg/cm
2 , psi)
Standard 78 - 98 (0.8 - 1.0, 11 - 14)
Limit 59 (0.6, 9)
Cooling system leakage testing pres-
surekPa (kg/cm
2 , psi)157(1.6, 23)
Compression pressure
kPa (kg/cm
2 , psi)/rpm
Standard 1,275 (13.0, 185) /300
Minimum 981 (10.0, 142)/300
Spark plug Standard type PLFR5A - 11
Hot type PLFR4A - 11
Cold type PLFR6A - 11
2004

QUICK REFERENCE CHART FX35/FX45
ENGINE TUNE-UP DATA (VK45DE)
FRONT WHEEL ALIGNMENT (Unladen* )
ELS0003X
* : Fuel, engine coolant and engine oil full. Spare tire, jack, hand tools and mats in designated positions.Engine modelVK45DE
Firing order1-8-7-3-6-5-4-2
Idle speed
A/T (In “P” or “N” position) rpm650±50
Ignition timing
(BTDC at idle speed)12°±5°
CO% at idle 0.7 - 9.9 % and engine runs smoothly
Tensions of drive belts Auto adjustment by auto tensioner
Radiater cap relief pressure
kPa (kg/cm
2 , psi)
Standard 78 - 98 (0.8 - 1.0 , 11 - 14 )
Limit 59 (0.6, 9)
Cooling system leakage testing pressure
157(1.6, 23)
kPa (kg/cm
2 , psi)
Compression pressure
kPa (kg/cm
2 , psi)/rpm
Standard 1,320 (13.5, 191) /300
Minimum 1,130 (11.5, 164)/300
Spark plug Standard type PLFR5A - 11
Hot type PLFR4A - 11
Cold type PLFR6A - 11
Camber Degree minute (Decimal degree) Minimum – 1° 29′ ( – 1.48° )
Nominal – 0° 44′ ( – 0.73° )
Maximum 0° 01′ ( 0.02° )
Left and right difference 45′ ( 0.75° ) or less
Caster Degree minute (Decimal degree) Minimum 3° 02′ ( 3.03° )
Nominal 3° 47′ ( 3.78° )
Maximum 4° 32′ ( 4.53° )
Left and right difference 45′ ( 0.75° ) or less
Kingpin inclination Degree minute (Decimal degree) Minimum 12° 20′ ( 12.33° )
Nominal 13° 05′ ( 13.08° )
Maximum 13 50′ ( 13.83° )
Total toe-in Distance (A – B) Minimum 0.6 mm ( 0.024 in )
Nominal 1.6 mm ( 0.063 in )
Maximum 2.6 mm ( 0.102 in )
Angle (left plus right)
Degree minute (Degree)Minimum –
Nominal 6′ ( 0.1° )
Maximum –
Wheel turning angle (Full turn) Inside MInimum 32° 00′ ( 32.0° )
Degree minute (Decimal degree) Nominal 35° 00′ ( 35.0° )
Maximum 36° 00′ ( 36.0° )
Outside
Nominal 30° 00′ ( 30.0° )
Degree minute (Decimal degree)
2004

ATC-2Revision: 2004 November 2004 FX35/FX45DUAL SWITCH (WITH LEFT AND RIGHT VEN-
TILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM) .......................................... 35
Fail-safe Function ................................................... 36
Discharge Air Flow ................................................. 37
System Description ................................................. 38
SWITCHES AND THEIR CONTROL FUNCTION ... 38
CAN Communication System Description .............. 39
TROUBLE DIAGNOSIS ............................................ 40
CONSULT-II ............................................................ 40
CONSULT-II BASIC OPERATION ....................... 40
DATA MONITOR .................................................. 41
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 42
WORK FLOW ...................................................... 42
SYMPTOM TABLE .............................................. 42
Component Parts and Harness Connector Location ... 43
ENGINE COMPARTMENT .................................. 43
PASSENGER COMPARTMENT .......................... 44
Schematic ............................................................... 45
Wiring Diagram —A/C— ......................................... 46
Auto Amp. Terminals and Reference Value ............ 51
PIN CONNECTOR TERMINAL LAYOUT ............ 51
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ........................ 51
Self-diagnosis Function .......................................... 53
DESCRIPTION .................................................... 53
FUNCTION CONFIRMATION PROCEDURE ...... 54
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 59
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 60
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION ................................................. 60
Operational Check .................................................. 61
CHECKING MEMORY FUNCTION ..................... 61
CHECKING BLOWER ......................................... 61
CHECKING DISCHARGE AIR ............................ 61
CHECKING RECIRCULATION ............................ 62
CHECKING TEMPERATURE DECREASE ......... 62
CHECKING TEMPERATURE INCREASE .......... 62
CHECK A/C SWITCH .......................................... 62
CHECKING AUTO MODE ................................... 63
Power Supply and Ground Circuit for Auto Amp. ... 63
INSPECTION FLOW ........................................... 63
COMPONENT DESCRIPTION ............................ 64
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ... 64
LAN System Circuit ................................................ 66
DIAGNOSTIC PROCEDURE FOR LAN CIR-
CUIT .................................................................... 66
Mode Door Motor Circuit ........................................ 70
INSPECTION FLOW ........................................... 70
SYSTEM DESCRIPTION .................................... 71
COMPONENT DESCRIPTION ............................ 72
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ................................................... 72
Air Mix Door Motor Circuit ...................................... 73
INSPECTION FLOW ........................................... 73SYSTEM DESCRIPTION ..................................... 74
COMPONENT DESCRIPTION ............................ 75
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR .................................................................. 75
Air Mix Door Motor PBR Circuit .............................. 75
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR PBR .......................................................... 75
Intake Door Motor Circuit ........................................ 76
INSPECTION FLOW ............................................ 76
SYSTEM DESCRIPTION ..................................... 77
COMPONENT DESCRIPTION ............................ 78
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR .................................................... 78
Blower Motor Circuit ................................................ 79
INSPECTION FLOW ............................................ 79
SYSTEM DESCRIPTION ..................................... 80
COMPONENT DESCRIPTION ............................ 81
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ................................................................ 81
COMPONENT INSPECTION ............................... 83
Magnet Clutch Circuit .............................................. 84
INSPECTION FLOW ............................................ 84
SYSTEM DESCRIPTION ..................................... 85
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH .............................................................. 85
COMPONENT INSPECTION ............................... 90
Insufficient Cooling .................................................. 91
INSPECTION FLOW ............................................ 91
PERFORMANCE TEST DIAGNOSIS .................. 93
PERFORMANCE CHART .................................... 95
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE ................................................................... 96
DIAGNOSTIC PROCEDURE FOR INSUFFI-
CIENT COOLING ................................................. 98
Insufficient Heating ...............................................100
INSPECTION FLOW ..........................................100
Noise .....................................................................101
INSPECTION FLOW ..........................................101
Self-diagnosis .......................................................102
INSPECTION FLOW ..........................................102
Memory Function ..................................................103
INSPECTION FLOW ..........................................103
Ambient Sensor Circuit .........................................104
COMPONENT DESCRIPTION ..........................104
AMBIENT TEMPERATURE INPUT PROCESS .104
DIAGNOSTIC PROCEDURE FOR AMBIENT
SENSOR ............................................................104
COMPONENT INSPECTION .............................106
In-vehicle Sensor Circuit .......................................107
COMPONENT DESCRIPTION ..........................107
DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
SENSOR ............................................................108
COMPONENT INSPECTION .............................109
Sunload Sensor Circuit .........................................110
COMPONENT DESCRIPTION ..........................110
SUNLOAD INPUT PROCESS ...........................110
DIAGNOSTIC PROCEDURE FOR SUNLOAD
SENSOR ............................................................110

LUBRICANT
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Revision: 2004 November 2004 FX35/FX45
LUBRICANTPFP:KLG00
Maintenance of Lubricant Quantity in CompressorAJS00149
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large refrigerant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:

Lack of lubricant: May lead to a seized compressor

Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
1. CHECK LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?

A/C system works properly.

There is no evidence of a large amount of lubricant leakage.
CAUTION:
If excessive lubricant leakage is noted, do not perform the lubricant return operation.
YES or NO
YES >> GO TO 2.
NO >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS:
1. Start engine, and set the following conditions:
–Test condition
Engine speed: Idling to 1,200 rpm
A/C switch: ON
Blower speed: Max. position
Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).]
Intake position: Recirculation (REC)
2. Perform lubricant return operation for about 10 minutes.
3. Stop engine.
>> GO TO 3.
3. CHECK REPLACEMENT PART
Should the compressor be replaced?
YES >> GO TO AT C - 2 9 , "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACE-
MENT" .
NO >> GO TO AT C - 2 8 , "
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACE-
MENT EXCEPT COMPRESSOR" . Name : NISSAN A/C System Oil Type S
Part number : KLH00-PAGS0

ATC-96
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
Whenever system′s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too high.Pressure is reduced soon
after water is splashed on
condenser.Excessive refrigerant charge
in refrigeration cycleReduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance
↓
1. Condenser fins are clogged.
2. Improper fan rotation of
cooling fan

Clean condenser.

Check and repair cooling fan
as necessary.

Low-pressure pipe is not
cold.

When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2
kg/cm
2 , 28 psi). It then
decreases gradually there-
after.Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure
decreases too slowly.)
↓
Air in refrigeration cycleEvacuate repeatedly and
recharge system.
Engine tends to overheat.Engine cooling systems mal-
function.Check and repair each engine
cooling system.

An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.

Plates are sometimes cov-
ered with frost.

Excessive liquid refrigerant
on low-pressure side

Excessive refrigerant dis-
charge flow

Expansion valve is open a
little compared with the
specification.
↓
Improper expansion valve
adjustmentReplace expansion valve.
AC359A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high and
low-pressure side is too low.
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.

Check and repair or replace
malfunctioning parts.

Check lubricant for contami-
nation.
AC360A

ATC-126
HEATER & COOLING UNIT ASSEMBLY
Revision: 2004 November 2004 FX35/FX45
HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationAJS0015J
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge refrigerant.
2. Drain coolant from cooling system. Refer to CO-11, "
Changing Engine Coolant" (VQ35DE) or CO-36,
"Changing Engine Coolant" (VK45DE).
3. Remove cowl top cover. Refer to EI-24, "
COWL TOP" .
4. Remove high-pressure pipe 2 mounting clip.
5. Remove low-pressure flexible hose bracket mounting bolts.
6. Disconnect evaporator-side one touch joint.
a. Set a disconnector (High-pressure side: 92530-89908, Low-
pressure side: 92530-89916) on A/C piping.
b. Slide a disconnector toward vehicle front until it clicks.
c. Slide A/C piping toward vehicle front and disconnect it.
CAUTION:
Seal connection opening of piping with a cap or vinyl tape
to avoid exposure to atmosphere.
7. Remove electronic control throttle assembly (VQ35DE). Refer to
EM-19, "
INTAKE MANIFOLD COLLECTOR" .
8. Disconnect two heater hoses from heater core.
9. Remove instrument panel assembly. Refer to IP-11, "
Removal
and Installation" .
10. Remove blower unit. Refer to ATC-121, "
BLOWER UNIT" .
11. Remove instrument stays (driver side and passenger side).
RJIA2037E
RJIA2041E
RJIA2077E
RJIA2042E

REFRIGERANT LINES
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Revision: 2004 November 2004 FX35/FX45
CHECKING PROCEDURE
To 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 dispersed.
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 16°C (61°F). If less
than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.
NOTE:
At temperatures below 16°C (61°F), leaks may not be detected since the system may not reach 345 kPa
(3.52 kg/cm
2 , 50 psi).
4. Perform the leak test from the high-pressure side (compressor discharge a to evaporator inlet h) to the
low-pressure side [evaporator drain hose i to shaft seal o (VK45DE) or n (VQ35DE)]. Refer to ATC-139,
"Components" . Perform a leak check for the following areas carefully. Clean the component to be
checked and move the leak detected probe completely around the connection/component.
Compressor
Check the fitting of high- and low-pressure hoses, relief valve and shaft seal.
Liquid tank
Check the refrigerant connection.
Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to pre-
vent 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.
Cooling unit (Evaporator)
With engine OFF, turn blower fan on “High” 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 10 seconds. Use caution not to contaminate the probe tip with water
or dirt that may be in the drain hose.
5. If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected
leak, then repeat check as outlined above.
6. Do not stop when one leak is found. Continue to check for additional leaks at all system components.
If no leaks are found, perform steps 7-10.
7. Start engine.
8. Set the heater A/C control as follows;
a. A/C switch: ON
b. Face mode
c. Intake position: Recirculation
d. Max cold temperature
e. Fan speed: High
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Turn engine off and perform leak check again following steps 4 through 6 above.