2006 INFINITI M35 engine cooling

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QUICK REFERENCE INDEX
AGENERAL INFORMATIONGIGeneral Information
BENGINEEMEngine Mechanical
LUEngine Lubrication System
COEngine Cooling System
ECEngine Control System
FLFuel System
EXExhaust System
ACCAccelerator Control System
CTRANSMISSION/
TRANSAXLEATAutomatic Transmission
DDRIVELINE/AXLETFTransfer
PRPropeller Shaft
FFDFront Final Drive
RFDRear Final Drive
FAXFront Axle
RAXRear Axle
ESUSPENSIONFSUFront Suspension
RSURear Suspension
WTRoad Wheels & Tires
FBRAKESBRBrake System
PBParking Brake System
BRCBrake Control System
GSTEERINGPSPower Steering System
STCSteering Control System
HRESTRAINTSSBSeat Belts
SRSSupplemental Restraint System
(SRS)
IBODYBLBody, Lock & Security System
GWGlasses, Window System & Mir-
rors
RFRoof
EIExterior & Interior
IPInstrument Panel
SESeat
JAIR CONDITIONERATCAutomatic Air Conditioner
KELECTRICALSCStarting & Charging System
LTLighting System
DIDriver Information System
WWWiper, Washer & Horn
BCSBody Control System
LANLAN System
AVAudio-Visual System
ACSAuto Cruise Control System
PGPower Supply, Ground & Circuit Ele-
ments
LMAINTENANCEMAMaintenance
MINDEXIDXAlphabetical Index
Edition: January 2005
Revision: January 2006

QUICK REFERENCE CHART M35/M45
QUICK REFERENCE CHART M35/M45PFP: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 pump belt7 (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)
A/C compresor belt 12 (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) —
Radiator 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
2006

QUICK REFERENCE CHART M35/M45
ENGINE TUNE-UP DATA (VK45DE)
FRONT WHEEL ALIGNMENT (Unladen* )
ELS0003X
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
Radiator cap relief pressure
kPa (kg/cm
2 , psi)
7 8 - 98 (0.8 - 1.0 , 11 - 14) Standard
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
1,320 (13.5, 191) /300 Standard
Minimum 1,130 (11.5, 164) /300
Spark plug Standard type PLFR5A-11
Hot type PLFR4A-11
Cold type PLFR6A-11
Axle2WD AWD
Tire P245/45R18 245/40R19 245/45R18
Camber
Degree minute (Decimal degree)Minimum – 1
00 (– 1.00)
Nominal – 0
15 (– 0.25)
Maximum 0
30 (0.50)
Left and right difference 33
(0.55) or less
Caster
Degree minute (Decimal degree)Minimum 3
45 ( 3.75 ) 3 50 (3.83)3 05 ( 3.08 )
Nominal 4
30 ( 4.50 ) 4 35 (4.58)3 50 ( 3.83 )
Maximum 5
15 ( 5.25 ) 5 20 (5.33)4 35 ( 4.58 )
Left and right difference 39
(0.65) or less
Kingpin inclination
Degree minute (Decimal degree)Minimum 6
30 (6.50)
Nominal 7
15 (7.25)
Maximum 8
00 (8.00)
Total toe-inDistance (A – B)Minimum 0 mm (0 in)
Nominal 1 mm (0.04 in)
Maximum 2 mm (0.08 in)
Angle (left plus right)
Degree minute
(Degree)Minimum 0
(0)
Nominal 3
(0.05)
Maximum 6
(0.10)
2006

PRECAUTIONS
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Revision: 2006 January2006 M35/M45
Clean or replace ATF cooler if excessive foreign material is found in oil pan or clogging strainer. Refer to
AT- 9 , "
ATF COOLER SERVICE" .
After overhaul, refill the transmission with new ATF.
When the A/T drain plug is removed, only some of the ATF is drained. Old ATF will remain in torque con-
verter and ATF cooling system.
Always follow the procedures under “Changing A/T Fluid” in the AT section when changing A/T fluid. Refer
to AT- 1 2 , "
Changing A/T Fluid" , AT- 1 3 , "Checking A/T Fluid" .
Service Notice or PrecautionsNCS001JF
ATF COOLER SERVICE
If ATF contains frictional material (clutches, bands, etc.), or if an A/T is repaired, overhauled, or replaced,
inspect and clean the A/T fluid cooler mounted in the radiator or replace the radiator. Flush cooler lines using
cleaning solvent and compressed air after repair. For A/T fluid cooler cleaning procedure, refer to AT- 1 4 , "
A/T
Fluid Cooler Cleaning" . For radiator replacement, refer to CO-14, "RADIATOR" (for VQ35DE engine), CO-43,
"RADIATOR" (for VK45DE engine).
OBD-II SELF-DIAGNOSIS
A/T self-diagnosis is performed by the TCM in combination with the ECM. The results can be read through
the blinking pattern of the A/T CHECK indicator or the malfunction indicator lamp (MIL). Refer to the table
on AT- 9 2 , "
SELF-DIAGNOSTIC RESULT MODE" for the indicator used to display each self-diagnostic
result.
The self-diagnostic results indicated by the MIL are automatically stored in both the ECM and TCM mem-
ories.
Always perform the procedure on AT- 4 1 , "
HOW TO ERASE DTC" to complete the repair and avoid
unnecessary blinking of the MIL.
For details of OBD-II, refer to EC-54, "
ON BOARD DIAGNOSTIC (OBD) SYSTEM" (for VQ35DE engine), EC-
764, "ON BOARD DIAGNOSTIC (OBD) SYSTEM" (for VK45DE engine).
Certain systems and components, especially those related to OBD, may use the new style slide-
locking type harness connector. For description and how to disconnect, refer to PG-102, "
HAR-
NESS CONNECTOR" .

AT-14
A/T FLUID
Revision: 2006 January2006 M35/M45
CAUTION:
When wiping away the A/T fluid level gauge, always use lint-free paper, not a cloth one.
To check A/T fluid level, insert the A/T fluid level gauge
until the cap contacts the end of the A/T fluid charging
pipe, with the A/T fluid level gauge reversed from the nor-
mal attachment conditions as shown.
8. Check A/T fluid condition.
If ATF is very dark or smells burned, check operation of A/T.
Flush cooling system after repair of A/T.
If A/T fluid contains frictional material (clutches, bands, etc.),
replace radiator and flush cooler line using cleaning solvent
and compressed air after repair of A/T. Refer to CO-14,
"RADIATOR" (for VQ35DE engine), CO-43, "RADIATOR"
(for VK45DE engine) and AT- 1 4 , "A/T Fluid Cooler Cleaning" .
9. Install the removed A/T fluid level gauge in the A/T fluid charging
pipe.
10. Tighten level gauge bolt.
A/T Fluid Cooler CleaningNCS001JK
Whenever an A/T is replaced, the A/T fluid cooler mounted in the radiator must be inspected and cleaned.
Metal debris and friction material, if present, can become trapped in the A/T fluid cooler. This debris can con-
taminate the newly serviced A/T or, in severe cases, can block or restrict the flow of ATF. In either case, mal-
function of the newly serviced A/T may result.
Debris, if present, may build up as ATF enters the cooler inlet. It will be necessary to back flush the cooler
through the cooler outlet in order to flush out any built up debris.
A/T FLUID COOLER CLEANING PROCEDURE
1. Position an oil pan under the A/T inlet and outlet cooler hoses.
2. Identify the inlet and outlet fluid cooler hoses.
3. Disconnect the A/T fluid cooler inlet and outlet rubber hoses
from the steel cooler tubes or bypass valve.
NOTE:
Replace the cooler hoses if rubber material from the hose
remains on the tube fitting.
4. Allow any ATF that remains in the cooler hoses to drain into the
oil pan.Level gauge bolt
: 5.1 Nꞏm (0.52 kg-m, 45 in-lb)
SCIA2899E
SCIA4896E
SCIA3830E

ATC-2Revision: 2006 January2006 M35/M45 AUTO SWITCH ................................................... 34
DEFROSTER (DEF) SWITCH ............................. 34
UPPER VENT SWITCH ...................................... 34
A/C SWITCH ....................................................... 35
FAN SWITCHES .................................................. 35
OFF SWITCH ...................................................... 35
REAR WINDOW DEFOGGER SWITCH ............. 35
INTAKE SWITCH ................................................. 35
DUAL SWITCH .................................................... 35
Control Operation (Rear Control Switch) ................ 35
AUTO SWITCH ................................................... 35
FAN SWITCH ...................................................... 35
REAR TEMPERATURE CONTROL SWITCH ..... 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 Function (ECM) .................................. 40
CONSULT-II BASIC OPERATION ....................... 40
DATA MONITOR .................................................. 40
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 40
WORK FLOW ...................................................... 40
SYMPTOM TABLE .............................................. 41
Component Parts and Harness Connector Location ... 42
ENGINE COMPARTMENT .................................. 42
PASSENGER COMPARTMENT .......................... 43
Schematic ............................................................... 44
Wiring Diagram —A/C— ......................................... 46
Auto Amp. Terminals and Reference Value ............ 53
PIN CONNECTOR TERMINAL LAYOUT ............ 53
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ........................ 53
Self-diagnosis Function .......................................... 55
DESCRIPTION .................................................... 55
FUNCTION CONFIRMATION PROCEDURE ...... 56
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 62
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 63
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION ................................................. 63
Operational Check .................................................. 64
CHECKING MEMORY FUNCTION ..................... 64
CHECKING BLOWER ......................................... 64
CHECKING DISCHARGE AIR (MODE SWITCH
AND DEF SWITCH) ............................................ 64
CHECKING DISCHARGE AIR (UPPER VENT
SWITCH) ............................................................. 65
CHECKING INTAKE AIR ..................................... 65
CHECKING TEMPERATURE DECREASE ......... 65
CHECKING TEMPERATURE INCREASE .......... 65
CHECKING A/C SWITCH ................................... 65
CHECKING AUTO MODE ................................... 65
Power Supply and Ground Circuit for Auto Amp. ... 66
INSPECTION FLOW ........................................... 66
COMPONENT DESCRIPTION ............................ 67DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 67
Rear Control Switch Circuit ..................................... 69
DIAGNOSIS PROCEDURE FOR REAR CON-
TROL SWITCH .................................................... 69
LAN System Circuit ................................................. 70
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 70
Mode Door Motor Circuit ......................................... 75
INSPECTION FLOW ............................................ 76
SYSTEM DESCRIPTION ..................................... 78
COMPONENT DESCRIPTION ............................ 79
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ................................................................ 79
Upper Ventilator Door Motor Circuit ........................ 80
INSPECTION FLOW ............................................ 80
SYSTEM DESCRIPTION ..................................... 81
COMPONENT DESCRIPTION ............................ 82
DIAGNOSIS PROCEDURE FOR UPPER VEN-
TILATOR DOOR MOTOR .................................... 82
Air Mix Door Motor Circuit ....................................... 83
INSPECTION FLOW ............................................ 83
SYSTEM DESCRIPTION ..................................... 84
COMPONENT DESCRIPTION ............................ 85
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR ................................................................ 85
Air Mix Door Motor PBR Circuit .............................. 85
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR ....................................................... 85
Intake Door Motor Circuit ........................................ 86
INSPECTION FLOW ............................................ 86
SYSTEM DESCRIPTION ..................................... 87
COMPONENT DESCRIPTION ............................ 88
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ................................................................ 88
Blower Motor Circuit ................................................ 89
INSPECTION FLOW ............................................ 89
SYSTEM DESCRIPTION ..................................... 90
COMPONENT DESCRIPTION ............................ 91
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ................................................................ 91
COMPONENT INSPECTION ............................... 93
Magnet Clutch Circuit .............................................. 94
INSPECTION FLOW ............................................ 94
SYSTEM DESCRIPTION ..................................... 95
DIAGNOSIS PROCEDURE FOR MAGNET
CLUTCH .............................................................. 95
COMPONENT INSPECTION ............................... 98
Insufficient Cooling .................................................. 99
INSPECTION FLOW ............................................ 99
PERFORMANCE TEST DIAGNOSIS ................101
PERFORMANCE CHART ..................................103
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE .................................................................105
DIAGNOSIS PROCEDURE FOR INSUFFI-
CIENT COOLING ...............................................107
Insufficient Heating ...............................................109
INSPECTION FLOW ..........................................109
Noise .....................................................................110
INSPECTION FLOW ..........................................110
Self-Diagnosis ....................................................... 111

ATC-3
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AT C
Revision: 2006 January2006 M35/M45 INSPECTION FLOW ......................................... . 111
Memory Function .................................................. 112
INSPECTION FLOW .......................................... 112
Ambient Sensor Circuit ......................................... 113
COMPONENT DESCRIPTION .......................... 113
AMBIENT TEMPERATURE INPUT PROCESS .. 113
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR ............................................................ 113
COMPONENT INSPECTION ............................. 115
In-Vehicle Sensor Circuit ....................................... 116
COMPONENT DESCRIPTION .......................... 116
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR ............................................................ 117
COMPONENT INSPECTION ............................. 118
Sunload Sensor Circuit ......................................... 119
COMPONENT DESCRIPTION .......................... 119
SUNLOAD INPUT PROCESS ........................... 119
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR ............................................................ 119
COMPONENT INSPECTION ............................121
Intake Sensor Circuit ............................................122
COMPONENT DESCRIPTION .........................122
DIAGNOSIS PROCEDURE FOR INTAKE SEN-
SOR ..................................................................122
COMPONENT INSPECTION ............................123
CONTROLLER .......................................................124
Removal and Installation of Multifunction Switch . 124
REMOVAL ........................................................
.124
INSTALLATION .................................................124
AUTO AMP .............................................................125
Removal and Installation of Unified Meter and A/C
Auto Amp. ............................................................125
REMOVAL ........................................................
.125
INSTALLATION .................................................125
AMBIENT SENSOR ................................................126
Removal and Installation ......................................126
REMOVAL ........................................................
.126
INSTALLATION .................................................126
IN-VEHICLE SENSOR ............................................127
Removal and Installation ......................................127
REMOVAL ........................................................
.127
INSTALLATION .................................................127
SUNLOAD SENSOR ..............................................128
Removal and Installation ......................................128
REMOVAL ........................................................
.128
INSTALLATION .................................................128
INTAKE SENSOR .................................................. .129
Removal and Installation ......................................129
REMOVAL ........................................................
.129
INSTALLATION .................................................129
BLOWER UNIT .......................................................130
Removal and Installation ......................................130
REMOVAL ........................................................
.130
INSTALLATION .................................................130
Disassembly and Assembly .................................131
BLOWER MOTOR ..................................................132
Removal and Installation ......................................132
REMOVAL ........................................................
.132
INSTALLATION .................................................132INTAKE DOOR MOTOR .........................................133
Removal and Installation ......................................133
REMOVAL ........................................................
.133
INSTALLATION .................................................133
IN-CABIN MICROFILTER .......................................134
Removal and Installation ......................................134
FUNCTION .......................................................
.134
REPLACEMENT TIMING ..................................134
REPLACEMENT PROCEDURES .....................134
HEATER & COOLING UNIT ASSEMBLY ...............135
Removal and Installation ......................................135
REMOVAL ........................................................
.135
INSTALLATION .................................................136
Disassembly and Assembly ..................................138
MODE DOOR MOTOR ............................................140
Removal and Installation ......................................140
REMOVAL ........................................................
.140
INSTALLATION .................................................140
AIR MIX DOOR MOTOR .........................................141
Removal and Installation ......................................141
REMOVAL ........................................................
.141
INSTALLATION .................................................141
UPPER VENTILATOR DOOR MOTOR ..................142
Removal and Installation ......................................142
REMOVAL ........................................................
.142
INSTALLATION .................................................142
HEATER CORE .......................................................143
Removal and Installation ......................................143
REMOVAL ........................................................
.143
INSTALLATION .................................................143
DUCTS AND GRILLES ...........................................144
Removal and Installation ......................................144
COMPONENT LAYOUT ....................................144
REMOVAL ........................................................
.146
INSTALLATION .................................................150
REFRIGERANT LINES ...........................................151
HFC-134a (R-134a) Service Procedure ...............151
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................151
Components ....................................................
.....153
VQ35DE ............................................................153
VK45DE .............................................................154
Removal and Installation of Compressor ..............155
REMOVAL ........................................................
.155
INSTALLATION .................................................157
Check Disc to Pulley Clearance ...........................157
Removal and Installation of Low-Pressure Flexible
Hose and Pipe ......................................................158
REMOVAL ........................................................
.158
INSTALLATION .................................................158
Removal and Installation of High-Pressure Flexible
Hose .....................................................................159
REMOVAL ........................................................
.159
INSTALLATION .................................................160
Removal and Installation of High-Pressure Pipe 1
(Engine Compartment) .........................................160
REMOVAL ........................................................
.160
INSTALLATION .................................................161
Removal and Installation of Low-Pressure Pipe 1

ATC-26
LUBRICANT
Revision: 2006 January2006 M35/M45
LUBRICANTPFP:KLG00
Maintenance of Lubricant Quantity in CompressorNJS000G3
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, never perform the lubricant return operation.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS
1. Start the engine, and set to the following conditions:
–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 30C (77 to 86F).]
–Intake position: Recirculation (REC)
2. Perform lubricant return operation for about 10 minutes.
3. Stop the engine.
>> GO TO 3.
3. CHECK REPLACEMENT PART
Should the compressor be replaced?
YES >> GO TO AT C - 2 7 , "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACE-
MENT" .
NO >> GO TO AT C - 2 7 , "
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACE-
MENT EXCEPT COMPRESSOR" . Name : Nissan A/C System Oil Type S