2005 INFINITI FX35 Cooling fan

ATC-2Revision: 2005 July 2005 FX
MODE SWITCH ................................................
... 35
FAN SWITCH ................................................... ... 35
DUAL 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 Function (BCM) ............................... ... 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 INTAKE AIR .................................. ... 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
DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 64
LAN System Circuit ............................................. ... 66
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 66
Mode Door Motor Circuit ..................................... ... 70
INSPECTION FLOW ........................................ ... 70
SYSTEM DESCRIPTION ................................. ... 71
COMPONENT DESCRIPTION ......................... ... 72
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ............................................................ ... 72
Air Mix Door Motor Circuit ................................... ... 73
INSPECTION FLOW ........................................ ... 73 SYSTEM DESCRIPTION ..................................
... 74
COMPONENT DESCRIPTION ......................... ... 75
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR ............................................................. ... 75
Air Mix Door Motor PBR Circuit ........................... ... 75
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR .................................................... ... 75
Intake Door Motor Circuit ..................................... ... 76
INSPECTION FLOW ......................................... ... 76
SYSTEM DESCRIPTION .................................. ... 77
COMPONENT DESCRIPTION ......................... ... 78
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ............................................................. ... 78
Blower Motor Circuit ............................................. ... 79
INSPECTION FLOW ......................................... ... 79
SYSTEM DESCRIPTION .................................. ... 80
COMPONENT DESCRIPTION ......................... ... 81
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ............................................................. ... 81
COMPONENT INSPECTION ............................ ... 83
Magnet Clutch Circuit ........................................... ... 84
INSPECTION FLOW ......................................... ... 84
SYSTEM DESCRIPTION .................................. ... 85
DIAGNOSIS 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
DIAGNOSIS 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
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR ........................................................... .104
COMPONENT INSPECTION ............................ .106
In-vehicle Sensor Circuit ...................................... .107
COMPONENT DESCRIPTION ......................... .107
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR ........................................................... .108
COMPONENT INSPECTION ............................ .109
Sunload Sensor Circuit ........................................ .110
COMPONENT DESCRIPTION ......................... .110
SUNLOAD INPUT PROCESS .......................... .110
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR ........................................................... .110

ATC-96
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
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 cycle. Reduce 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 cycle. Evacuate 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
adjustment. Replace 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-142
REFRIGERANT LINES
Revision: 2005 July 2005 FX
VK45DE
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove air cleaner case and air duct. Refer to EM-17, "
AIR CLEANER AND AIR DUCT" (VQ35DE) or
EM-176, "
AIR CLEANER AND AIR DUCT" (VK45DE).
3. Remove front engine undercover, using power tools.
4. Remove cooling fan shroud (lower). Refer to CO-41, "
RADIATOR" (VK45DE).
5. Remove mounting nuts from low-pressure flexible hose and high-pressure flexible hose.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.
6. Remove high-pressure flexible hose. Refer to ATC-149,
"Removal and Installation of High-Pressure Flexible Hose"
(VK45DE).
7. Disconnect compressor connector.
8. Remove A/C compressor belt. Refer to EM-15, "
DRIVE BELTS" (VQ35DE) or EM-173, "DRIVE BELTS"
(VK45DE).
RJIA2244E
RJIA2059E
RJIA2058E

REFRIGERANT LINES ATC-155
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Revision: 2005 July 2005 FX
Removal and Installation of CondenserAJS0015Z
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Remove the air cleaner case and air duct. Refer to EM-17, "
AIR CLEANER AND AIR DUCT" (VQ35DE)
or EM-176, "
AIR CLEANER AND AIR DUCT" (VK45DE).
3. Remove engine undercover, using power tools.
4. Drain engine coolant (VK45DE). Refer to CO-37, "
Changing Engine Coolant" .
5. Remove cooling fan shroud after removing radiator upper hose (VK45DE). Refer to CO-41, "
RADIATOR" .
6. Remove mounting bolt for high-pressure flexible hose bracket.
7. Disconnect high-pressure flexible hose and high-pressure pipe 1 from condenser.
a. Set a disconnector [condenser outlet (SST: 9253089908), con- denser inlet (SST: 9253089912)]on A/C piping.
b. Slide a disconnector upward until it clicks.
c. Slide A/C piping upward and disconnect it.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.
8. Remove mounting bolts for condenser.
9. Remove radiator upper mount, move radiator and condenser to the engine side.
10. Remove condenser. CAUTION:
Be careful not to damage the core surface of the condenser and the radiator.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings of A/C piping with new ones, and then apply compressor oil to it when installing
it.

Connection point for female-side piping is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert in axial direction.

Insert one-touch joint connection point securely until it clicks.
RJIA2065E
RJIA2066E
RJIA2075E

ATC-160
REFRIGERANT LINES
Revision: 2005 July 2005 FX
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. Stop engine.
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-140,
"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 flexible hoses, relief valve and shaft seal.
Condenser
Check the fitting of high-pressure flexible hose and pipe, refrigerant pressure sensor.
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. Mode door position: VENT (Ventilation)
c. Intake position: Recirculation
d. Temperature setting: Max cold
e. Fan speed: High
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Stop engine and perform leak check again following steps 4 through 6 above.
Refrigerant leaks should be checked immediately after stopping
the engine. Begin with the leak detector at the compressor. The
pressure on the high-pressure side will gradually drop after
refrigerant circulation stops and pressure on the low-pressure
side will gradually rise, as shown in the graph. Some leaks are
more easily detected when pressure is high.
SHA839E

BL-18
RADIATOR CORE SUPPORT
Revision: 2005 July 2005 FX
RADIATOR CORE SUPPORTPFP:62500
Removal and InstallationAIS004LL
REMOVAL
1. Remove the front fender protector. Refer to EI-24, "Removal and Installation" .
2. Remove the front bumper. Refer to EI-14, "
Removal and Installation" .
3. Remove the ICC. Refer to ACS-73, "
REMOVAL AND INSTALLATION" .
4. Remove the headlamp. Refer to LT- 3 7 , "
Removal and Installation" .
5. Remove the washer tank. Refer to WW-36, "
Removal and Installation of Washer Tank" .
6. Remove the resonator. Refer to EM-17, "
AIR CLEANER AND AIR DUCT" or EM-176, "AIR CLEANER
AND AIR DUCT" .
7. Remove the power steering oil cooler. Refer to PS-41, "
HYDRAULIC LINE" .
8. Remove the ambient sensor. Refer to AT C - 11 7 , "
Removal and Installation" .
9. Remove the crash zone sensor. Refer to SRS-42, "
Removal and Installation" .
10. Remove the horn connector, cooling fan connector and harness clip.
11. Remove the hood lock and disconnect hood lock control cable. Refer to BL-15, "
Removal and Installation
of Hood Lock Control" .
12. Remove the reservoir tank. Refer to CO-41, "
Removal and Installation" or CO-14, "Removal and Installa-
tion" .
13. Remove mounting blots and remove radiator core support. Remove mounting bolts with power tool.
1. Radiator core support assembly 2. Bolt 3. Bolt
4. Horn (High) 5. Air guide (RH) 6. Cooling fan
7. Air guide (LH) 8. Horn (Low)
PIIA6018E

RADIATOR CORE SUPPORT BL-19
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14. After remove radiator core support, remove the horn, cooling fan.
INSTALLATION
Install in the reverse order of removal.

CO-1
ENGINE COOLING SYSTEM
B ENGINE
CONTENTS
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ENGINE COOLING SYSTEM
VQ35DE
PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 3
Precautions for Liquid Gasket ............................. ..... 3
REMOVAL OF LIQUID GASKET SEALING ..... ..... 3
LIQUID GASKET APPLICATION PROCEDURE ..... 3
PREPARATION ...................................................... ..... 5
Special Service Tools .......................................... ..... 5
Commercial Service Tools ................................... ..... 6
OVERHEATING CAUSE ANALYSIS ..................... ..... 7
Troubleshooting Chart ......................................... ..... 7
COOLING SYSTEM ............................................... ..... 9
Cooling Circuit ..................................................... ..... 9
System Chart ...................................................... ... 10
ENGINE COOLANT ............................................... ....11
Inspection ............................................................ .... 11
LEVEL CHECK ................................................ .... 11
LEAK CHECK .................................................. .... 11
Changing Engine Coolant ................................... .... 11
DRAINING ENGINE COOLANT ...................... .... 11
REFILLING ENGINE COOLANT ..................... ... 12
FLUSHING COOLING SYSTEM ...................... ... 13
RADIATOR ............................................................. ... 14
Components ........................................................ ... 14
Removal and Installation ..................................... ... 14
REMOVAL ........................................................ ... 14
INSTALLATION ................................................ ... 15
INSPECTION AFTER INSTALLATION ............ ... 15
Checking Radiator Cap ....................................... ... 15
Checking Radiator ............................................... ... 16
RADIATOR (ALUMINUM TYPE) ........................... ... 17
Components ........................................................ ... 17
Disassembly and Assembly ................................ ... 17
PREPARATION ................................................ ... 17
DISASSEMBLY ................................................ ... 17
ASSEMBLY ...................................................... ... 18
INSPECTION ................................................... ... 20 COOLING FAN .......................................................
... 21
Components ........................................................ ... 21
Removal and Installation ..................................... ... 21
REMOVAL ........................................................ ... 21
INSTALLATION ................................................ ... 21
INSPECTION AFTER INSTALLATION ............. ... 21
Disassembly and Assembly ................................. ... 21
DISASSEMBLY ................................................ ... 21
INSPECTION AFTER DISASSEMBLY ............. ... 21
ASSEMBLY ...................................................... ... 21
WATER PUMP ....................................................... ... 22
Components ........................................................ ... 22
Removal and Installation ..................................... ... 22
REMOVAL ........................................................ ... 22
INSPECTION AFTER REMOVAL .................... ... 24
INSTALLATION ................................................ ... 24
INSPECTION AFTER INSTALLATION ............. ... 25
WATER INLET AND THERMOSTAT ASSEMBLY . ... 26
Components ........................................................ ... 26
Removal and Installation ..................................... ... 26
REMOVAL ........................................................ ... 26
INSPECTION AFTER REMOVAL .................... ... 27
INSTALLATION ................................................ ... 27
INSPECTION AFTER INSTALLATION ............. ... 27
WATER OUTLET AND WATER PIPING ................ ... 28
Components ........................................................ ... 28
Removal and Installation ..................................... ... 28
REMOVAL ........................................................ ... 28
INSTALLATION ................................................ ... 29
INSPECTION AFTER INSTALLATION ............. ... 29
SERVICE DATA AND SPECIFICATIONS (SDS) ... ... 30
Standard and Limit ............................................... ... 30
ENGINE COOLANT CAPACITY (APPROXI-
MATE) ............................................................... ... 30
RADIATOR ....................................................... ... 30
THERMOSTAT ................................................. ... 30