Temperature sensor INFINITI FX35 2004 Repair Manual

AT-344
ASSEMBLY
Revision: 2004 November 2004 FX35/FX45
f. Tighten bolt 1, 2 and 3 temporarily to prevent dislocation. After
that tighten them in order (1 → 2 → 3), and then tighten other
bolts.
10. Connect A/T fluid temperature sensor 2 connector.
11. Securely fasten A/T fluid temperature sensor 2 harness with ter-
minal clip.
12. Connect revolution sensor connector.
Bolt symbol Length mm (in) Number of bolts
A 42 (1.65) 5
B 55 (2.17) 6
C 40 (1.57) 1
SCIA5025E
: 7.9 N·m (0.81 kg-m, 70 in-lb)
SCIA5037E
SCIA5023E
SCIA5146E
SCIA5024E

AT-350
SERVICE DATA AND SPECIFICATIONS (SDS)
Revision: 2004 November 2004 FX35/FX45

At closed throttle, the accelerator opening is less than 1/8 condition.
Stall SpeedACS002S6
Line PressureACS002S7
A/T Fluid Temperature SensorACS007HG
Turbine Revolution SensorACS007HH
Vehicle Speed Sensor A/T (Revolution Sensor)ACS007HI
Reverse BrakeACS007HJ
*: Always check with the Parts Department for the latest parts information.Engine modelVQ35DE
Stall speed2,650 - 2,950 rpm
Engine modelVK45DE
Stall speed2,300 - 2,600 rpm
Engine speedLine pressure kPa (kg/cm
2 , psi)
R position D, M positions
At idle speed 392 - 441 (4.0 - 4.5, 57 - 64) 373 - 422 (3.8 - 4.3, 54 - 61)
At stall speed 1,700 - 1,890 (17.3 - 19.3, 247 - 274) 1,310 - 1,500 (13.3 - 15.3, 190 - 218)
Name Condition CONSULT-II “DATA MONITOR” (Approx.) (V) Resistance (Approx.) (kΩ)
A/T fluid temperature sensor 10°C (32°F) 2.2 15
20°C (68°F) 1.8 6.5
80°C (176°F) 0.6 0.9
A/T fluid temperature sensor 20°C (32°F) 2.2 10
20°C (68°F) 1.7 4
80°C (176°F) 0.45 0.5
Name Condition Data (Approx.)
Turbine revolution
sensor 1When running at 50 km/h (31 MPH) in 4th speed with the closed throttle position switch
“OFF”.
1.3 (kHz)
Turbine revolution
sensor 2When moving at 20 km/h (12 MPH) in 1st speed with the closed throttle position switch
“OFF”.
Name Condition Data (Approx.)
Revolution sensor When moving at 20 km/h (12 MPH). 185 (Hz)
Thickness of retaining platesThickness mm (in) Part number*
4.2 (0.165)
4.4 (0.173)
4.6 (0.181)
4.8 (0.189)
5.0 (0.197)
5.2 (0.205) 31667 90X14
31667 90X15
31667 90X16
31667 90X17
31667 90X18
31667 90X19

ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
C
D
E
F
G
H
I
K
L
M
SECTION AT C
A
B
AT C
Revision: 2004 November 2004 FX35/FX45
AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 5
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 5
Precautions for Working with HFC-134a (R-134a) ..... 5
CONTAMINATED REFRIGERANT ....................... 5
General Refrigerant Precautions .............................. 7
Lubricant Precautions .............................................. 7
Precautions for Refrigerant Connection ................... 8
ABOUT ONE-TOUCH JOINT ................................ 8
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION .................................................... 10
O-RING AND REFRIGERANT CONNECTION .... 11
Precautions for Servicing Compressor ................... 13
Precautions for Service Equipment ........................ 13
RECOVERY/RECYCLING EQUIPMENT ............ 13
ELECTRONIC LEAK DETECTOR ...................... 13
VACUUM PUMP ................................................. 14
MANIFOLD GAUGE SET .................................... 14
SERVICE HOSES ............................................... 14
SERVICE COUPLERS ........................................ 15
REFRIGERANT WEIGHT SCALE ...................... 15
CHARGING CYLINDER ...................................... 15
Precautions for Leak Detection Dye ....................... 16
IDENTIFICATION ................................................ 16
IDENTIFICATION LABEL FOR VEHICLE ........... 16
Wiring Diagrams and Trouble Diagnosis ................ 16
PREPARATION ......................................................... 17
Special Service Tools ............................................. 17
HFC-134a (R-134a) Service Tools and Equipment ... 18
Commercial Service Tools ...................................... 20
REFRIGERATION SYSTEM ..................................... 21
Refrigerant Cycle ................................................... 21
REFRIGERANT FLOW ....................................... 21
FREEZE PROTECTION ..................................... 21
Refrigerant System Protection ............................... 21
REFRIGERANT PRESSURE SENSOR ............. 21
PRESSURE RELIEF VALVE ............................... 21
V-6 Variable Displacement Compressor ................. 22
GENERAL INFORMATION ................................. 22DESCRIPTION .................................................... 23
Component Layout ................................................. 26
LUBRICANT .............................................................. 27
Maintenance of Lubricant Quantity in Compressor ... 27
LUBRICANT ........................................................ 27
LUBRICANT RETURN OPERATION .................. 27
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR .................................................. 28
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT ....................... 29
AIR CONDITIONER CONTROL ............................... 30
Description of Air Conditioner LAN Control System ... 30
System Construction .............................................. 30
OPERATION ........................................................ 30
TRANSMISSION DATA AND TRANSMISSION
ORDER ............................................................... 31
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL) ..................................... 32
FAN SPEED CONTROL ...................................... 32
INTAKE DOOR CONTROL ................................. 32
OUTLET DOOR CONTROL ................................ 32
MAGNET CLUTCH CONTROL ........................... 33
SELF-DIAGNOSTIC SYSTEM ............................ 33
Description of Control System ................................ 34
Control Operation ................................................... 34
DISPLAY SCREEN .............................................. 35
AUTO SWITCH ................................................... 35
TEMPERATURE SWITCH (POTENTIO TEM-
PERATURE CONTROL) (DRIVER SIDE) ........... 35
TEMPERATURE SWITCH (POTENTIO TEM-
PERATURE CONTROL) (PASSENGER SIDE) ... 35
RECIRCULATION (REC) SWITCH ..................... 35
FRESH (FRE) SWITCH ...................................... 35
DEFROSTER (DEF) SWITCH ............................. 35
REAR WINDOW DEFOGGER SWITCH ............. 35
OFF SWITCH ...................................................... 35
A/C SWITCH ....................................................... 35
MODE SWITCH .................................................. 35
FAN SWITCH ...................................................... 35

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

ATC-12
PRECAUTIONS
Revision: 2004 November 2004 FX35/FX45
CAUTION:
The new and former refrigerant connections use different O-ring configurations. Do not confuse O-
rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or
around, the connection.
O-Ring Part Numbers and Specifications
WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.

When the compressor is removed, store it in the same position as it is when mounted on the car.
Malfunction to do so will cause lubricant to enter the low-pressure chamber.

When connecting tubes, always use a torque wrench and a back-up wrench.

After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.

When installing an air conditioner in the vehicle, connect the pipes as the final stage of the opera-
tion. Do not remove the seal caps of pipes and other components until just before required for
connection.

Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.

Thoroughly remove moisture from the refrigeration system before charging the refrigerant.

Always replace used O-rings.

When connecting tube, apply lubricant to circle of the O-rings shown in illustration. Be careful not
to apply lubricant to threaded portion.
Lubricant name: Nissan A/C System Oil Type S
Part number: KLH00-PAGS0

O-ring must be closely attached to dented portion of tube.

When replacing the O-ring, be careful not to damage O-ring and tube.

Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that
the O-ring is installed to tube correctly.
Connection type Piping connection point Part number QTY O-ring size
NewLow-pressure pipe 1 to low-pressure pipe 2 (One-touch joint) 92473 N8221 2 16
Low-pressure pipe 2 to expansion valve 92473 N8210 1 16
High-pressure pipe 1 to high-pressure pipe 2 (One-touch joint) 92471 N8221 2 8
High-pressure pipe 3 to expansion valve 92471 N8210 1 8
High-pressure pipe 2 to high-pressure pipe 3 (One-touch joint) 92471 N8221 2 8
Condenser to high-pressure flexible hose (One-touch joint) 92472 N8221 2 12
Condenser to high-pressure pipe 1 (One-touch joint) 92471 N8221 2 8
Low-pressure flexible hose to low-pressure pipe 1 (One-touch
joint)92473 N8221 2 16
Compressor to low-pressure flexible hose 92474 N8210 1 19
Compressor to high-pressure flexible hose 92472 N8210 1 12
Liquid tank to condenser pipeInlet
92471 N82101
8
Outlet 1
FormerRefrigerant pressure sensor to condenser J2476 89956 1 10
Expansion valve to evaporatorInlet 92475 71L00 1 12
Outlet 92475 72L00 1 16

REFRIGERATION SYSTEM
ATC-21
C
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F
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MA
B
AT C
Revision: 2004 November 2004 FX35/FX45
REFRIGERATION SYSTEMPFP:KA990
Refrigerant CycleAJS00146
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is
controlled by an externally equalized expansion valve, located inside the evaporator case.
FREEZE PROTECTION
Under usual operating conditions, when the A/C is switched on, the compressor runs continuously, and the
evaporator pressure, and therefore, temperature is controlled by the compressor to prevent freeze up.
Refrigerant System ProtectionAJS00147
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low-pressure by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above, or falls below the specifications, the refrig-
erant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm
2 , 398 psi), or below about 134 kPa
(1.4 kg/cm
2 , 20 psi).
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an unusual level [more than 3,727 kPa (38 kg/cm
2
, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the
atmosphere.
RJIA0849E

TROUBLE DIAGNOSIS
ATC-53
C
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F
G
H
I
K
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MA
B
AT C
Revision: 2004 November 2004 FX35/FX45
Self-diagnosis FunctionAJS0014P
DESCRIPTION
The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from usual control to the self-diagnostic system is accomplished by
starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. The OFF
switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system
will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step to
another is accomplished by means of pressing temperature switch (driver side), as required.
Additionally shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing (fan)
UP switch.
RJIA1967E

ATC-54
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
FUNCTION CONFIRMATION PROCEDURE
1. SET IN SELF-DIAGNOSTIC MODE
1. Turn ignition switch ON.
2. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.
CAUTION:

If battery voltage drops below 12V during diagnosis STEP-3, actuator speed becomes slower and
as a result, the system may generate an error even when operation is usual. To avoid this, start
engine before performing this diagnosis.

Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis func-
tion.
>> GO TO 2.
2. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Does code No. 20 appear on the display?
YES >> GO TO 3.
NO >> GO TO 13.
3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP-3
Press temperature (UP) switch (driver side).
Advance to self
-diagnosis STEP-3?
YES >> GO TO 4.
NO >> Malfunctioning OFF switch or unified meter and A/C amp. Refer to ATC-102, "
Self-diagnosis" .
4. CHECK TO RETURN SELF-DIAGNOSIS STEP-2
Press temperature (DOWN) switch (driver side).
Return to self
-diagnosis STEP-2?
YES >> GO TO 5.
NO >> Replace A/C and AV switch. Temperature switch malfunctions.
5. STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Press temperature (UP) switch (driver side).
Does code No. 30 appear on the display?
YES >> GO TO 6.
NO >> GO TO 14.
RJIA0219E
RJIA0220E

ATC-56
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
8. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1. Press temperature (UP) switch (driver side).
2. Code No. 51 appears on the display.
>> GO TO 9.
9. CHECK AMBIENT SENSOR
Press (DEF) switch one time. Temperature detected by ambient
sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 10.
NG >> Go to Ambient Sensor Circuit. Refer to ATC-104, "
Ambi-
ent Sensor Circuit" .
10. CHECK IN-VEHICLE SENSOR
Press (DEF) switch a second time. Temperature detected by in-
vehicle sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 11.
NG >> Go to In-vehicle Sensor Circuit. Refer to ATC-107, "
In-
vehicle Sensor Circuit" .
11 . CHECK INTAKE SENSOR
Press (DEF) switch a third time. Temperature detected by intake
sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 12.
NG >> Go to Intake Sensor Circuit. Refer to AT C - 11 3 , "
Intake
Sensor Circuit" .
RJIA0223E
RJIA1271E
RJIA1272E

ATC-64
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
COMPONENT DESCRIPTION
Unified Meter and A/C amp. (Automatic Amplifier)
The unified meter and A/C amp. has a built-in microcomputer which
processes information sent from various sensors needed for air con-
ditioner operation. The air mix door motor, mode door motor, intake
door motor, blower motor and compressor are then controlled.
The unified meter and A/C amp. is unitized with control mechanisms.
When the various switches and temperature switch are operated,
data is input to the unified meter and A/C amp. from the DISPLAY
UNIT/DISPLAY C/U using CAN communication.
Self-diagnostic functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi-
tioner system.
Potentio Temperature Control (PTC)
The PTC is built into the A/C and AV switch. It can be set at an inter-
val of 0.5°C (1.0°F) in the 18°C (60°F) to 32°C (90°F) temperature
range by pressing temperature switch. The set temperature is dis-
played.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
RJIA1965E
RJIA1982E
RJIA1983E