sensor INFINITI QX4 2005 Factory Service Manual

ASSEMBLY
AT-315
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5. Tighten oil pump bolts to specified torque. Refer to AT-250,
"Components" .
CAUTION:
Apply ATF to oil pump bushing.
6. Install new O-ring to input clutch assembly.
CAUTION:

Do not reuse O-ring.

Apply ATF to O-ring.
7. Install converter housing to transmission case.
CAUTION:
Do not reuse self-sealing bolt.
8. Make sure that brake band does not close turbine revolution
sensor hole.
9. Install control valve with TCM.
a. Install A/T fluid temperature sensor 2 to bracket.
SCIA2300E
SCIA5 011 E
Converter housing
bolt: 52 N·m (5.3 kg-m, 38 ft-lb)
Self-sealing bolt : 61 N·m (6.2 kg-m, 45 ft-lb)
SCIA5171E
SCIA5034E
SCIA5264E

AT-316
ASSEMBLY
Revision: October 20052005 QX56
b. Install A/T fluid temperature sensor 2 (with bracket) in control
valve with TCM. Tighten A/T fluid temperature sensor 2 bolt to
the specified torque. Refer to AT-250, "
Components" .
CAUTION:
Adjust bolt hole of bracket to bolt hole of control valve with
TCM.
c. Install new O-ring to A/T assembly harness connector.
CAUTION:

Do not reuse O-ring.

Apply ATF to O-ring.
d. Connect TCM connector and park/neutral position switch con-
nector.
e. Install A/T assembly harness connector to control valve with
TCM.
f. Connect TCM connectors.
SCIA5301E
SCIA5155E
SCIA5449E
SCIA5450E
SCIA5447E

ASSEMBLY
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g. Install control valve with TCM in transmission case.
CAUTION:

Make sure that turbine revolution sensor securely installs
turbine revolution sensor hole.

Adjust A/T assembly harness connector of control valve
with TCM to terminal hole of transmission case.

Hang down revolution sensor harness toward outside so
as not to disturb installation of control valve with TCM.

Assemble it so that manual valve cutout is engaged with
manual plate projection.
h. Install bolts A, B and C to control valve with TCM.
i. Tighten bolt 1, 2 and 3 temporarily to prevent dislocation. After
that tighten them in order (1 → 2 → 3), and then tighten other
bolts.
j. Tighten control valve with TCM bolts to the specified torque.
Refer to AT- 2 5 0 , "
Components" .
10. Connect A/T fluid temperature sensor 2 connector.
SCIA5034E
SCIA5035E
Bolt symbol Length: mm (in) Number of bolts
A 42 (1.65) 5
B 55 (2.17) 6
C 40 (1.57) 1
SCIA5025E
SCIA5037E
SCIA5023E

AT-318
ASSEMBLY
Revision: October 20052005 QX56
11. Securely fasten terminal cord assembly and A/T fluid tempera-
ture sensor 2 harness with terminal clips.
12. Connect revolution sensor connector.
13. Securely fasten revolution sensor harness with terminal clips.
14. Pull down A/T assembly harness connector.
CAUTION:
Be careful not to damage connector.
15. Install snap ring to A/T assembly harness connector.
SCIA5446E
SCIA5024E
SCIA5293E
SCIA5299E
SCIA5300E

AT-322
SERVICE DATA AND SPECIFICATIONS (SDS)
Revision: October 20052005 QX56
Vehicle Speed When Performing and Releasing Complete Lock-upECS00CLH

At closed throttle, the accelerator opening is less than 1/8 condition.

At half throttle, the accelerator opening is 4/8 of the full opening.
Vehicle Speed When Performing and Releasing Slip Lock-upECS00CLI

At closed throttle, the accelerator opening is less than 1/8 condition.
Stall SpeedECS0 0CL J
Line PressureECS00CLK
A/T Fluid Temperature SensorECS00CLL
Turbine Revolution SensorECS0 0CL M
Vehicle Speed Sensor A/T (Revolution Sensor)ECS00CLN
Final
gear
ratioThrottle positionVehicle speed km/h (MPH)
Lock-up “ON” Lock-up “OFF”
2.937Closed throttle 74 - 82 (46 - 51) 71 - 79 (45 - 49)
Half throttle 188 - 196 (117 - 122) 136 - 144 (85 - 90)
3.357Closed throttle 65 - 73 (41 - 46) 62 - 70 (39 - 44)
Half throttle 168 - 176 (105 - 110) 118 - 126 (74 - 79)
Final
gear
ratioThrottle position Gear positionVehicle speed km/h (MPH)
Slip lock-up “ON” Slip lock-up “OFF”
2.937 Closed throttle4th 52 - 60 (33 - 38) 49 - 57 (31 - 36)
5th 52 - 60 (33 - 38) 49 - 57 (31 - 36)
3.357 Closed throttle4th 46 - 54 (29 - 34) 43 - 51 (27 - 32)
5th 46 - 54 (29 - 34) 43 - 51 (27 - 32)
Stall speed2,500 - 2,800 rpm
Engine speedLine pressure [kPa (kg/cm2 , psi)]
R position D position
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)

ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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SECTION AT C
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Revision: October 20052005 QX56 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 .............................. 6
Precautions for Leak Detection Dye ......................... 6
A/C Identification Label ............................................ 7
Precautions for Refrigerant Connection ................... 7
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ...................................................... 7
O-RING AND REFRIGERANT CONNECTION ..... 8
Precautions for Servicing Compressor ....................11
Precautions for Service Equipment .........................11
RECOVERY/RECYCLING EQUIPMENT .............11
ELECTRONIC LEAK DETECTOR .......................11
VACUUM PUMP ................................................. 12
MANIFOLD GAUGE SET .................................... 12
SERVICE HOSES ............................................... 12
SERVICE COUPLERS ........................................ 13
REFRIGERANT WEIGHT SCALE ...................... 13
CHARGING CYLINDER ...................................... 13
Wiring Diagrams and Trouble Diagnosis ................ 13
PREPARATION ......................................................... 14
Special Service Tools ............................................. 14
HFC-134a (R-134a) Service Tools and Equipment ... 14
Commercial Service Tools ...................................... 17
REFRIGERATION SYSTEM ..................................... 18
Refrigerant Cycle ................................................... 18
REFRIGERANT FLOW ....................................... 18
Refrigerant System Protection ............................... 18
REFRIGERANT PRESSURE SENSOR ............. 18
PRESSURE RELIEF VALVE .............................. 19
Component Layout ................................................. 20
FRONT REFRIGERATION SYSTEM .................. 20
REAR REFRIGERATION SYSTEM .................... 21LUBRICANT .............................................................. 22
Maintenance of Lubricant Quantity in Compressor ... 22
LUBRICANT ........................................................ 22
CHECKING AND ADJUSTING ............................ 22
AIR CONDITIONER CONTROL ............................... 24
Description .............................................................. 24
Operation ................................................................ 24
AIR MIX DOORS CONTROL .............................. 24
BLOWER SPEED CONTROL ............................. 24
INTAKE DOOR CONTROL ................................. 24
MODE DOOR CONTROL ................................... 24
DEFROSTER DOOR CONTROL ........................ 24
MAGNET CLUTCH CONTROL ........................... 25
SELF-DIAGNOSTIC SYSTEM ............................ 25
Description of Control System ................................ 26
Control Operation ................................................... 26
DISPLAY SCREEN .............................................. 27
AUTO SWITCH ................................................... 27
TEMPERATURE CONTROL DIAL (TEMPERA-
TURE CONTROL) (DRIVER SIDE) ..................... 27
TEMPERATURE CONTROL DIAL (TEMPERA-
TURE CONTROL) (PASSENGER SIDE) ............ 27
TEMPERATURE CONTROL DIAL (TEMPERA-
TURE AND MODE CONTROL) (REAR) ............. 27
RECIRCULATION () SWITCH ............................. 27
DEFROSTER () SWITCH .................................... 27
REAR WINDOW DEFOGGER SWITCH ............. 27
OFF SWITCH ...................................................... 27
A/C SWITCH ....................................................... 27
MODE SWITCH (FRONT) ................................... 27
FRONT BLOWER CONTROL DIAL .................... 27
TEMPERATURE CONTROL DIAL (TEMPERA-
TURE AND MODE CONTROL) ........................... 28
REAR BLOWER CONTROL DIAL ...................... 28
Discharge Air Flow ................................................. 29
FRONT ................................................................ 29
REAR .................................................................. 29
System Description (Front) ..................................... 30
SWITCHES AND THEIR CONTROL FUNCTION ... 30
System Description (Rear) ..................................... 31

ATC-2Revision: October 20052005 QX56 SWITCHES AND THEIR CONTROL FUNCTION ... 31
CAN Communication System Description .............. 32
TROUBLE DIAGNOSIS ............................................ 33
CONSULT-II Function (HVAC) ................................ 33
CONSULT-II BASIC OPERATION ....................... 33
SELF-DIAGNOSIS .............................................. 34
DATA MONITOR .................................................. 34
CONSULT-II Function (BCM) .................................. 36
CONSULT-II BASIC OPERATION ....................... 36
DATA MONITOR .................................................. 37
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 38
WORK FLOW ...................................................... 38
SYMPTOM TABLE .............................................. 38
Component Parts and Harness Connector Location ... 39
ENGINE COMPARTMENT .................................. 39
FRONT PASSENGER COMPARTMENT ............ 40
REAR PASSENGER COMPARTMENT ............... 41
Schematic ............................................................... 42
Wiring Diagram — A/C,A — ................................... 43
Front Air Control Terminals and Reference Value ... 53
PIN CONNECTOR TERMINAL LAYOUT ............ 53
TERMINALS AND REFERENCE VALUE FOR
FRONT AIR CONTROL ....................................... 53
A/C System Self-diagnosis Function ...................... 55
DESCRIPTION .................................................... 55
Operational Check (Front) ...................................... 57
CHECKING MEMORY FUNCTION ..................... 57
CHECKING BLOWER ......................................... 57
CHECKING DISCHARGE AIR ............................ 58
CHECKING RECIRCULATION ............................ 58
CHECKING TEMPERATURE DECREASE ......... 58
CHECKING TEMPERATURE INCREASE .......... 59
CHECK A/C SWITCH .......................................... 59
CHECKING AUTO MODE ................................... 59
Operational Check (Rear) ....................................... 60
CHECKING BLOWER ......................................... 60
CHECKING TEMPERATURE DECREASE ......... 60
CHECKING TEMPERATURE INCREASE .......... 60
Power Supply and Ground Circuit for Front Air Con-
trol ........................................................................... 61
INSPECTION FLOW ........................................... 61
COMPONENT DESCRIPTION ............................ 62
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ... 62
Mode Door Motor Circuit ........................................ 64
INSPECTION FLOW ........................................... 64
SYSTEM DESCRIPTION .................................... 65
COMPONENT DESCRIPTION ............................ 66
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ................................................... 66
Air Mix Door Motor Circuit ...................................... 70
INSPECTION FLOW ........................................... 70
SYSTEM DESCRIPTION .................................... 71
COMPONENT DESCRIPTION ............................ 72
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (DRIVER) ................................... 72
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (PASSENGER) .......................... 76
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (REAR) ......................................79
Intake Door Motor Circuit ........................................83
INSPECTION FLOW ............................................83
SYSTEM DESCRIPTION .....................................84
COMPONENT DESCRIPTION ............................85
DIAGNOSTIC PROCEDURE FOR INTAKE
DOOR MOTOR ....................................................85
Defroster Door Motor Circuit ...................................87
SYMPTOM: ..........................................................87
INSPECTION FLOW ............................................87
SYSTEM DESCRIPTION .....................................88
COMPONENT DESCRIPTION ............................88
DIAGNOSTIC PROCEDURE FOR
DEFROSTER DOOR MOTOR .............................89
Front Blower Motor Circuit ......................................93
INSPECTION FLOW ............................................93
SYSTEM DESCRIPTION .....................................94
COMPONENT DESCRIPTION ............................95
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ................................................................95
COMPONENT INSPECTION ............................. 100
Rear Blower Motor Circuit ..................................... 101
INSPECTION FLOW .......................................... 101
SYSTEM DESCRIPTION ................................... 102
DIAGNOSTIC PROCEDURE FOR REAR
BLOWER MOTOR ............................................. 102
COMPONENT INSPECTION .............................110
Rear Air Control Circuit .........................................112
INSPECTION FLOW ..........................................112
SYSTEM DESCRIPTION ...................................113
DIAGNOSTIC PROCEDURE FOR REAR AIR
CONTROL .........................................................113
Magnet Clutch Circuit ............................................115
INSPECTION FLOW ..........................................115
SYSTEM DESCRIPTION ...................................116
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH ............................................................116
Insufficient Cooling ................................................ 121
INSPECTION FLOW .......................................... 121
PERFORMANCE TEST DIAGNOSES .............. 122
PERFORMANCE CHART .................................. 124
TROUBLE DIAGNOSES FOR UNUSUAL PRES-
SURE ................................................................. 125
Insufficient Heating ............................................... 128
INSPECTION FLOW .......................................... 128
Noise ..................................................................... 129
INSPECTION FLOW .......................................... 130
Self-diagnosis ....................................................... 132
INSPECTION FLOW .......................................... 132
Memory Function .................................................. 133
INSPECTION FLOW .......................................... 133
Water Valve Circuit ................................................ 133
COMPONENT DESCRIPTION .......................... 133
DIAGNOSTIC PROCEDURE FOR WATER
VALVE ................................................................ 134
COMPONENT INSPECTION ............................. 136
Ambient Sensor Circuit ......................................... 137
COMPONENT DESCRIPTION .......................... 137
AMBIENT TEMPERATURE INPUT PROCESS . 137

ATC-3
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Revision: October 20052005 QX56 DIAGNOSTIC PROCEDURE FOR AMBIENT
SENSOR ........................................................... 137
COMPONENT INSPECTION ............................ 139
In-vehicle Sensor Circuit ...................................... 140
COMPONENT DESCRIPTION ......................... 140
DIAGNOSTIC PROCEDURE FOR IN-VEHICLE
SENSOR ........................................................... 141
COMPONENT INSPECTION ............................ 143
Optical Sensor Circuit .......................................... 143
COMPONENT DESCRIPTION ......................... 143
OPTICAL INPUT PROCESS ............................ 143
DIAGNOSTIC PROCEDURE FOR OPTICAL
SENSOR ........................................................... 144
Intake Sensor Circuit ............................................ 145
COMPONENT DESCRIPTION ......................... 145
DIAGNOSTIC PROCEDURE FOR INTAKE SEN-
SOR .................................................................. 145
COMPONENT INSPECTION ............................ 146
CONTROL UNIT ..................................................... 147
Removal and Installation ...................................... 147
FRONT AIR CONTROL .................................... 147
REAR AIR CONTROL ....................................... 147
AMBIENT SENSOR ................................................ 148
Removal and Installation ...................................... 148
REMOVAL ......................................................... 148
INSTALLATION ................................................. 148
IN-VEHICLE SENSOR ............................................ 149
Removal and Installation ...................................... 149
REMOVAL ......................................................... 149
INSTALLATION ................................................. 149
OPTICAL SENSOR ................................................ 150
Removal and Installation ...................................... 150
INTAKE SENSOR ................................................... 151
Removal and Installation ...................................... 151
REMOVAL ......................................................... 151
INSTALLATION ................................................. 151
BLOWER MOTOR .................................................. 152
Components ......................................................... 152
Removal and Installation ...................................... 152
FRONT BLOWER MOTOR ............................... 152
REAR BLOWER MOTOR ................................. 153
IN-CABIN MICROFILTER ....................................... 154
Removal and Installation ...................................... 154
FUNCTION ........................................................ 154
REPLACEMENT TIMING .................................. 154
REPLACEMENT PROCEDURE ....................... 154
HEATER & COOLING UNIT ASSEMBLY .............. 156
Components ......................................................... 156
Removal and Installation ...................................... 157
FRONT HEATER AND COOLING UNIT ASSEM-
BLY .................................................................... 157
REAR HEATER AND COOLING UNIT ASSEM-
BLY .................................................................... 158
Removal and Installation for Rear Heater Core
Pipes .................................................................... 158
REMOVAL ......................................................... 158
INSTALLATION ................................................. 159
HEATER CORE ...................................................... 160Components .........................................................160
Removal and Installation ......................................161
FRONT HEATER CORE ...................................161
REAR HEATER CORE ......................................162
DEFROSTER DOOR MOTOR ................................163
Removal and Installation ......................................163
REMOVAL .........................................................163
INSTALLATION .................................................163
INTAKE DOOR MOTOR .........................................164
Removal and Installation ......................................164
REMOVAL .........................................................164
INSTALLATION .................................................164
MODE DOOR MOTOR ............................................165
Removal and Installation ......................................165
REMOVAL .........................................................165
INSTALLATION .................................................165
AIR MIX DOOR MOTOR .........................................166
Components .........................................................166
Removal and Installation ......................................166
FRONT AIR MIX DOOR MOTOR (DRIVER) .....166
FRONT AIR MIX DOOR MOTOR (PASSENGER) .167
REAR AIR MIX DOOR MOTOR ........................167
VARIABLE BLOWER CONTROL ...........................168
Removal and Installation ......................................168
REMOVAL .........................................................168
INSTALLATION .................................................168
REAR BLOWER MOTOR RESISTOR ....................169
Removal and Installation ......................................169
REMOVAL .........................................................169
INSTALLATION .................................................169
DUCTS AND GRILLES ...........................................170
Components .........................................................170
Removal and Installation ......................................173
CENTER CONSOLE HEAT DUCT AND REAR
FINISHER ASSEMBLY GRILLE ........................173
DEFROSTER NOZZLE .....................................173
RH AND LH SIDE DEMISTER DUCT ...............173
RH AND LH VENTILATOR DUCT .....................173
CENTER VENTILATOR DUCT .........................173
FLOOR DUCT ...................................................173
REAR OVERHEAD DUCTS ..............................173
REAR FLOOR DUCT ........................................174
GRILLES ...........................................................174
REFRIGERANT LINES ...........................................175
HFC-134a (R-134a) Service Procedure ...............175
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................175
Components .........................................................177
Removal and Installation for Compressor ............179
REMOVAL .........................................................179
INSTALLATION .................................................180
Removal and Installation for Compressor Clutch . 180
REMOVAL .........................................................180
INSPECTION ....................................................181
INSTALLATION .................................................181
BREAK-IN OPERATION ....................................183
Removal and Installation for Low-pressure Flexible
Hose .....................................................................183
REMOVAL .........................................................183

ATC-4Revision: October 20052005 QX56 INSTALLATION ..................................................183
Removal and Installation for High-pressure Flexible
Hose .....................................................................183
REMOVAL .........................................................183
INSTALLATION ..................................................183
Removal and Installation for High-pressure Pipe . 183
REMOVAL .........................................................183
INSTALLATION ..................................................183
Removal and Installation for Low-pressure Pipe ..184
REMOVAL .........................................................184
INSTALLATION ..................................................184
Removal and Installation for Underfloor Rear A/C
Pipes .....................................................................184
REMOVAL .........................................................184
INSTALLATION ..................................................184
Removal and Installation for Rear A/C Pipes .......184
REMOVAL .........................................................184
INSTALLATION ..................................................184
Removal and Installation for Refrigerant Pressure
Sensor ..................................................................185
REMOVAL .........................................................185
INSTALLATION ..................................................185
Removal and Installation for Condenser ...............185
REMOVAL .........................................................185
INSTALLATION ..................................................185
Removal and Installation for Front Evaporator .....186REMOVAL .......................................................... 186
INSTALLATION .................................................. 187
Removal and Installation for Rear Evaporator ...... 187
REMOVAL .......................................................... 188
INSTALLATION .................................................. 188
Removal and Installation for Front Expansion Valve . 188
REMOVAL .......................................................... 188
INSTALLATION .................................................. 188
Removal and Installation for Rear Expansion Valve . 188
REMOVAL .......................................................... 188
INSTALLATION .................................................. 189
Checking for Refrigerant Leaks ............................ 189
Checking System for Leaks Using the Fluorescent
Dye Leak Detector ................................................ 189
Dye Injection ......................................................... 189
Electronic Refrigerant Leak Detector .................... 190
PRECAUTIONS FOR HANDLING LEAK
DETECTOR ....................................................... 190
CHECKING PROCEDURE ................................ 191
SERVICE DATA AND SPECIFICATIONS (SDS) .... 193
Service Data and Specifications (SDS) ................ 193
COMPRESSOR ................................................. 193
LUBRICANT ....................................................... 193
REFRIGERANT ................................................. 193
ENGINE IDLING SPEED ................................... 193
BELT TENSION ................................................. 193

PRECAUTIONS
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A/C Identification LabelEJS003WT
Vehicles with factory installed fluorescent dye have this identification
label on the underside of hood.
Precautions for Refrigerant ConnectionEJS003WU
A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.

Expansion valve to cooling unit

Evaporator pipes to evaporator (inside cooling unit)

Refrigerant pressure sensor
FEATURES OF NEW TYPE REFRIGERANT CONNECTION

The O-ring has been relocated. It has also been provided with a groove for proper installation. This
reduces the possibility of the O-ring being caught in, or damaged by, the mating part. The sealing direction
of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing
characteristics.

The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facil-
itating piping connections.
WJIA0672E
SHA8 15 E