Wiring DiagramNJEC0786
YEC331A
AIR CONDITIONER CONTROLYD
Wiring Diagram
EC-212
CAN COMMUNICATION
AT-109
[EURO-OBD]
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CAN COMMUNICATIONPFP:23710
System DescriptionECS007O2
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication UnitECS007O3
×:Applicable
TYPE1
System diagram
Input/output signal chart
T: Transmit R: Receive Body type Sedan/ 5DH/B/ 3DH/B
Axle2WD
Engine QG18DE QG15DE/QG18DE
Transmission A/T M/T
Brake controlABS
CAN communication unit
ECM××
TCM×
Smart entrance control unit××
Data link connector××
Combination meter××
CAN communication type AT-109, "
TYPE1"AT-110, "TYPE 2"
SEL825Y
Signals ECM TCMSmart entrance
control unitCombination meter
Engine speed signal T R
Brake switch signal R T
Rear window defogger signal R T
Heater fan switch signal R T
Air conditioner switch signal R T
MI signal T R
Current gear position signal T R
Engine coolant temperature signal T R
Fuel consumption signal T R
AT-110
[EURO-OBD]
CAN COMMUNICATION
TYPE 2
System diagram
Input/output signal chart
T: Transmit R: Receive Vehicle speed signal R T
Seat belt reminder signalRT
Headlamp switch signalTR
Flashing indicator signalTR
Engine cooling fan speed signal T R
Child lock indicator signalTR
Door switches state signalTR
A/C compressor signal T R
Accelerator pedal position signal T R
Output shaft revolution signal R T
OD OFF switch signal R T
OD OFF indicator signal T R
A/T self-diagnosis signal R TSignals ECM TCMSmart entrance
control unitCombination meter
SEL826Y
Signals ECMSmart entrance control
unitCombination meter
Engine speed signal T R
Rear window defogger signal R T
Heater fan switch signal R T
Air conditioner switch signal R T
MI signal T R
Engine coolant temperature signal T R
Fuel consumption signal T R
Vehicle speed signal R T
Seat belt reminder signal R T
Headlamp switch signal T R
Flashing indicator signal T R
Engine cooling fan speed signal T R
Child lock indicator signal T R
Door switches state signal T R
A/C compressor signal T R
CAN COMMUNICATION
AT-305
[EXC.F/EURO-OBD]
D
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H
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MA
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AT
CAN COMMUNICATIONPFP:23710
System DescriptionECS007QX
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication UnitECS007QY
×:Applicable
TYPE 1
System diagram
Input/output signal chart
T: Transmit R: Receive Body type Sedan/ 5DH/B/ 3DH/B
Axle2WD
Engine QG18DE QG15DE/QG18DE
Transmission A/T M/T
Brake controlABS
CAN communication unit
ECM××
TCM×
Smart entrance control unit××
Data link connector××
Combination meter××
CAN communication type AT-305, "
TYPE 1"AT- 3 0 6 , "TYPE 2"
SEL825Y
Signals ECM TCMSmart entrance
control unitCombination meter
Engine speed signal T R
Brake switch signal R T
Rear window defogger signal R T
Heater fan switch signal R T
Air conditioner switch signal R T
MI signal T R
Current gear position signal T R
Engine coolant temperature signal T R
Fuel consumption signal T R
AT-306
[EXC.F/EURO-OBD]
CAN COMMUNICATION
TYPE 2
System diagram
Input/output signal chart
T: Transmit R: Receive Vehicle speed signal R T
Seat belt reminder signalRT
Headlamp switch signalTR
Flashing indicator signalTR
Engine cooling fan speed signal T R
Child lock indicator signalTR
Door switches state signalTR
A/C compressor signal T R
Accelerator pedal position signal T R
Output shaft revolution signal R T
OD OFF switch signal R T
OD OFF indicator signal T R
A/T self-diagnosis signal R TSignals ECM TCMSmart entrance
control unitCombination meter
SEL826Y
Signals ECMSmart entrance control
unitCombination meter
Engine speed signal T R
Rear window defogger signal R T
Heater fan switch signal R T
Air conditioner switch signal R T
MI signal T R
Engine coolant temperature signal T R
Fuel consumption signal T R
Vehicle speed signal R T
Seat belt reminder signal R T
Headlamp switch signal T R
Flashing indicator signal T R
Engine cooling fan speed signal T R
Child lock indicator signal T R
Door switches state signal T R
A/C compressor signal T R
ATC-1
AUTOMATIC AIR CONDITIONER
J AIR CONDITIONER
CONTENTS
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SECTION
A
B
AT C
AUTOMATIC AIR CONDITIONER
PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
Precautions for Working with HFC-134a (R-134a) ..... 4
General Refrigerant Precautions .............................. 4
Lubricant Precautions .............................................. 5
Precautions for Refrigerant Connection ................... 5
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ...................................................... 5
O-RING AND REFRIGERANT CONNECTION ..... 6
Precautions for Servicing Compressor ..................... 7
Precautions for Service Equipment .......................... 7
RECOVERY/RECYCLING EQUIPMENT .............. 7
ELECTRONIC LEAK DETECTOR ........................ 8
VACUUM PUMP ................................................... 8
MANIFOLD GAUGE SET ...................................... 8
SERVICE HOSES ................................................. 8
SERVICE COUPLERS .......................................... 9
REFRIGERANT WEIGHT SCALE ........................ 9
CALIBRATING ACR4 WEIGHT SCALE ................ 9
CHARGING CYLINDER ........................................ 9
Precautions for Leak Detection Dye ......................... 9
IDENTIFICATION ................................................ 10
IDENTIFICATION LABEL FOR VEHICLE ........... 10
Wiring Diagrams and Trouble Diagnosis ................ 10
PREPARATION ..........................................................11
Special Service Tools .............................................. 11
HFC-134a (R-134a) Service Tools and Equipment .... 11
REFRIGERATION SYSTEM ..................................... 15
Refrigerant Cycle ................................................... 15
REFRIGERANT FLOW ....................................... 15
FREEZE PROTECTION ..................................... 15
Refrigerant System Protection ............................... 15
REFRIGERANT PRESSURE SENSOR (WITH
GASOLINE ENGINE) .......................................... 15
DUAL-PRESSURE SWITCH (WITH DIESEL
ENGINE) ............................................................. 15
PRESSURE RELIEF VALVE ............................... 15
CSV613 Variable Displacement Compressor ......... 16GENERAL INFORMATION ................................. 16
DESCRIPTION .................................................... 16
Component Layout ................................................. 19
LUBRICANT .............................................................. 20
Maintenance of Lubricant Quantity in Compressor ... 20
LUBRICANT ........................................................ 20
LUBRICANT RETURN OPERATION .................. 20
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR .................................................. 21
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT ....................... 21
AIR CONDITIONER CONTROL ............................... 22
Overview Air Conditioner LAN Control System ...... 22
System Construction .............................................. 22
OPERATION ........................................................ 22
TRANSMISSION DATA AND TRANSMISSION
ORDER ............................................................... 23
AIR MIX DOOR CONTROL (AUTOMATIC TEM-
PERATURE CONTROL) ..................................... 23
FAN SPEED CONTROL ...................................... 24
INTAKE DOOR CONTROL ................................. 24
OUTLET DOOR CONTROL ................................ 24
MAGNET CLUTCH CONTROL ........................... 24
SELF-DIAGNOSTIC SYSTEM ............................ 24
Overview of Control system .................................... 24
Control Operation ................................................... 25
DISPLAY SCREEN .............................................. 25
AUTO SWITCH ................................................... 25
TEMPERATURE DIAL (POTENTIO TEMPERA-
TURE CONTROL) ............................................... 25
A/C SWITCH ....................................................... 25
DEFROSTER (DEF) SWITCH ............................. 25
MODE SWITCH .................................................. 25
FAN SWITCH ...................................................... 25
OFF SWITCH ...................................................... 25
FRESH (FRE) SWITCH ...................................... 25
RECIRCULATION (REC) SWITCH ..................... 26
REAR WINDOW DEFOGGER SWITCH ............. 26
Fail-safe Function ................................................... 26
PRECAUTIONS
ATC-7
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●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.
●After connecting line, conduct leak test and make sure that there is no leakage from connections.
When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten con-
nections of seal seat to the specified torque.
Precautions for Servicing CompressorEJS001YU
●Plug all openings to prevent moisture and foreign matter from entering.
●When the compressor is removed, store it in the same position as it is when mounted on the car.
●When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compres-
sor” exactly. Refer to ATC-20, "
Maintenance of Lubricant Quantity in Compressor" .
●Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with lubri-
cant, wipe it off by using a clean waste cloth moistened with thinner.
●After compressor service operation, turn the compressor shaft by hand more than five turns in
both directions. This will equally distribute lubricant inside the compressor. After the compressor
is installed, let the engine idle and operate the compressor for one hour.
●After replacing the compressor magnet clutch, apply voltage to the new one and check for usual
operation.
Precautions for Service EquipmentEJS001YV
RECOVERY/RECYCLING EQUIPMENT
Be certain to follow the manufacturers instructions for machine operation and machine maintenance. Never
introduce any refrigerant other than that specified into the machine.
RHA861F
ATC-22
AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
PFP:27500
Overview Air Conditioner LAN Control SystemEJS001Z5
The LAN system consists of auto amp., mode door motor, air mix door motor and intake door motor.
A configuration of these components is shown in the diagram below.
System ConstructionEJS001Z6
A small network is constructed between the auto amplifier, air mix door motor and mode door motor. The auto
amplifier and motors are connected by data transmission lines and motor power supply lines. The LAN net-
work is built through the ground circuits of the two motors.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the auto amplifier and two motors.
The following functions are contained in LCUs built into the air mix door motor and the mode door motor.
●Address
●Motor opening angle signals
●Data transmission
●Motor stop and drive decision
●Opening angle sensor (PBR function)
●Comparison
●Decision (Auto amplifier indicated value and motor opening angle comparison)
OPERATION
The auto amplifier receives data from each of the sensors. The amplifier sends mode door, air mix door and
intake door opening angle data to the mode door motor LCU, air mix door motor LCU and intake door motor
LCU.
The mode door motor, air mix door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the auto amplifier and each of the motor posi-
tion sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD, DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection
data is returned to the auto amplifier.
RJIA0480E
RHA350H