sensor NISSAN NAVARA 2005 Repair Workshop Manual

MTC-10
PRECAUTIONS
A/C Compressor and Condenser —RHD Models—
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.
MJIB0277E
1. High-pressure service valve 2. Clip 3. High-pressure A/C pipe
4. Refrigerant pressure sensor 5. Condenser 6. Compressor shaft seal
7. High-pressure flexible A/C hose 8. Low-pressure flexible A/C hose 9. Low-pressure service valve
10. Low-pressure A/C pipe 11. Expansion valve 12. A/C drain hose

MTC-20
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
PFP:KA990
Refrigerant CycleEJS0062E
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 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 V-6 variable displacement compressor to
prevent freeze up.
Refrigerant System ProtectionEJS005FT
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above or falls below the specifications, the refriger-
ant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.
The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch 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 120 kPa (1.22 kg/cm
2,17.4psi).

MTC-26
AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
PFP:27500
DescriptionEJS005FW
The front air control provides regulation of the vehicle's interior temperature. The system is based on the posi-
tion of the front air controls temperature switch selected by the driver. This is done by utilizing a microcom-
puter, also referred to as the front air control, which receives input signals from the following three sensors:
lIntake sensor
lPBR (Position Balanced Resistor).
The front air control uses these signals (including the set position of the temperature switch) to control:
lOutlet air volume
lAir temperature
lAir distribution
The front air control is used to select:
lOutlet air volume
lAir temperature/distribution
OperationEJS005FX
AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature
switch.
BLOWER SPEED CONTROL
Blower speed is controlled based on front blower switch settings.
When blower switch is turned, the blower motor starts and increases air flow volume each time the blower
switch is turned counterclockwise, and decreases air flow volume each time the blower switch is turned coun-
terclockwise.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (defroster) switch setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode switch.
DEFROSTER DOOR CONTROL
The defroster door is controlled by: Turning the defroster dial to front defroster.

AIR CONDITIONER CONTROL
MTC-27
C
D
E
F
G
H
I
K
L
MA
B
MTC
MAGNET CLUTCH CONTROL
When the A/C switch is pressed, or the mode switch is turned to the defroster position, the front air control out-
puts a compressor ON signal to BCM.
The BCM then sends a compressor ON signal to ECM, via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-
sor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON sig-
nal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
SELF-DIAGNOSTIC SYSTEM
The self-diagnostic system is built into the front air control to quickly locate the cause of symptoms. Refer to
MTC-51, "
A/C System Self-diagnosis Function".
MJIB0218E

MTC-28
AIR CONDITIONER CONTROL
Description of Control System
EJS005FY
The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
The relationship of these components is shown in the figure below:
Control OperationEJS005FZ
Front air control
MJIB0219E
MJIB0222E

TROUBLE DIAGNOSIS
MTC-49
C
D
E
F
G
H
I
K
L
MA
B
MTC
Front Air Control Terminals and Reference ValueEJS005G9
Measure voltage between each terminal and ground by following
Terminals and Reference Value for front air control.
PIN CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUE FOR FRONT AIR CONTROL
MJIB0320E
MJIB0321E
Te r m i -
nal No.Wire
colorItemIgnition
switchConditionVoltage (V)
(Approx.)
1 BR Mode door motor CW ON Clockwise rotation Battery voltage
2 W Air mix door motor CW ON Clockwise rotation Battery voltage
3 G Air mix door motor CCW ON Counterclockwise rotation Battery voltage
4 Y Intake door motor CW ON Clockwise rotation Battery voltage
5 O Intake door motor CCW ON Counterclockwise rotation Battery voltage
6 P Power supply for IGN ON — Battery voltage
8 G Illumination + ON Park lamps ON Battery voltage
9 B Illumination – — Park lamps ON
10 W Compressor ON signalON A/C switch OFF 5V
ON A/C switch ON 0V
11 Y Rear defroster request ON — Battery voltage
12 L Intake sensor ON — 0 - 5V
13 V Intake sensor return
14 R Mode door motor CCW ON Counterclockwise rotation Battery voltage
18 W Blower monitor ONBlower motor OFF Battery voltage
Blower motor ON 0V
19 GR Power supply for BAT — — Battery voltage
20 B Ground — — 0V
PIIA2344E

MTC-50
TROUBLE DIAGNOSIS
21 V Mode door motor feedback ON — 0 - 5V
22 SB Air mix door motor feedback ON — 0 - 5V
23 G Sensor power ON — 5V
25 LG Rear defroster status
26 P Sensor return ON — 0 - 5V
36 PPTC heater relay 1
(LHD models)ONRelay ON Battery voltage
Relay OFF 0V
37 LGPTC heater relay 2
(LHD models)ONRelay ON Battery voltage
Relay OFF 0V
38 BRPTC heater relay 3
(LHD models)ONRelay ON Battery voltage
Relay OFF 0V
39 YSeat heater
(LHD models)ONSeat heater ON Battery voltage
Seat heater OFF 0V
40 RMirror heater
(LHD models)ONMirror heater ON Battery voltage
Mirror heater OFF 0V
41 LCAN-H
(LHD models)ON — 0 - 5V
42 PCAN-L
(LHD models)ON — 0 - 5V Te r m i -
nal No.Wire
colorItemIgnition
switchConditionVoltage (V)
(Approx.)

TROUBLE DIAGNOSIS
MTC-51
C
D
E
F
G
H
I
K
L
MA
B
MTC
A/C System Self-diagnosis FunctionEJS005GA
DESCRIPTION
The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. Refer to applicable sections
(items) for details. Shifting from usual control to the self-diagnostic system is accomplished by turning the igni-
tion switch ON and pressing all three front air control switches, after 3 seconds all three switches will illumi-
nate. After the three switches illuminate, press the A/C and rear defrost switches simultaneously. The blower
bars will flash and the ambient temperature display will indicate 0°during the self-diagnosis. Fault codes (if
any are present) will be displayed in the ambient temperature display area. Refer toMTC-52, "
SELF-DIAGNO-
SISCODECHART".
MJIB0189E

MTC-52
TROUBLE DIAGNOSIS
SELF-DIAGNOSIS CODE CHART
Code No. Reference page
02 EE changed by calibration
04 Mode switch circuit open or shortMTC-58, "
Mode Door Motor Circuit"
05 Blower motor failureMTC-71, "Blower Motor Circuit"
20 BCM not responding to A/C requestMTC-79, "Magnet Clutch Circuit"
21 BCM not responding to rear defroster requestGW-47, "REAR WINDOW DEFOGGER"
22 Air mix door motor (front) circuit failureMTC-63, "Air Mix Door Motor Circuit"
34 Front potentio temperature control (PTC) failure
36 Air mix door motor (front) PBR circuit failureMTC-63, "
Air Mix Door Motor Circuit"
38 Air mix door motor (rear) circuit failureMTC-63, "Air Mix Door Motor Circuit"
56 Intake sensor circuit short
MTC-95, "Intake Sensor Circuit"57 Intake sensor circuit open
62 Defroster door motor circuit failure
80 CAN bus fault
LAN-3, "
Precautions When Using CONSULT-II"81 BCM CAN message missing
82 Intake door motor circuit failureMTC-68, "
Intake Door Motor Circuit"
90 Stuck switch
92 Mode door motor circuit failureMTC-58, "
Mode Door Motor Circuit"

MTC-56
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Front Air Control
The front air control has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motors, mode door motor, intake door
motors, defroster door motor, blower motor and compressor are then
controlled.
The front air control is unitized with control mechanisms. When the
various switches and temperature dials are operated, data is input to
the front air control.
Self-diagnostic functions are also built into the front air control to pro-
vide quick check of malfunctions (NAVI equipped vehicles only).
Potentio Temperature Control (PTC)
The PTC is built into the front air control. It can be set from cold to
hot or any intermediate position by rotating the temperature dial.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
MJIB0320E
MJIB0230E
MJIB0190E