Nissan X-Trail 32. Manual — part 1419
SYSTEM
HAC-151
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
When intake sensor detects that evaporator fin temperature is
[
−
5.0
°
C (23.0
°
F)] or less, A/C amp. requests ECM to turn the compres-
sor OFF, and stops the compressor.
When the air temperature returns to
[1.0
°
C (33.8
°
F)] or more, the
compressor is activated.
Refrigerant Discharge Amount Control
• A/C amp. transmits the ECV control signal via CAN communication. IPDM E/R transmits the control signal to
ECV according to the received ECV control signal.
• ECV is controlled according to change in the duty ratio of the transmitted control signal.
• Except when temperature setting is full cold or outlet is DEF, A/C amp. controls the refrigerant discharge
amount according to the required cooling capacity.
• A/C amp. increases the refrigerant discharge amount when evaporator temperature is higher than the target
temperature upper limit, and reduces the refrigerant discharge amount when evaporator temperature is at or
below the target temperature upper limit.
NOTE:
Target temperature upper limit value of evaporator can be changed using “TARGET EVAPORATOR TEMP
UPPER LIMIT SETTING” in “WORK SUPPORT” mode of CONSULT. Refer to
Evaporator Temperature Upper Limit Value"
.
Compressor Oil Circulation Control
When the engine starts, A/C amp. activates the compressor for a few seconds and circulates the compressor
oil once.
CONTROL BY ECM
Compressor Protection Control at Pressure Malfunction
When the high-pressure side value that is detected by refrigerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
• 3.12 MPa (31.82 kg/cm
2
, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.95 kg/cm
2
, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.43 kg/cm
2
, 20.3 psi) or less
Air Conditioning Cut Control
When the engine condition is high load, ECM transmit A/C relay OFF request to IPDM E/R, and stops the
compressor.
MANUAL AIR CONDITIONING SYSTEM : Door Control
INFOID:0000000010939818
SWITCH AND THEIR CONTROL FUNCTION
JMIIA2550GB
HAC-152
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
SYSTEM
*: R9M engine models
NOTE:
The sub-defroster and side ventilator door include a permanent opening and does not fully close.
Intake door
Blower motor
Air conditioner filter
Evaporator
Heater core
PTC heater*
Air mix door
Foot door
Side ventilator door
Sub defroster door
Center ventilator and defroster door
Fresh air
Recirculation air
Discharge air
Defroster
Center ventilator
Side ventilator
Rear ventilator
Front foot
Rear foot
JMIIA3570ZZ
SYSTEM
HAC-153
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
AIR DISTRIBUTION
With rear ventilator, with rear foot
MANUAL AIR CONDITIONING SYSTEM : Cooling Fan Control
INFOID:0000000010939819
DESCRIPTION
A/C amp. controls the cooling fan operation request according to the refrigerant pressure status and vehicle
speed status.
NOTE:
Switch/dial position
Door position
Mode door
Intake door
Air mix
door
Ce
nt
e
r v
e
n
til
at
o
r a
n
d
de
fr
ost
e
r
do
or
S
u
b
de
fros
te
r do
or
Si
de
v
e
n
til
at
o
r
do
or
Fo
ot doo
r
• MODE VENT switch
• MODE FOOT switch
• MODE DEF switch
• MAX DEF switch
MODE
position
VENT/DEF (V/D)
—
—
VENT
Bi-level (B/L)
ALL
FOOT
DEF/FOOT (D/F)
DEF
INTAKE switch
REC
—
—
—
—
FRE
Temperature control dial
Full cold
—
Full cold – Full hot
-
Full hot
Discharge air flow
MODE position
Air outlet/distribution
Ventilator
Foot
Defroster
Front
Rear
Front
Rear
Center
Side
V/D
39%
27%
11%
—
—
23%
VENT
47%
38%
15%
—
—
—
B/L
25%
34%
13%
18%
10%
—
ALL
21%
27%
11%
20%
10%
11%
FOOT
—
7%
4%
38%
24%
27%
D/F
—
6%
2%
30%
17%
45%
DEF
—
8%
2%
—
—
90%
HAC-154
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
SYSTEM
For an overview of the cooling fan and information about control, refer to
(MR20DD engine models) or
EC-843, "COOLING FAN CONTROL : System Description"
(R9M engine models).
CONTROL OUTLINE
• A/C amp. receives the refrigerant pressure sensor signal from ECM via CAN communication, and the vehi-
cle speed signal from the combination meter via CAN communication.
• A/C amp. sets one of the optionally determined stages according to the received refrigerant pressure sensor
signal and vehicle speed signal.
NOTE:
For the rules that prescribe the predetermined stages, refer to the following figures.
• Vehicle speed stages
Vehicle speed [Km/h (MPH)]
-
: 12 (7.5)
-
: 20 (12)
-
: 72 (45)
-
: 80 (50)
• Refrigerant pressure stages
Refrigerant pressure [MPa (bar, kg/cm
2
, psi)]
-
: 0.7 (7, 7.14, 102)
-
: 1.0 (10, 10.2, 145)
-
: 1.28 (12.8, 13.1, 186)
-
: 1.58 (15.8, 16.1, 229)
-
: 1.88 (18.8, 19.2, 273)
-
: 2.08 (20.8, 21.2, 302)
• The requested cooling fan operation strength (0%, 40%, 100%) is determined as shown in the following
table according to the combination of these two stages, and the request signal is transmitted to ECM via
CAN communication.
Cooling fan operation strength
Unit: %
MANUAL AIR CONDITIONING SYSTEM : Door Motor Starting Position Reset Control
INFOID:0000000010939820
• Step motors are used for the mode door motor air mix door motor, and intake door motor.
• Because the step motors do not have position detection mechanisms, there may be a deviation between the
door position recognized by A/C amp. and the actual door position.
Therefore, A/C amp. performs motor zero position reset for aligning its recognized door position with the
actual door position.
• The reset signal is transmitted from A/C amp. to the air mix door motor, mode door motor, and intake door
motor, which then perform zero position reset.
• After any of the following conditions is met, A/C amp. performs motor zero position reset when the ignition
switch is next turned ON.
JMIIA3568GB
JMIIA3569GB
—
Refrigerant pressure stages
1
2
3
4
Vehicle speed stag-
es
1
40
40
100
100
2
40
40
100
100
3
0
0
0
100
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