Nissan Maxima. Manual — part 712
HAC-24
< SYSTEM DESCRIPTION >
[WITH COLOR DISPLAY]
MAGNET CLUTCH CONTROL SYSTEM
MAGNET CLUTCH CONTROL SYSTEM
System Diagram
INFOID:0000000010050960
System Description
INFOID:0000000010050961
The A/C auto amp. controls compressor operation by ambient temperature, intake air temperature and signal
from ECM.
SYSTEM OPERATION
When the A/C switch, the AUTO switch, or the DEF switch is pressed, or when shifting mode position to D/F,
the A/C auto amp. transmits the A/C switch signal and blower fan motor switch signal to the ECM, via CAN
communication.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If the ECM judges that the compressor can be turned ON, it sends A/C com-
pressor request signal to the IPDM E/R, via CAN communication.
Upon receipt of A/C compressor request signal from the ECM, the IPDM E/R turns the A/C relay ON to oper-
ate the compressor.
When sending A/C compressor request signal to the IPDM E/R via CAN communication line, the ECM simul-
taneously sends A/C compressor feedback signal to A/C auto amp. via CAN communication line.
The ECM sends A/C compressor feedback signal to A/C auto amp., then, uses input A/C compressor feed-
back signal to control air inlet.
Compressor Protection Control
The ECM makes the A/C relay turn OFF and stops the compressor when pressure on the high-pressure side,
detected by the refrigerant pressure sensor, is over approximately 3,119 kPa (31.8 kg/cm
2
, 452 psi), or below
approximately 118 kPa (1.2 kg/cm
2
, 17 psi).
Low Temperature Protection Control
Turn the A/C relay to OFF and stop the A/C compressor by the signal from the A/C auto amp., according to the
evaporator passing air temperature detected by the intake sensor and the ambient temperature detected by
the ambient sensor.
AWIIA1380GB
CAN COMMUNICATION SYSTEM
HAC-25
< SYSTEM DESCRIPTION >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
CAN COMMUNICATION SYSTEM
System Description
INFOID:0000000010050962
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 each 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. For details, refer to
HAC-26
< SYSTEM DESCRIPTION >
[WITH COLOR DISPLAY]
DIAGNOSIS SYSTEM (HVAC)
DIAGNOSIS SYSTEM (HVAC)
CONSULT Function
INFOID:0000000010050963
CONSULT can display each diagnosis item using the diagnosis test modes as shown.
CONSULT application items
SELF DIAGNOSTIC RESULT
.
Display Item List
Diagnosis mode
Description
ECU Identification
Displays the A/C auto amp. number.
Self Diagnostic Result
Displays the diagnosis results judged by A/C auto amp.
Data Monitor
Displays A/C auto amp. input/output data in real time.
Active Test
The signals used to activate each device are forcibly supplied from A/C auto amp.
CAN diag support monitor
The result of transmit/receive diagnosis of CAN communication can be read.
Work Support
Changes the setting for each system function.
DTC
Items
(CONSULT screen terms)
Diagnostic item is detected when...
Possible cause
U1000
CAN COMM CIRCUIT
When A/C auto amp. is not transmitting
or receiving CAN communication signal
for 2 or more seconds.
CAN communication system
U1010
CONTROL UNIT (CAN)
When detecting error during the initial
diagnosis of CAN controller of A/C auto
amp.
A/C auto amp.
B257B
AMB TEMP SEN (SHORT)
Detected temperature at ambient sen-
sor
−55°C (131°F) or more
• Ambient sensor
• A/C auto amp.
• Harness and connector
(Ambient sensor circuit is open,
or there is a short in the circuit)
B257C
AMB TEMP SEN (OPEN)
Detected temperature at ambient sen-
sor -30
°C (-22°F) or less
B2578
IN-CAR SENSOR (OUT OF RANGE
[LOW])
Detected temperature at in-vehicle sen-
sor 55
°C (131°F) or more
• In-vehicle sensor
• A/C auto amp.
• Harness and connector
(In-vehicle sensor circuit is open,
or there is a short in the circuit)
B2579
IN-CAR SENSOR (OUT OF RANGE
[HI])
Detected temperature at in-vehicle sen-
sor -30
°C (-22°F) or less
B2581
EVAP TEMP SEN (SHORT)
Detected temperature at intake sensor
55
°C (131°F) or more
• Intake sensor
• A/C auto amp.
• Harness and connector
(Intake sensor circuit is open, or
there is a short in the circuit)
B2582
EVAP TEMP SEN (OPEN)
Detected temperature at intake sensor -
-30
°C (-22°F) or less
B2630
*
SUNLOAD SEN (SHORT)
Detected calorie at sunload sensor
1395 w/m
2
(1200 kcal/m
2
·h) or more
• Sunload sensor
• A/C auto amp.
• Harness and connector
(Sunload sensor circuit is open,
or there is a short in the circuit)
B2631
*
SUNLOAD SEN (OPEN)
Detected calorie at sunload sensor 0 w/
m
2
(0 kcal/m
2
·h)
B2632
DR AIRMIX ACTR (SHORT)
Air mix door PBR (driver side) position
5% or less
• Air mix door motor (driver side)
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Air mix door motor is open or
shorted)
B2633
DR AIRMIX ACTR (OPEN)
Air mix door PBR (driver side) position
95% or more
DIAGNOSIS SYSTEM (HVAC)
HAC-27
< SYSTEM DESCRIPTION >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
*: Perform self-diagnosis under sunshine. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise self-diag-
nosis indicates a DTC even though the sunload sensor is functioning normally.
DATA MONITOR
Display item list
B2634
PASS AIRMIX ACTR (SHORT)
Air mix door PBR (passenger side) po-
sition 5% or less
• Air mix door motor (passenger
side)
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Air mix door motor is open or
shorted)
B2635
PASS AIRMIX ACTR (OPEN)
Air mix door PBR (passenger side) po-
sition 95% or more
B2636
DR VENT DOOR FAIL
When the malfunctioning door position
is detected at VENT position
• Mode door motor
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Mode door motor is open or
shorted)
B2637
DR B/L DOOR FAIL
When the malfunctioning door position
is detected at B/L position
B2638
DR D/F1 DOOR FAIL
When the malfunctioning door position
is detected at FOOT position
B2639
DR DEF DOOR FAIL
When the malfunctioning door position
is detected at DEF position
B263D
FRE DOOR FAIL
When the malfunctioning intake door
position is detected at FRE position
• Intake door motor
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Intake door motor is open or
shorted)
B263E
20P FRE DOOR FAIL
When the malfunctioning intake door
position is detected at 20%FRE posi-
tion
B263F
REC DOOR FAIL
When the malfunctioning intake door
position is detected at REC position
B2654
D/F2 DOOR FAIL
When the malfunctioning door position
is detected at D/F position
• Mode door motor
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Mode door motor is open or
shorted)
B2655
B/L2 DOOR FAIL
When the malfunctioning door position
is detected at B/L2 position
DTC
Items
(CONSULT screen terms)
Diagnostic item is detected when...
Possible cause
Monitor item [Unit]
Description
COMP REQ SIG
[On/Off] Displays A/C switch ON/OFF status transmitted to other units via CAN communication
FAN REQ SIG
[On/Off]
Displays blower switch ON/OFF status transmitted to other units via CAN communica-
tion
AMB TEMP SEN
[
°C]
Ambient sensor value converted from ambient sensor signal received from ambient
sensor
IN-VEH TEMP
[
°C]
In-vehicle sensor value converted from in-vehicle sensor signal received from in-vehi-
cle sensor
INT TEMP SEN
[
°C] Intake sensor value converted from intake sensor signal received from intake sensor
SUNLOAD SEN
[w/m
2
]
Sunload sensor value converted from sunload sensor signal received from sunload
sensor
AMB SEN CAL
[
°C] Ambient sensor value calculated by A/C auto amp.
IN-VEH CAL
[
°C] In-vehicle sensor value calculated by A/C auto amp.
INT TEMP CAL
[
°C] Intake sensor value calculated by A/C auto amp.
SUNL SEN CAL
[w/m
2
] Sunload sensor value calculated by A/C auto amp.
FAN DUTY
[%] Duty ratio of blower motor judged by A/C auto amp.
XM
[
°C]
Target discharge air temperature judged by A/C auto amp. according to the tempera-
ture setting and the value from each sensor
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст