Nissan Sentra. Manual — part 544
HAC-24
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (A/C AUTO AMP.)
DIAGNOSIS SYSTEM (A/C AUTO AMP.)
Description
INFOID:0000000009757629
Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings
using diagnosis function of each control unit.
CONSULT Function (HVAC)
INFOID:0000000009757630
CONSULT can display each diagnosis item using the diagnosis test modes as shown.
CONSULT application items
SELF-DIAGNOSTIC RESULT
.
Display Item List
ECU
Diagnostic item
(CONSULT)
A/C auto amp.
HVAC
Self Diagnostic Result
Data Monitor
Active Test
Work support
BCM
BCM-AIR CONDITIONER
Self Diagnostic Result
Data Monitor
ECM
ENGINE
Self Diagnostic Result
Data Monitor
IPDM E/R
IPDM E/R
Self Diagnostic Result
Data Monitor
Auto active test
Diagnosis mode
Description
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.
Work support
Changes the setting for each system function.
Active Test
The signals used to activate each device are forcibly supplied from A/C auto amp.
ECU Identification
Displays the A/C auto amp. number.
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
DIAGNOSIS SYSTEM (A/C AUTO AMP.)
HAC-25
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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 reports an error even though the sunload sensor is functioning normally.
DATA MONITOR
Display item list
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)
• 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)
B27A2
DR AIRMIX ACTR
Short or open circuit of air mix door mo-
tor drive signal terminal 1.
• Air mix door motor LH
• A/C auto amp.
• Harness and connector
(Air mix door motor is open or
shorted)
B27A3
Short or open circuit of air mix door mo-
tor drive signal terminal 2.
B27A4
Short or open circuit of air mix door mo-
tor drive signal terminal 3.
B27A5
Short or open circuit of air mix door mo-
tor drive signal terminal 4.
B27AA
AS AIRMIX ACTR
Short or open circuit of air mix door mo-
tor drive signal terminal 1.
• Air mix door motor RH
• A/C auto amp.
• Harness and connector
(Air mix door motor is open or
shorted)
B27AB
Short or open circuit of air mix door mo-
tor drive signal terminal 2.
B27AC
Short or open circuit of air mix door mo-
tor drive signal terminal 3.
B27AD
Short or open circuit of air mix door mo-
tor drive signal terminal 4.
B27A0
INTAKE ACTR
PBR opening angle of intake door mo-
tor is 50% or more. (PBR feedback sig-
nal voltage of intake door motor is 2.5V
or more)
• Intake door motor
• A/C auto amp.
• Harness and connector
(Intake door motor is open or
shorted)
B27A1
PBR opening angle of intake door mo-
tor is 30% or less. (PBR feedback sig-
nal voltage of intake door motor is 1.5V
or less)
B27A6
MODE DOOR ACTR
Short or open circuit of air mix door mo-
tor drive signal terminal 1.
• Mode door motor
• A/C auto amp.
• Harness and connector
(Mode door motor is open or
shorted)
B27A7
Short or open circuit of air mix door mo-
tor drive signal terminal 2.
B27A8
Short or open circuit of air mix door mo-
tor drive signal terminal 3.
B27A9
Short or open circuit of air mix door mo-
tor drive signal terminal 4.
DTC
Items
(CONSULT screen terms)
Diagnostic item is detected when...
Possible cause
Monitor item [Unit]
Description
AMB TEMP SEN
[
°C]
Ambient sensor value converted from ambient sensor signal received from ambient
sensor
IN-VEH TEMP
[
°]
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
HAC-26
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (A/C AUTO AMP.)
WORK SUPPORT
NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of
WORK SUPPORT may be cancelled.
ACTIVE TEST
HVAC TEST
SUNLOAD SEN
[w/m
2
]
Sunload sensor value converted from sunload sensor signal received from sunload
sensor
AMB SEN CAL
[
°] 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.
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
FAN DUTY
[%] Duty ratio of blower motor judged by A/C auto amp.
XM
Target discharge air temperature judged by A/C auto amp. according to the tempera-
ture setting and the value from each sensor
ENG COOL TEMP
[
°C] Water temperature signal value received from ECM via CAN communication
VEHICLE SPEED
[km/h
(mph)]
Vehicle speed signal value received from meter via CAN communication
Monitor item [Unit]
Description
Work item
Description
Reference
TEMP SET CORRECT
(Setting of difference between tem-
perature setting and control tempera-
ture)
If the temperature felt by the customer is different than the airflow
temperature controlled by the temperature setting, the auto ampli-
fier control temperature can be adjusted to compensate for the
temperature setting.
HAC-55, "Temperature
Setting Trimmer"
REC MEMORY SET
(REC memory function setting)
• If the ignition switch is turned to the OFF position while the REC
switch is set to ON (recirculation), “With” or “Without” of the REC
switch ON (recirculation) condition can be selected.
• If “With” was set, the REC switch will be ON (recirculation) when
turning the ignition switch to the ON position again.
• If “Without” was set, the air inlets will be controlled automatically
when turning the ignition switch to the ON position again.
HAC-56, "Inlet Port
Memory Function (REC)"
FRE MEMORY SET
(FRE memory function setting)
• If the ignition switch is turned to the OFF position while the FRE
switch is set to ON (fresh air intake), “With” or “Without” of the
FRE switch ON (fresh air intake) condition can be selected.
• If “With” was set, the FRE switch will be ON (fresh air intake)
when turning the ignition switch to the ON position again.
• If “Without” was set, the air inlets will be controlled automatically
when turning the ignition switch to the ON position again.
HAC-55, "Inlet Port
Memory Function (FRE)"
Door Motor Starting Position Reset
Starting position reset of air mix door motor and mode door motor
can be performed.
TARGET EVAPORATOR TEMP UP-
PER LIMIT SETTING
Set the target evaporator upper temperature limit.
HAC-56, "Target Evapo-
rator Temp Upper Limit"
Test item
Description
ALL SEG
All switch indicator and display indication are turned ON.
HVAC TEST
The operation check of A/C system can be performed by selecting the mode. Refer to the fol-
lowing table for the conditions of each mode.
DIAGNOSIS SYSTEM (A/C AUTO AMP.)
HAC-27
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
NOTE:
Perform the inspection of each output device after starting the engine, because the A/C compressor has been operating.
Test item
MODE 1
MODE 2
MODE 3
MODE 4
MODE 5
MODE 6
MODE 7
Mode door position
VENT
VENT
B/L
B/L
D/F1
D/F2
DEF
Intake door position
REC
REC
REC
20%FRE
FRE
FRE
FRE
Air mix door position
(driver & passenger
side)
FULL COLD
FULL COLD
FULL COLD
50%
50%
FULL HOT
FULL HOT
Blower motor (Applied
voltage)
30%
30%
60%
HI
HI
60%
HI
A/C compressor (Mag-
net clutch)
ON
ON
ON
ON
OFF
OFF
ON
ECV duty
80%
80%
40%
40%
0%
0%
90%
Blower fan ON signal
ON
ON
ON
ON
OFF
OFF
ON
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