Nissan Maxima. Instruction — part 738
HAC-128
< SYSTEM DESCRIPTION >
[WITH MONOCHROME DISPLAY]
CAN COMMUNICATION SYSTEM
CAN COMMUNICATION SYSTEM
System Description
INFOID:0000000010051125
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
DIAGNOSIS SYSTEM (HVAC)
HAC-129
< SYSTEM DESCRIPTION >
[WITH MONOCHROME DISPLAY]
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DIAGNOSIS SYSTEM (HVAC)
CONSULT Function
INFOID:0000000010051126
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 results 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)
• 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
HAC-130
< SYSTEM DESCRIPTION >
[WITH MONOCHROME DISPLAY]
DIAGNOSIS SYSTEM (HVAC)
*: 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
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
DIAGNOSIS SYSTEM (HVAC)
HAC-131
< SYSTEM DESCRIPTION >
[WITH MONOCHROME DISPLAY]
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HAC
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ACTIVE TEST
HVAC TEST
NOTE:
Perform the inspection of each output device after starting the engine, because the A/C compressor has been operating.
WORK SUPPORT
NOTE:
ENG COOL TEMP
[
°C] Water temperature signal value received from ECM via CAN communication
VEHICLE SPEED
[mph
(km/h)]
Vehicle speed signal value received from meter via CAN communication
Monitor item [Unit]
Description
Test item
Description
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.
Test item
MODE 1
MODE 2
MODE 3
MODE 4
MODE 5
MODE 6
Mode door position
VENT1
B/L1
B/L2
FOOT
D/F
DEF
Intake door position
REC
REC
20%FRE
FRE
FRE
FRE
Air mix door position
(driver & passenger
side)
FULL COLD
FULL COLD
FULL HOT
FULL HOT
FULL HOT
FULL HOT
Blower motor duty ratio
37%
91%
65%
65%
65%
91%
A/C compressor (Mag-
net clutch)
ON
ON
OFF
OFF
ON
ON
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-109, "Temperature
Setting Trimmer"
BLOW SET
(Blow setting to DEF in FOOT mode)
In the FOOT mode, the air blowing to the DEF can change ON/
OFF.
HAC-110, "Foot Position
Setting Trimmer"
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), “Perform the memory” or
“Do not perform the memory” of the FRE switch ON (fresh air in-
take) condition can be selected.
• If “Perform the memory” was set, the FRE switch will be ON
(fresh air intake) when turning the ignition switch to the ON posi-
tion again.
• If “Do not perform the memory” was set, the air inlets will be con-
trolled automatically when turning the ignition switch to the ON
position again.
HAC-110, "Inlet Port
Memory Function (FRE)"
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), “Perform the memory” or “Do
not perform the memory” of the REC switch ON (recirculation)
condition can be selected.
• If “Perform the memory” was set, the REC switch will be ON (re-
circulation) when turning the ignition switch to the ON position
again.
• If “Do not perform the memory” was set, the air inlets will be con-
trolled automatically when turning the ignition switch to the ON
position again.
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