Nissan Maxima. Instruction — part 713
HAC-28
< SYSTEM DESCRIPTION >
[WITH COLOR DISPLAY]
DIAGNOSIS SYSTEM (HVAC)
ACTIVE TEST
HVAC TEST
NOTE:
Perform the inspection of each output device after starting the engine because the compressor is 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%
Compressor (Magnet
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-6, "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-7, "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-7, "Inlet Port Mem-
ory 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.
DIAGNOSIS SYSTEM (HVAC)
HAC-29
< SYSTEM DESCRIPTION >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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.
HAC-30
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
U1000 CAN COMM CIRCUIT
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000010050964
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 a 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 two
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.
CAN Communication Signal Chart. Refer to
LAN-14, "How to Use CAN Communication Signal Chart"
.
DTC Logic
INFOID:0000000010050965
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000010050966
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
1. Turn ignition switch ON and wait for 2 or more seconds.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
Is “CAN COMM CIRCUIT” displayed?
YES
>> Perform trouble diagnosis for the CAN communication system. Refer to
.
NO
>> Perform the intermittent malfunction diagnosis. Refer to
GI-41, "Intermittent Incident"
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)
HAC-31
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000010050967
Initial diagnosis of A/C auto amp.
DTC Logic
INFOID:0000000010050968
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000010050969
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
Is DTC No.“U1010” displayed?
YES
>> Replace A/C auto amp. Refer to
HAC-100, "Removal and Installation"
.
NO
>> Inspection End.
DTC
Items
(CONSULT screen terms)
Diagnostic item is detected when...
Possible cause
U1010
CONTROL UNIT (CAN)
When detecting error during the initial diag-
nosis of CAN controller of A/C auto amp.
A/C auto amp.
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