Nissan Teana J32. Manual — part 668
DIAGNOSIS SYSTEM (HVAC)
HAC-41
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of WORK SUPPORT may be cancelled.
FRE MEMORY SET
• 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-11, "Inlet Port Mem-
ory Function (FRE)"
REC MEMORY SET
• 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.
HAC-11, "Inlet Port Mem-
ory Function (REC)"
Work item
Description
Reference
HAC-42
< COMPONENT DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000003846322
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-13, "How to Use CAN Communication Signal Chart"
.
DTC Logic
INFOID:0000000003846323
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000003846324
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
1.
Turn ignition switch ON and wait for 2 or more seconds.
2.
Using CONSULT-III, 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-35, "Intermittent Incident"
DTC
Items
(CONSULT-III 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-43
< COMPONENT DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000003846325
Initial diagnosis of A/C auto amp.
DTC Logic
INFOID:0000000003846326
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000003846327
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
Using CONSULT-III, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
Is DTC “U1010” displayed?
YES
>> Replace A/C auto amp.
NO
>> INSPECTION END.
DTC
Items
(CONSULT-III 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.
HAC-44
< COMPONENT DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
B257B, B257C AMBIENT SENSOR
B257B, B257C AMBIENT SENSOR
Description
INFOID:0000000003846328
COMPONENT DESCRIPTION
Ambient Sensor
• The ambient sensor (1) is installed behind left side of front bumper.
• It detects ambient temperature and converts it into a resistance
value which is then input into the A/C auto amp.
Ambient Sensor Circuit
AMBIENT TEMPERATURE INPUT PROCESS
The A/C auto amp. equips a processing circuit for the ambient sensor input. However, when the temperature
detected by the ambient sensor increases quickly, the processing circuit retards the A/C auto amp. function. It
only allows the A/C auto amp. to recognize an ambient temperature increase of 0.33
°
C (0.6
°
F) per 100 sec-
onds.
As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient tem-
perature has not changed, the temperature detected by the ambient sensor increases. This is because the
heat from the engine compartment can radiate to the front bumper area, the location of the ambient sensor.
DTC Logic
INFOID:0000000003846329
DTC DETECTION LOGIC
NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to
.
• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [
−
44
°
C (
−
47
°
F)] and
adjusts the temperature control warmer.
DTC CONFIRMATION PROCEDURE
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
JPIIA0898ZZ
JPIIA0612GB
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
B257B
AMB TEMP SEN (SHORT)
Detected temperature at ambient sensor
−
44
°
C (
−
47
°
F) or less
• 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 sensor
100
°
C (212
°
F) or more
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