Nissan Maxima. Manual — part 739
HAC-132
< SYSTEM DESCRIPTION >
[WITH MONOCHROME DISPLAY]
DIAGNOSIS SYSTEM (HVAC)
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.
U1000 CAN COMM CIRCUIT
HAC-133
< DTC/CIRCUIT DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
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A
B
HAC
N
O
P
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000010051127
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:0000000010051128
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000010051129
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
HAC-134
< DTC/CIRCUIT DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
U1010 CONTROL UNIT (CAN)
U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000010051130
Initial diagnosis of A/C auto amp.
DTC Logic
INFOID:0000000010051131
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000010051132
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-203, "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.
B257B, B257C AMBIENT SENSOR
HAC-135
< DTC/CIRCUIT DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
C
D
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A
B
HAC
N
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B257B, B257C AMBIENT SENSOR
Description
INFOID:0000000010051133
COMPONENT DESCRIPTION
Ambient Sensor
• The ambient sensor (1) is installed to the front bumper reinforce-
ment.
• 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:0000000010051134
DTC DETECTION LOGIC
NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to
or
.
• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [-30
°C (-22°F)] and
adjusts the temperature control warmer.
DTC CONFIRMATION PROCEDURE
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
ALIIA0314ZZ
JPIIA0612GB
DTC
Items
(CONSULT screen terms)
Diagnostic item is detected when...
Possible cause
B257B
AMB TEMP SEN (SHORT)
Detected temperature at ambient sensor
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 sensor
−30°C (−22°F) or less
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