Infiniti QX56 (Z62). Manual — part 795
SYSTEM SETTING
HAC-71
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONING]
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Movement Change Function
INFOID:0000000006275902
DESCRIPTION
Condition for interlocking movement of auto intake switch and A/C switch can be changed. In addition opera-
tion of the auto intake switch, which activates the automatic intake control (exhaust gas / outside odor detect-
ing mechanism), can be set to become available when the A/C switch is ON.
HOW TO SET
With CONSULT-III
Perform the “CLEAN SW SET” of HVAC work support item.
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.
Work support items
Display
Setting
CLEAN SW SET
Mode1
Initial setting
Mode2
Setting 1
Mode3
Setting 2
Mode4
Setting 3
Initial setting
When the auto intake switch is ON, the A/C switch is also turned ON in synchronization with the auto intake
switch.
Control of the auto intake switch is functional even when the A/C switch is turned OFF.
Setting 1
When the auto intake switch is ON, the A/C switch is not turned ON in synchronization with the auto intake
switch.
Control of the auto intake switch is functional even when the A/C switch is turned OFF.
Setting 2
When the auto intake switch is ON, the A/C switch is also turned ON in synchronization with the auto intake
switch.
When the A/C switch is turned OFF, the auto intake switch is turned OFF in synchronization with the A/C
switch.
Setting 3
Auto intake switch can be turned ON only when A/C switch is ON.
When the A/C switch is turned OFF, the auto intake switch is turned OFF in synchronization with the A/C
switch.
HAC-72
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
U1000 CAN COMM CIRCUIT
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000006275903
CAN (Controller Area Network) is a serial communication system for real time application. It is an on-vehicle
multiplex communication system with high data communication speed and excellent error detection ability.
Many electronic control units are equipped onto vehicles, and each control unit shares information and links
with other control units during operation (not independent). In CAN communication, control units are con-
nected 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-28, "CAN COMMUNICATION SYSTEM : CAN Communica-
DTC Logic
INFOID:0000000006275904
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM SELF-DIAGNOSIS
With CONSULT-III
1.
Turn ignition switch ON and wait for 2 seconds or more.
2.
Select “Self Diagnostic Result” mode of “HVAC” using CONSULT-.III
3.
Check DTC.
Is DTC detected?
YES
>> Refer to
NO
>> Refer to
GI-40, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000006275905
1.
CHECK CAN COMMUNICATION SYSTEM
Check CAN communication system. Refer to
LAN-18, "Trouble Diagnosis Flow Chart"
>> INSPECTION END
DTC
Items
(CONSULT-III screen terms)
DTC detection condition
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-73
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
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U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000006275906
Initial diagnosis of A/C auto amp.
DTC Logic
INFOID:0000000006275907
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM SELF-DIAGNOSIS
With CONSULT-III
1.
Turn ignition switch ON.
2.
Select “Self Diagnostic Result” mode of “HVAC” using CONSULT-.III
3.
Check DTC.
Is DTC detected?
YES
>> Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006275908
1.
REPLACE A/C AUTO AMP.
Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
>> INSPECTION END
DTC
Items
(CONSULT-III screen terms)
DTC detection condition
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-74
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
B2578, B2579 FRONT IN-VEHICLE SENSOR
B2578, B2579 FRONT IN-VEHICLE SENSOR
DTC Logic
INFOID:0000000006275909
DTC DETECTION LOGIC
NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1.
Turn ignition switch ON.
2.
Select “Self Diagnostic Result” mode of “HVAC” using CONSULT-III.
3.
Check DTC.
Is DTC detected?
YES
>> Refer to
HAC-106, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006275910
1.
CHECK FRONT IN-VEHICLE SENSOR POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect front in-vehicle sensor connector.
3.
Turn ignition switch ON.
4.
Check voltage between front in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK FRONT IN-VEHCLE SENSOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between front in-vehicle sensor harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
DTC
Items
(CONSULT-III screen terms)
DTC detection condition
Possible cause
B2578
IN-VEHICLE SENSOR
The front in-vehicle sensor recognition temper-
ature is too high.
• Front in-vehicle sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B2579
The front in-vehicle sensor recognition temper-
ature is too low.
+
−
Voltage
(Approx.)
Front in-vehicle sensor
Connector
Terminal
M73
1
Ground
5 V
Front in-vehicle sensor
—
Continuity
Connector
Terminal
M73
2
Ground
Existed
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