Nissan Murano Z51. Manual - part 876

 

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Nissan Murano Z51. Manual - part 876

 

 

MAGNET CLUTCH CONTROL SYSTEM

HAC-159

< SYSTEM DESCRIPTION >

[WITH 7 INCH DISPLAY]

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MAGNET CLUTCH CONTROL SYSTEM

System Diagram

INFOID:0000000005514696

System Description

INFOID:0000000005514697

The A/C auto amp. controls compressor operation by ambient temperature, intake air temperature and signal
from ECM.

SYSTEM OPERATION

When the A/C switch, the AUTO switch, or the DEF switch is pressed, or when shifting mode position D/F, A/C
auto amp. transmit the A/C switch signal and blower fan motor switch signal to the ECM, via CAN communica-
tion.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If the ECM judges that the compressor can be turned ON, it sends A/C com-
pressor request signal to the IPDM E/R, via CAN communication.
Upon receipt of A/C compressor request signal from the ECM, the IPDM E/R turns the A/C relay ON to oper-
ate the compressor.
When sending A/C compressor request signal to the IPDM E/R via CAN communication line, the ECM simul-
taneously sends A/C compressor feedback signal to A/C auto amp. via CAN communication line.
The ECM sends A/C compressor feedback signal to A/C auto amp., then, uses input A/C compressor feed-
back signal to control air inlet.

Compressor Protection Control

The ECM makes the A/C relay turn OFF and stops the compressor when pressure on the high-pressure side
detected by the refrigerant pressure sensor is over approximately 3,119 kPa (31.8 kg/cm

2

, 452 psi), or below

approximately 118 kPa (1.2 kg/cm

2

, 17 psi).

Low Temperature Protection Control

Turn the A/C relay to OFF and stop the compressor by the signal from the A/C auto amp according to the
evaporator passing air temperature detected by the intake sensor and the ambient temperature detected by
the ambient sensor. 

JSIIA1548GB

HAC-160

< SYSTEM DESCRIPTION >

[WITH 7 INCH DISPLAY]

CAN COMMUNICATION SYSTEM

CAN COMMUNICATION SYSTEM

System Description

INFOID:0000000005514698

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

LAN-27, "CAN System Specification Chart"

.

DIAGNOSIS SYSTEM (HVAC)

HAC-161

< SYSTEM DESCRIPTION >

[WITH 7 INCH DISPLAY]

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DIAGNOSIS SYSTEM (HVAC)

CONSULT-III Function

INFOID:0000000005514699

CONSULT-III can display each diagnosis item using the diagnosis test modes shown as per the following.

CONSULT-III application items

SELF DIAGNOSTIC RESULT

Refer to 

HAC-226, "DTC Index"

.

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.

Work Support

Changes the setting for each system function.
• Temperature setting trimmer
• Inlet port memory function (FRE)
• Inlet port memory function (REC)
• Foot position setting trimmer

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)

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 

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 sen-
sor 100

°

C (212

°

F) or more

B2578

IN CAR SEN SHORT

Detected temperature at in-vehicle sen-
sor 

44

°

C (

47

°

F) or less

• 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 SEN OPEN

Detected temperature at in-vehicle sen-
sor 100

°

C (212

°

F) or more

B2581

EVAP TEMP SEN SHORT

Detected temperature at intake sensor 

33

°

C (

27

°

F) or less

• 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 
69

°

C (156

°

F) or more

B2630

*

SUNLOAD SEN SHORT

Detected calorie at sunload sensor 64.7 

w/m

2

 (56 kcal/m

2

·h) or less

• 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 

2832 w/m

2

 (2436 kcal/m

2

·h) or more

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-162

< SYSTEM DESCRIPTION >

[WITH 7 INCH 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 indicates 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

B2661

UPPER VENT DOOR OPEN POSI 
FAIL

When the malfunctioning upper ventila-
tor door position is detected at open po-
sition.

• Upper ventilator door motor
• A/C auto amp.
• Harness and connector

(CAN communication line is open 
or shorted)
(Upper ventilator door motor is 
open or shorted)

B2662

UPPER VENT DOOR MID POSI FAIL

When the malfunctioning upper ventila-
tor door position is detected at middle 
position.

B2663

UPPER VENT DOOR SHUT POSI 
FAIL

When the malfunctioning upper ventila-
tor door position is detected at shut po-
sition.

DTC

Items

 (CONSULT-III 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 

 

 

 

 

 

 

 

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