Content .. 694 695 696 697 ..

Nissan Teana J32. Manual - part 696

BLOWER MOTOR CONTROL SYSTEM

HAC-153

< FUNCTION DIAGNOSIS >

[WITH 7 INCH DISPLAY]

HAC

Starting Air Flow Control

• When starting the automatic control of air flow, the system gradually increases the duty ratio of the blower

motor drive signal to prevent too much air from blowing.

• The time period from when the air flow changes from LO to HI is approximately 8 seconds.
• It becomes the starting air flow control at low coolant temperature according to the calculation result of the A/

C auto amp. and engine coolant temperature [approximately 56

C (133

F) or less] during the automatic air

flow control.

• Do not perform the starting air flow control when the air discharge outlet is set to DEF.

Starting Fan Speed Control

Start up from COLD SOAK Condition (Automatic mode)
In cold start up condition where the engine coolant temperature is below 56

C (133

F), the blower does not

operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient temperature and engine coolant temperature.
In the most extreme case (very low ambient temperature) the blower start delay is 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56

C (133

F), and then the blower speed increases to the objective speed.

Start up from usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the AUTO switch is pressed. The blower speed rises gradu-
ally to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).

HAC-154

< FUNCTION DIAGNOSIS >

[WITH 7 INCH DISPLAY]

MAGNET CLUTCH CONTROL SYSTEM

MAGNET CLUTCH CONTROL SYSTEM

System Diagram

INFOID:0000000003884729

System Description

INFOID:0000000003884730

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, A/C auto amp. transmit the A/C switch
signal and blower fan motor switch signal to the ECM, via CAN communication.
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 (31.19bar, 31.8 kg/cm

, 452 psi),

or below approximately 118 kPa (1.18bar, 1.2 kg/cm

, 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.

JPIIA0504GB

CAN COMMUNICATION SYSTEM

HAC-155

< FUNCTION DIAGNOSIS >

[WITH 7 INCH DISPLAY]

HAC

CAN COMMUNICATION SYSTEM

System Description

INFOID:0000000003884731

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-22, "CAN System Specification Chart"

HAC-156

< FUNCTION DIAGNOSIS >

[WITH 7 INCH DISPLAY]

DIAGNOSIS SYSTEM (HVAC)

DIAGNOSIS SYSTEM (HVAC)

WITHOUT INTELLIGENT AIR CONDITIONER SYSTEM

WITHOUT INTELLIGENT AIR CONDITIONER SYSTEM : CONSULT-III Function

INFOID:0000000003884732

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-212, "WITHOUT INTELLIGENT AIR CONDITIONER SYSTEM : 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

−

C (

−

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 SENSOR (OUT OF RANGE
[LOW])

Detected temperature at in-vehicle sen-
sor

−

C (

−

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 SENSOR (OUT OF RANGE
[HI])

Detected temperature at in-vehicle sen-
sor 100

C (212

F) or more

B2581

EVAP TEMP SEN (SHORT)

Detected temperature at intake sensor

−

C (

−

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

(30 kcal/m

·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

(1304 kcal/m

·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

Content .. 694 695 696 697 ..