Qashqai J11. Heater & Air conditioning Control System

COMPONENT PARTS

HAC-17

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

A/C UNIT ASSEMBLY : Blower Motor

INFOID:0000000010432160

• Brush motor, that rotates coil while brush functions as contact

points, is adopted for blower motor.

• Rotation speed changes according to voltage from power transis-

tor.

A/C UNIT ASSEMBLY : Power Transistor

INFOID:0000000010432161

• Power transistor, that uses MOS field effect transistor, is adopted

for blower motor speed control.
NOTE:
MOS field effect transistor is a transistor for which the gate portion
is composed of a metal electrode on an oxide layer of semiconduc-
tor. Field effect transistor is controlled by voltage, while ordinary
transistor is controlled by current. Electrode of field effect transistor
is called source, drain, or gate, while electrode of ordinary transis-
tor is called emitter, collector, or base.

• Power transistor continuously controls voltage to blower motor, according to gate voltage from A/C auto

amp.

• This power transistor does not require a HI relay even when the maximum voltage is applied to blower motor

at HI status, because voltage drop is nominal.

A/C UNIT ASSEMBLY : PTC Heater

INFOID:0000000010499375

• PTC heater is installed on passenger lower side of A/C unit assembly.
• Heat element is heated and air flow temperature is increased by

power supply from PTC relay.

JMIIA3336ZZ

JMIIA0793GB

JMIIA3335ZZ

JMIIA2397ZZ

HAC-18

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

COMPRESSOR

COMPRESSOR : Magnet Clutch

INFOID:0000000010432162

DESCRIPTION

Compressor is driven by the magnet clutch which is magnetized by electric power supply.

STRUCTURE AND OPERATION

• Magnet clutch consists of pulley, clutch disc, and field coil.
- Pulley is connected with crankshaft pulley of engine via drive belt

and is always rotated while engine is running.

- Clutch disc is connected with drive shaft of compressor.
- Field coil, which becomes a strong electric magnet when electricity

is supplied, strongly pulls clutch disc and presses it to pulley.

• When A/C relay integrated in IPDM E/R turns ON, electricity is

supplied to field coil, clutch disc is presses to pulley, and engine
rotational movement is transmitted from crankshaft pulley

⇒

drive

belt

⇒

pulley

⇒

clutch disc

⇒

drive shaft. Compressor is operated.

When A/C relay turns OFF, electricity is not supplied to field coil,
and clutch disc is released from pulley. Compressor is not oper-
ated.

COMPRESSOR : ECV (Electrical Control Valve)

INFOID:0000000010432163

• ECV (Electrical Control Valve) is integrated in the compressor.

IPDM E/R receives the ECV control signal from A/C auto amp. via
CAN communication, and ECV is controlled according to the con-
trol signal transmitted from IPDM E/R.

• ECV is controlled according to the control signal transmitted from

IPDM E/R.
The control signal transmitted by IPDM E/R is controlled according
to the ECV control signal transmitted from A/C auto amp. via CAN
communication.

• ECV varies the air pressure balance in the left and right air spaces

that are divided by the swash plate in order to change the angle of
the swash plate inside the compressor.
By changing the swash plate angle, it changes the piston stroke and controls the refrigerant discharge
amount.

A/C Control

INFOID:0000000010432164

A/C control has switches and display that can set and indicate the
operation of automatic air conditioning system. A/C control transmits
setting status to A/C auto amp. via LIN communication line. A/C auto
amp. controls automatic air conditioning system.

JMIIA1767GB

JMIIA3566GB

JMIIA3334ZZ

COMPONENT PARTS

HAC-19

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

A/C Auto Amp.

INFOID:0000000010432165

A/C auto amp. controls automatic air conditioning system by input-
ting and calculating signals from each sensor and each switch. A/C
auto amp. has self-diagnosis function. Diagnosis of automatic air
conditioning system can be performed quickly.

Ambient Sensor

INFOID:0000000010503106

Ambient sensor measures ambient air temperature. The sensor
uses a thermistor which is sensitive to the change in temperature.
The electrical resistance of the thermistor decreases as temperature
increases.

In-vehicle Sensor

INFOID:0000000010432167

In-vehicle sensor measures temperature of intake air that flows
through aspirator to passenger room. The sensor uses a thermistor
which is sensitive to the change in temperature. The electrical resis-
tance of the thermistor decreases as temperature increases.

Sunload Sensor

INFOID:0000000010432168

Sunload sensor measures sunload amount. This sensor converts
sunload amount to voltage signal by photodiode and transmits it to
A/C auto amp.

Refrigerant Pressure Sensor

INFOID:0000000010432169

DESCRIPTION

JMIIA3333ZZ

JMIIA1719GB

JMIIA1720GB

JMIIA1956GB

SYSTEM

HAC-21

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

SYSTEM

AUTOMATIC AIR CONDITIONING SYSTEM

AUTOMATIC AIR CONDITIONING SYSTEM : System Description

INFOID:0000000010432170

SYSTEM DIAGRAM

DESCRIPTION

• Automatic air conditioning system is controlled by each function of A/C auto amp., ECM and IPDM E/R.
• Each operation of air conditioning system can be controlled by A/C control.

CONTROL BY A/C AUTO AMP.

•

HAC-22, "AUTOMATIC AIR CONDITIONING SYSTEM : Temperature Control"

•

HAC-23, "AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet Control"

•

HAC-23, "AUTOMATIC AIR CONDITIONING SYSTEM : Air Flow Control"

•

HAC-24, "AUTOMATIC AIR CONDITIONING SYSTEM : Air Inlet Control"

•

HAC-24, "AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"

•

HAC-25, "AUTOMATIC AIR CONDITIONING SYSTEM : Door Control"

•

HAC-29, "AUTOMATIC AIR CONDITIONING SYSTEM : Cooling Fan Control"

•

HAC-30, "AUTOMATIC AIR CONDITIONING SYSTEM : Door Motor Starting Position Reset Control"

JMIIA3567GB

HAC-22

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

• Correction for input value

Ambient temperature correction

- A/C auto amp. inputs the temperature detected by ambient sensor as the ambient temperature.
- A/C auto amp. performs the correction of the temperature detected by ambient sensor for air conditioning

control.

- A/C auto amp. selects and uses the initial value of ambient temperature data depending on the engine cool-

ant temperature when turning the ignition switch from OFF to ON. The detection temperature of the ambient
sensor is used when engine coolant temperature is low [less than approximately 56

C (133

F)]. The mem-

ory data (before the ignition switch is OFF) when the engine is warmed up [approximately 56

C (133

F) or

more].

- The correction of the ambient temperature is not performed when the detection temperature of the ambient

temperature is less than approximately

−

C (–4

F).

In-vehicle temperature correction

- A/C auto amp. inputs the temperature detected by in-vehicle sensor as the in-vehicle temperature.
- A/C auto amp. performs the correction of the temperature detected by in-vehicle sensor for air conditioning

control.

- A/C auto amp. performs the correction so that the recognition passenger room temperature changes

depending on the difference between the detected passenger room temperature and the recognition pas-
senger room temperature. If the difference is large, the changing is early. The changing becomes slow as
the difference becomes small.

Intake temperature correction

- A/C auto amp. inputs the temperature detected by intake sensor as the intake temperature (evaporator tem-

perature).

- A/C auto amp. performs the correction of the temperature detected by intake sensor for air conditioning con-

trol.

- A/C auto amp. performs the correction so that the recognition intake temperature changes depending on the

difference between the detected intake temperature and the recognition intake temperature. If the difference
is large, the changing is early. The changing becomes slow as the difference becomes small.

Sunload amount correction

- A/C auto amp. inputs the sunload amount detected by sunload sensor.
- A/C auto amp. performs the correction of the sunload amount detected by sunload sensor for air condition-

ing control.

- When the sunload amount suddenly changes, for example when entering a tunnel, perform the correction so

that the recognition sunload amount of the A/C auto amp. changes slowly.

Set temperature correction

- A/C auto amp. performs the correction to the target temperature set by the temperature control switch so as

to match the temperature felt by the passengers depending on the ambient temperature detected by ambi-
ent sensor and controls it so that the in-vehicle temperature is always the most suitable.

CONTROL BY ECM

HAC-24, "AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"

CONTROL BY IPDM E/R

HAC-24, "AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"

AUTOMATIC AIR CONDITIONING SYSTEM : Temperature Control

INFOID:0000000010432171

• When ignition switch is in the ON position, A/C auto amp. always

automatically controls temperature regardless of air conditioner
operational state.

• A/C auto amp. calculates the target air mix door opening angle

depending on set temperature, in-vehicle temperature, ambient
temperature, and sunload.

• Air mix door is controlled depending on the comparison of current

air mix door opening angle and target air mix door opening angle.

• Regardless of in-vehicle temperature, ambient temperature, and

sunload, air mix door is fixed at the fully cold position when set
temperature is 16.0

C, and at the fully hot position when set tem-

perature is 30.0

JPIIA0633GB

SYSTEM

HAC-23

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet Control

INFOID:0000000010432172

• While air outlet is in automatic control, A/C auto amp. selects the

mode door position depending on a target air mix door angle and
outlet air temperature calculated from sunload.

• If ambient temperature is excessively low, D/F is selected to pre-

vent windshield fogging when air outlet is set to FOOT.

AUTOMATIC AIR CONDITIONING SYSTEM : Air Flow Control

INFOID:0000000010432173

DESCRIPTION

• A/C auto amp. changes gate voltage of power transistor and controls air flow continuously. When air flow is

increased, voltage of blower motor gradually increases to prevent a sudden increase in air flow.

• In addition to manual control and automatic control, air flow control is compose of starting fan speed control,

low coolant temperature starting control, high in-vehicle temperature starting control, and blower speed con-
trol at door motor operation.

AUTOMATIC AIR FLOW CONTROL

• A/C auto amp. decides target air flow depending on target air mix door opening angle.
• A/C auto amp. changes voltage of blower motor and controls air flow continuously so that air flow matches to

target air flow.

• When air outlet is VENT or B/L, the minimum air flow is changed

depending on sunload.

STARTING FAN SPEED CONTROL

When blower motor is activated, A/C auto amp. gradually increases voltage of blower motor to prevent a sud-
den increase in discharge air flow. [T

1 –

= approximately 5 seconds (for Europe and Russia), approximately

7 seconds (except for Europe and Russia)]
NOTE:
Do not perform the starting air flow control when the discharge outlet
is set to DEF.

LOW COOLANT TEMPERATURE STARTING CONTROL

JMIIA0710GB

JMIIA1129GB

JMIIA1130GB

HAC-24

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

If the engine coolant temperature is 56

C (133

F) or less, to prevent

a cold discharged air flow, A/C auto amp. suspends blower motor
activation for the maximum 150 seconds depending on target air mix
door opening angle. After this, voltage of blower motor is increased
gradually, and blower motor is activated.

HIGH IN-VEHICLE TEMPERATURE STARTING CONTROL

When evaporator temperature is high [intake sensor value is 35

C (95

F) or more], to prevent a hot dis-

charged air flow, A/C auto amp. suspends blower motor activation for approximately 3 seconds so that evapo-
rator is cooled by refrigerant.

FAN SPEED CONTROL AT DOOR MOTOR OPERATION

When mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces
temporarily fan speed so that mode door moves smoothly.

AUTOMATIC AIR CONDITIONING SYSTEM : Air Inlet Control

INFOID:0000000010432174

• A/C auto amp. controls intake door motor, and change air inlet.
• While air inlet is in automatic control, A/C auto amp. selects air

inlet (fresh air intake, 20% fresh air intake, or recirculation)
depending on set temperature, in-vehicle temperature, and ambi-
ent temperature.

AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control

INFOID:0000000010432175

DESCRIPTION

• When the compressor activation condition is satisfied while blower motor is activated, A/C auto amp. trans-

mits A/C ON signal and blower fan ON signal to ECM.

• ECM judges the conditions of each sensor (Refrigerant pressure sensor signal, accelerator position signal,

etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.

• By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti-

vates the compressor. Refer to

PCS-7, "RELAY CONTROL SYSTEM : System Description"

CONTROL BY A/C AUTO AMP.

Low Temperature Protection Control

When intake sensor detects that evaporator fin temperature is

[

−

5.0

C (23.0

F)] or less, A/C auto amp. requests ECM to turn the

compressor OFF, and stops the compressor.
When the air temperature returns to

[1.0

C (33.8

F)] or more, the

compressor is activated.

Refrigerant Discharge Amount Control

JMIIA1227GB

JMIIA0711GB

JMIIA2550GB

SYSTEM

HAC-25

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

• A/C auto amp. transmits the ECV control signal via CAN communication. IPDM E/R transmits the control sig-

nal to ECV according to the received ECV control signal.

• ECV is controlled according to change in the duty ratio of the transmitted control signal.
• Except when temperature setting is full cold or outlet is DEF, A/C auto amp. controls the refrigerant dis-

charge amount according to the required cooling capacity.

• A/C auto amp. increases the refrigerant discharge amount when evaporator temperature is higher than the

target temperature upper limit, and reduces the refrigerant discharge amount when evaporator temperature
is at or below the target temperature upper limit.

NOTE:
Target temperature upper limit value of evaporator can be changed using “TARGET EVAPORATOR TEMP
UPPER LIMIT SETTING” in “WORK SUPPORT” mode of CONSULT. Refer to

HAC-78, "Setting of Target

Evaporator Temperature Upper Limit Value"

Compressor Oil Circulation Control

When the engine starts, A/C auto amp. activates the compressor for a few seconds and circulates the com-
pressor oil once.

CONTROL BY ECM

Compressor Protection Control at Pressure Malfunction

When the high-pressure side value that is detected by refrigerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
• 3.12 MPa (31.82 kg/cm

, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)

• 2.74 MPa (27.95 kg/cm

, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)

• 0.14 MPa (1.43 kg/cm

, 20.3 psi) or less

Air Conditioning Cut Control

When the engine condition is high load, ECM transmit A/C relay OFF request to IPDM E/R, and stops the
compressor.

AUTOMATIC AIR CONDITIONING SYSTEM : Door Control

INFOID:0000000010432176

SWITCH AND THEIR CONTROL FUNCTION

SYSTEM

HAC-27

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

For Europe and Russia

*: Air inlet status is displayed by indicator during activating automatic control

Switch/dial position

Door position

Mode door

Air mix door

r v

til

r a

ost

fros

r do

til

ot doo

Driver side

r si

AUTO switch

AUTO

—

• MODE VENT switch
• MODE FOOT switch
• MODE DEF switch
• MAX DEF switch

MODE
position

VENT/DEF (V/D)

VENT

Bi-level (B/L)

ALL

FOOT

DEF/FOOT (D/F)

DEF

INTAKE switch*

REC

—

FRE

Temperature control
dial (Driver side)

DUAL
switch:
OFF

Full cold

—

16.0

C – 30.0

AUTO

Full hot

Temperature control
dial (Driver side)

DUAL
switch:
ON

Full cold

—

16.0

C – 30.0

AUTO

Full hot

Temperature control
dial (Passenger side)

Full cold

—

16.0

C – 30.0

AUTO

Full hot

ON·OFF switch

OFF

—

HAC-28

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

Except for Europe and Russia

*: Air inlet status is displayed by indicator during activating automatic control

AIR DISTRIBUTION

Without rear ventilator, without rear foot

Switch/dial position

Door position

Mode door

Air mix door

r v

til

r a

ost

fros

r do

til

ot doo

Driver side

r si

AUTO switch

AUTO

—

MODE switch

DEF switch

REC switch

—

FRE switch

Temperature control
dial (Driver side)

DUAL
switch:
OFF

Full cold

18.0

—

18.5

C – 31.5

AUTO

Full hot

32.0

Temperature control
dial (Driver side)

DUAL
switch:
ON

Full cold

18.0

—

18.5

C – 31.5

AUTO

Full hot

32.0

Temperature control
dial (Passenger side)

Full cold

18.0

—

18.5

C – 31.5

AUTO

Full hot

32.0

ON·OFF switch

OFF

—

Discharge air flow

MODE position

Air outlet/distribution

Ventilator

Front foot

Defroster

Center

Side

V/D*

40%

35%

—

25%

VENT

54%

46%

—

B/L

31%

40%

29%

—

SYSTEM

HAC-29

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

*: These positions are applied only to models for Europe and Russia.

Without rear ventilator, with rear foot

With rear ventilator, with rear foot

AUTOMATIC AIR CONDITIONING SYSTEM : Cooling Fan Control

INFOID:0000000010503110

DESCRIPTION

A/C auto amp. controls the cooling fan operation request according to the refrigerant pressure status and vehi-
cle speed status.
NOTE:
For an overview of the cooling fan and information about control, refer to

ECH-33, "COOLING FAN CONTROL

: System Description"

(HR engine models),

ECM-74, "COOLING FAN CONTROL : System Description"

(MR16DDT engine models),

ECM-654, "COOLING FAN CONTROL : System Description"

(MR20DD engine

models),

ECK-34, "COOLING FAN CONTROL : System Description"

(K9K engine models) or

EC9-37,

"COOLING FAN CONTROL : System Description"

(R9M engine models).

CONTROL OUTLINE

• A/C auto amp. receives the refrigerant pressure sensor signal from ECM via CAN communication, and the

vehicle speed signal from the combination meter via CAN communication.

ALL*

21%

34%

31%

14%

FOOT

—

10%

58%

32%

D/F

—

43%

48%

DEF

—

10%

—

90%

Discharge air flow

MODE position

Air outlet/distribution

Ventilator

Front foot

Defroster

Center

Side

Discharge air flow

MODE position

Air outlet/distribution

Ventilator

Foot

Defroster

Center

Side

Front

Rear

V/D

40%

35%

—

25%

VENT

54%

46%

—

B/L

33%

40%

16%

11%

—

ALL

22%

35%

16%

11%

16%

FOOT

—

11%

32%

25%

32%

D/F

—

24%

19%

49%

DEF

—

10%

—

90%

Discharge air flow

MODE position

Air outlet/distribution

Ventilator

Foot

Defroster

Front

Rear

Front

Rear

Center

Side

V/D

39%

27%

11%

—

23%

VENT

47%

38%

15%

—

B/L

25%

34%

13%

18%

10%

—

ALL

21%

27%

11%

20%

10%

11%

FOOT

—

38%

24%

27%

D/F

—

30%

17%

45%

DEF

—

90%

HAC-30

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

• A/C auto amp. sets one of the optionally determined stages according to the received refrigerant pressure

sensor signal and vehicle speed signal.
NOTE:
For the rules that prescribe the predetermined stages, refer to the following figures.
• Vehicle speed stages

Vehicle speed [Km/h (MPH)]

: 12 (7.5)

: 20 (12)

: 72 (45)

: 80 (50)

• Refrigerant pressure stages

Refrigerant pressure [MPa (bar, kg/cm

, psi)]

: 0.7 (7, 7.14, 102)

: 1.0 (10, 10.2, 145)

: 1.28 (12.8, 13.1, 186)

: 1.58 (15.8, 16.1, 229)

: 1.88 (18.8, 19.2, 273)

: 2.08 (20.8, 21.2, 302)

• The requested cooling fan operation strength (0%, 40%, 100%%) is determined as shown in the following

table according to the combination of these two stages, and the request signal is transmitted to ECM via
CAN communication.

Cooling fan operation strength

Unit: %

AUTOMATIC AIR CONDITIONING SYSTEM : Door Motor Starting Position Reset
Control

INFOID:0000000010503109

• Step motors are used for the mode door motor air mix door motor (driver side/passenger side), and intake

door motor.

• Because the step motors do not have position detection mechanisms, there may be a deviation between the

door position recognized by A/C auto amp. and the actual door position.
Therefore, A/C auto amp. performs motor zero position reset for aligning its recognized door position with
the actual door position.

• The reset signal is transmitted from A/C auto amp. to the air mix door motor (driver side/passenger side),

mode door motor, and intake door motor, which then perform zero position reset.

• After any of the following conditions is met, A/C auto amp. performs motor zero position reset when the igni-

tion switch is next turned ON.

- The battery terminal is disconnected and then reconnected.
- The travel distance reaches 3,000 km (1846 miles). [Performed every 3,000 km (1846 miles).]
• If A/C auto amp., air mix door motor (driver side, passenger side), mode door motor, or intake door motor is

removed, it is necessary to perform motor zero position reset using CONSULT.

JMIIA3568GB

JMIIA3569GB

—

Refrigerant pressure stages

Vehicle speed stag-
es

100

SYSTEM

HAC-31

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

AUTOMATIC AIR CONDITIONING SYSTEM : Fail-safe

INFOID:0000000010502850

FAIL-SAFE FUNCTION

If a communication error exists between the A/C auto amp. and A/C control for 30 seconds or longer, air con-
ditioning is controlled under the following conditions: A/C auto amp. is controlled in the setting state before the
communication error occurs for following setting.
• Set temperature
• Air outlet
• Blower fan speed
• Air inlet
• A/C switch

PTC HEATER CONTROL SYSTEM

PTC HEATER CONTROL SYSTEM : System Description

INFOID:0000000010499351

SYSTEM DIAGRAM

DESCRIPTION

• BCM performs PTC relay ON/OFF control based on engine speed, engine coolant temperature, electrical

power cut freeze signal (permission signal, retention signal, stop signal), blower motor operation state sig-
nal, front window defogger state signal, ambient temperature signal, battery voltage, and electrical load state
(high beam request, low beam request, and others).

• When PTC relay turns ON, power supply is supplied to PTC heater. Heating element is heated and air flow

temperature is increased. Heating is available for a period of time until engine coolant temperature is
increased when engine starts cold in cold climate.

• Idle up request signal is transmitted from BCM to ECM while PTC heater operates. Idle speed is increased,

warming-up is facilitated, and battery electric power is obtained.

• Electric power supplied to PTC heating element is subject to PTC relay control conditions.

NOTE:
PTC heater operation depends on ambient temperature and battery voltage. PTC heater is ON when ambient
temperature is 8

C or less. PTC heater is OFF when ambient temperature is 12

C (53.6

F) or more. PTC

heater is ON when battery voltage is 11.5 V or more. PTC heater is OFF when battery voltage is 11 V or less.

STOP/START SYSTEM

JMIIA3582GB

PTC heater

Operation

PTC relay-1

PTC relay-2

PTC relay-3

Electric power (W)

OFF

Approx. 0

PTC heater-1

LOW

OFF

Approx. 333

PTC heater-2

MID

OFF

Approx. 666

PTC heater-3

Approx. 999

HAC-32

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

STOP/START SYSTEM : System Description

INFOID:0000000010499353

SYSTEM DIAGRAM

DESCRIPTION

• In the stop/start system, ECM performs integrated control based on the information from control units, sen-

sors and switches. For details, refer to

ECH-35, "STOP/START SYSTEM : System Description"

(HRA2DDT

engine models),

ECM-79, "STOP/START SYSTEM : System Description"

(MR16DDT engine models),

ECK-

39, "STOP/START SYSTEM : System Description"

(K9K engine models),

EC9-42, "STOP/START SYSTEM

: System Description (M/T models)"

(R9M engine M/T models) or

EC9-50, "STOP/START SYSTEM : Sys-

tem Description (CVT models)"

(R9M engine CVT models).

• A/C auto amp. transmits stop/start permit signal (permit) to ECM via CAN communication if it judges that the

comfort level in the passenger room can be maintained, even when engine stops while idling, based on each
sensor and the set temperature.

• A/C auto amp. receives operation status of stop/start system (stop/start status signal) from ECM via CAN

communication. When A/C auto amp. recognizes that stop/start system is operating based on the signal, it
changes control characteristics of air flow and inlet.

• When A/C auto amp. judges that the comfort level in the passenger room cannot be maintained while stop/

start function operates, it cancels stop/start permit signal (permit) and requests ECM to restart engine. Also,
when switch operation of A/C control (DEF switch) occurs, it also requests engine restart to ECM as well.

Stop/start Permission Condition Evaluated By A/C Auto Amp. (Before Stop/start Operation)

Before stop/start operation, when the following conditions are met, A/C auto amp. judges that stop/start sys-
tem operation is available and transmits stop/start permit signal to ECM via CAN communication.
• Outlet: Other than DEF (Enabled only when the ambient temperature is 25oC or less. When ambient tem-

perature is higher than 25

C (77

F), the outlet condition is not included in the conditions for judging that stop/

start is possible.)

• Air flow: Other than for maximum position
• Passenger room temperature: Becomes approx. 20

C (68

F) or more (when A/C switch is ON/OFF) or

approx. 30

C (86

F) or less (only when A/C switch is ON).

- When A/C switch is ON: 20

C (68

F) or more, and 30

C (86

F) or less.

- When A/C switch is OFF: 20

C (68

F) or more

JMIIA3571GB

Qashqai J11. Heater & Air conditioning Control System - part 2