Nissan Qashqai J11. Manual - part 184

ECH-34

< SYSTEM DESCRIPTION >

[HRA2DDT]

SYSTEM

Input/

Output

Transmits/Receives component

Signal name

Description

Input

Crankshaft position sensor

Crankshaft position sensor signal

Detects an engine speed.

Engine coolant temperature 
sensor

Engine coolant temperature sensor signal

Detects an engine coolant tem-
perature.

Clutch pedal position switch

Clutch pedal position switch signal

Detects the clutch pedal is de-
pressed (not released).

Clutch pedal interlock switch

Clutch pedal interlock switch signal

Detects the clutch pedal is de-
pressed (fully depressed).

Neutral position switch

Neutral position switch signal

Detects the neutral position.

Atmospheric pressure sensor
(integrated in ECM)

Atmospheric pressure sensor signal

Detects an atmospheric pres-
sure.

IPDM E/R

CAN communica-
tion

Stop/Start permit signal

Detects IPDM E/R is ready to op-
erate the stop/start system. For 
details, refer to 

CHG-8, "ENER-

GY MANAGEMENT SYSTEM : 
System Description"

.

Battery current signal

Detects battery current.

Neutral position switch signal

Detects the neutral position.

Hood switch signal

Detects engine hood status.

Battery current sensor malfunc-
tion signal

Detects the battery current sen-
sor is normal.

BCM

CAN communica-
tion

Ignition switch status signal

Detects ignition switch status.

Door switch signal

Detects the status of driver side 
door.

Stop/Start OFF switch signal

Detects stop/start OFF switch 
status.

ABS actuator and electric unit 
(control unit)

CAN communica-
tion

Vehicle speed signal

Detects vehicle speed.

Brake booster pressure sensor 
signal

Detects a pressure in brake 
booster.

ABS operation signal

Detects ABS operation.

ESP operation signal

Detects ESP operation.

EPS control unit

CAN communica-
tion

EPS torque signal

Detects an operational state of 
EPS system.

Stop/Start inhibit signal

Receives the intelligent parking 
assist status signal sent from the 
around view monitor control unit 
through the EPS control unit.

A/C auto amp.

CAN communica-
tion

Stop/Start permit signal

Detects the air conditioning sys-
tem is ready to operate the stop/
start system. For details, refer to 

HAC-32, "STOP/START SYS-
TEM : System Description"

.

Combination meter

CAN communica-
tion

Seat belt buckle switch signal

Detects driver is sitting on the 
driver seat.

DC/DC converter

LIN communication

Operation status signal

Detects an operational state of 
DC/DC converter.

Diagnosis signal

Detects DC/DC converter mal-
function.

SYSTEM

ECH-35

< SYSTEM DESCRIPTION >

[HRA2DDT]

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SYSTEM DESCRIPTION

The stop/start system enables the engine to automatically stop/restart with a simple operation and reduces
unnecessary idling during stoplight or traffic congestion to improve fuel economy, reduce exhaust gas, and
minimize noise.
ECM detects a vehicle condition, engine condition and driver

′

s operation condition based on signals sent from

each unit and the sensors to comprehensively control the stop/start system.
The operation condition of the stop/start system is indicated by the stop/start indicator lamp on the combina-
tion meter and showing on the information display (dot matrix information display). (Refer to 

ECH-19, "Stop/

Start Indicator Lamp"

.) If a malfunction is detected in the stop/start system, the system control is automatically

deactivated and the malfunction is alerted to the driver by blinking the stop/start indicator lamp and showing
the status on the information display (dot matrix information display). When a driver

′

s operation is judged as

dangerous one during the stop/start system operation, the stop/start indicator lamp blinks at a high speed and
the status is shown on the information display (with dot matrix information display). The buzzer mounted on
the combination meter sounds simultaneously to warn the driver of the dangerous operation.
NOTE:
Starting the engine from stop/start system operation is regarded as “Restart”.

Output

Around view monitor control unit

CAN communica-
tion

Stop/Start status signal

Transmits a stop/start status sig-
nal

BCM

CAN communica-
tion

Stop/Start status signal

Transmits a stop/start status sig-
nal

ABS actuator and electric unit 
(control unit)

CAN communica-
tion

Stop/Start status signal

Transmits a stop/start status sig-
nal

EPS control unit

CAN communica-
tion

Stop/Start status signal

Transmits a stop/start status sig-
nal

EPS assist request signal

Transmits EPS assist permit/in-
hibit signal.

A/C auto amp.

CAN communica-
tion

Stop/Start status signal

Transmits a stop/start status sig-
nal

Combination meter

CAN communica-
tion

Stop/Start status signal

Transmits a stop/start status sig-
nal

Stop/Start indicator lamp request 
signal

Transmits request signal which 
turn ON the stop/start indicator 
lamp.

DC/DC converter

DC/DC converter operation check signal

Check DC/DC converter opera-
tion status.

Input/

Output

Transmits/Receives component

Signal name

Description

ECH-36

< SYSTEM DESCRIPTION >

[HRA2DDT]

SYSTEM

BASIC OPERATION

FUNCTION DESCRIPTION

When the stop/start system readiness conditions are satisfied while the vehicle is moving, the system is ready.
When the stop/start system operation conditions are satisfied while the vehicle is in a stop condition, the
engine is stopped.
During stop/start system operation, stopping time, the amount of fuel saved by the stop/start system and CO

2

saved information are indicated on the combination meter.

JSBIA3733GB

SYSTEM

ECH-37

< SYSTEM DESCRIPTION >

[HRA2DDT]

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When the engine restart conditions are satisfied, ECM activates the engine restart relay, the engine restart
bypass control relay, and the engine restart bypass relay to restart the engine. And the DC/DC converter
boosts the voltage during cranking to protect the electrical equipment from low voltage.
After restarting the engine, the stop/start indicator lamp and the indication on the information display turn OFF.
NOTE:
• When engine restart conditions are satisfied during the electric parking brake operation, ECM performs the

engine restart after the completion of the electric parking brake operation. This may cause delay in engine
restart, compared with a usual engine restart.

• When the electric parking brake operation and engine restart occur simultaneously, the electric parking

brake activates after the completion of engine restart.

Stop/Start Readiness Condition

ECM judges stop/start system is ready when the following conditions are satisfied.

*1: Depends on the vehicle conditions.
*2: If ABS system is activated, drive the vehicle at 12 km/h (7.5 MPH) or more after stop the vehicle.

CAUTION:

• The stop/start system may be cancelled when the battery is weak or if a battery other than the stop/

start system specific battery is used.

• Even though the vehicle is in above conditions, the stop/start system may be cancelled automati-

cally.

Item

Condition

Vehicle

Stop/start OFF switch

OFF (Switch indicator: OFF)

Stop/start indicator Lamp

Not blink (No malfunction)

Door (driver side)

Close

Seat belt (driver side)

Fastened

Driving history

Drive the vehicle at 20 km/h (12 MPH) or more after start the en-
gine with ignition switch

Passes 2 minutes or more after start the engine with ignition 

switch

*1

Gear position other than neutral is selected after restart

Drive the vehicle at 4 km/h (2.5 MPH) or more after restart

Passes 5 seconds or more after restart

Hood

Close

Air conditioning

Automatic air condi-
tioning

Not in DEF mode

Receives Stop/start permit signal
(for details, refer to 

HAC-32, "STOP/START SYSTEM : System 

Description"

.)

Manual air condi-
tioning

Not in DEF mode

ABS

System is normal

ABS not activated

*2

ESP not activated

EPS

System is normal

Battery status

Receives Stop/start permit signal from IPDM E/R.
(For details, refer to 

CHG-8, "ENERGY MANAGEMENT SYS-

TEM : System Description"

.)

Elevation

2,000 m (6,562 ft) or less

Intelligent parking assist

OFF

Engine

MIL (Malfunction indicator lamp)

Not illuminate (No malfunction)

Engine coolant temperature

26 - 105 

°

C (79 -221 

°

F)

Starter motor

The number of starter motor operations exceeds the specified 
times