Nissan Qashqai J11. Manual - part 474

 

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Nissan Qashqai J11. Manual - part 474

 

 

SYSTEM

EC9-51

< SYSTEM DESCRIPTION >

[R9M]

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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.

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

Drive the vehicle at 10 km/h (7 MPH) or more after restart

*2

Passes 5 seconds or more after restart (in D or R position)

Passes 15 seconds or more after restart (in N or P position)

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

*3

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 SYSTEM 

: System Description"

.)

Elevation

1,500 m (4,921 ft) or less

Intelligent parking assist

OFF

Engine

MIL (Malfunction indicator lamp)

Not illuminate (No malfunction)

DPF

Not regeneration

Engine coolant temperature

20 - 105 

°

C (69 -221 

°

F)

Fuel temperature

90 

°

C (194 

°

F) or less

Turbocharger temperature

670 

°

C (1238 

°

F) or less

Starter motor

The number of starter motor operations exceeds the specified 
times

High pressure fuel pump

The number of high pressure fuel pump operations exceeds the 
specified times

EC9-52

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

*2: When the selector lever is shifted from R position to D position.
*3: 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.
Refer to 

EC9-10, "Precaution for Stop/Start System Service"

.

Stop/Start Operation Condition

When the following conditions are satisfied, ECM stops the engine. And the combination meter turns ON a
stop/start indicator lamp.

*: The condition are not used in P range.

Restart Condition

When any of the following conditions is satisfied during stop/start system operating condition, ECM restarts
the engine. And the combination meter turns OFF the stop/start indicator lamp. 

RELATIONSHIP BETWEEN VEHICLE CONDITION AND RESTART TIMING

Item

Condition

Vehicle

Vehicle speed

Vehicle stopped [0 km/h (0 MPH)]

Steering wheel

Not steer (steering force does not occur)

Brake pedal

*

Depressed

Brake fluid pressure

*

0.8 MPa (8 bar, 8.16 kg/cm

2

, 116 psi)

Brake booster pressure

Presence of sufficient negative pressure to a brake-
force.

Vehicle angularity

Approx. 14% or less

Engine

Engine speed

Around idle speed (Approx. 850 rpm or less)

Transmission

Selector lever position

P, D or N

Item

Condition

Stop/start OFF switch

ON (Switch indicator ON)

Vehicle

Steering wheel

Steered (steering force occurs)

Door (driver side)

Open

Seat belt

Released

Driving history

Passes Approx. 3 minutes after stop/start system 
activation

Air conditioning

Automatic air conditioning

DEF switch is pressed.

Air conditioning system cannot keep the perfor-
mance. (Refer to 

HAC-32, "STOP/START SYS-

TEM : System Description"

.)

Manual air conditioning

Mode dial is in DEF position.

Brake

Brake booster pressure

Insufficient negative pressure for braking force

Brake fluid pressure

0.4 MPa (4 bar, 4.08 kg/cm

2

, 58 psi)

Accelerator pedal

Conditions differ according to shift position. For 
details, see RELATIONSHIP BETWEEN VEHI-
CLE CONDITION AND RESTART TIMING.

Selector lever

Vehicle speed

2 km/h (1.3 MPH) or more

Intelligent parking assist

Intelligent parking assist is activated.

Battery

Poor battery performance
(for details, refer to 

CHG-8, "ENERGY MANAGE-

MENT SYSTEM : System Description"

.)

SYSTEM

EC9-53

< SYSTEM DESCRIPTION >

[R9M]

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P Position

• STOP/START system operation performs when the selector lever is shifted from P position.

• STOP/START system operation by the brake pedal and accelerator pedal operation in the select lever P

position.

*: When the brake pedal and accelerator pedal are depressed simultaneously, the engine keeps on running.

N Position

• STOP/START system operation performs when the selector lever is shifted from N position.

• STOP/START system operation by the brake pedal and accelerator pedal operation in the select lever N

position.

*: When the brake pedal and accelerator pedal are depressed simultaneously, the engine keeps on running.

D Position

• STOP/START system operation performs when the selector lever is shifted from D position.

• STOP/START system operation by the brake pedal and accelerator pedal operation in the select lever D

position.

When driving the vehicle at Approx. 10 km/h or less after restart

When driving the vehicle at Approx. 10 km/h or more after restart

EARLY START-UP CONTROL

ECM detects engine reverse revolution based on the crankshaft position sensor (POS) when the stop/start
system is activated and judges a piston position on engine stop to reduce the time for restarting the engine.

VOLTAGE STABILIZER FUNCTION

ECM transmits a voltage stabilizer signal to the DC/DC converter during cranking at an engine restart. The
DC/DC converter temporarily increases the voltage to prevent the electric equipment from reset due to low

Selector lever position

P

R

N

D

Engine status

Stop

Restart

Stop

Restart

Vehicle speed

0 km/h (0 MPH)

Brake pedal

ON

OFF

Accelerator pedal

OFF

ON

OFF

ON

*

OFF

Engine status

Stop

Restart

Stop

Restart

Stop

Selector lever position

P

R

N

D

Engine status

Stop

Restart

Stop

Restart

Vehicle speed

0 km/h (0 MPH)

Brake pedal

ON

OFF

ON

Accelerator pedal

OFF

ON

OFF

ON

*

OFF

Engine status

Stop

Restart

Stop

Restart

Run

Stop

Selector lever position

P

R

N

D

Engine status

Stop

Restart

Stop

Stop

Vehicle speed

0 km/h

10 km/h (7 MPH) or less

0 km/h

Brake pedal

ON

OFF

ON

Accelerator pedal

OFF

ON

OFF

ON

OFF

Engine status

Stop

Restart

Run

Vehicle speed

0 km/h

10 km/h (7 MPH) or more

0 km/h

Brake pedal

ON

OFF

ON

Accelerator pedal

OFF

ON

OFF

ON

OFF

Engine status

Stop

Restart

Run

Stop

EC9-54

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

voltage. The adoption of the DC/DC converter enables a stable power supply to the electric equipment con-
nected to the DC/DC converter and permits a substantial lowering of the voltage. For the electrical equipment
connected to the DC/DC converter, see “SYSTEM DIAGRAM”.
NOTE:
The brightness of the head lamps may be changed due to the voltage reduction at an engine restart because
they are not connected to the DC/DC converter.

ENGINE RESTART BYPASS RELAY CONTROL

ECM controls the engine restart bypass control relay and activates
the engine restart bypass relay. When the restart conditions are sat-
isfied, ECM turns ON the engine restart bypass control relay instan-
taneously right after the restart and opens the engine restart bypass
relay. This allows a current to pass the inner resistance circuit right
after the starter motor is activated. When the starter motor is rotat-
ing, the voltage is directly supplied to the starter motor without being
passed through the inner resistance circuit in the engine restart
bypass relay because the engine restart bypass relay is closed. In
this way, ECM enables the battery voltage stabilization and reduces
the battery deterioration rate by decreasing the battery voltage drop
resulted from clanking at an engine restart.

ENERGY MANAGEMENT SYSTEM

ENERGY MANAGEMENT SYSTEM : System Description

INFOID:0000000010308991

DESCRIPTION

ECM transmits a target power generation voltage signal received from IPDM E/R to the generator via LIN
communication.
The generator includes a self-diagnosis function and transmits a diagnosis signal to ECM via LIN communica-
tion when detecting a malfunction. When ECM receives a diagnosis signal, ECM detects DTC and transmits a
charge warning lamp request signal to the combination meter to turn ON the charge warning lamp.
For details of ENERGY MANAGEMENT SYSTEM, refer to 

CHG-8, "ENERGY MANAGEMENT SYSTEM :

System Description"

.

CAN COMMUNICATION

CAN COMMUNICATION : System Description

INFOID:0000000010308992

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 a 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.
Refer to 

LAN-51, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart"

, about CAN com-

munication for detail.

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