Nissan Qashqai J11. Manual — part 474
SYSTEM
EC9-51
< SYSTEM DESCRIPTION >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
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
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
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
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
MENT SYSTEM : System Description"
.)
SYSTEM
EC9-53
< SYSTEM DESCRIPTION >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC9
N
P
O
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 :
.
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"
munication for detail.
JSBIA1709GB
JSBIA1710GB
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