Nissan X-Trail 32. Manual - part 932

SYSTEM

EC-857

< SYSTEM DESCRIPTION >

[R9M]

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Input/

Output

Transmits/Receives component

Signal name

Description

Input

Accelerator pedal position sen-
sor (integrated ECM)

Accelerator pedal position sensor signal

Detects an accelerator pedal posi-
tion.

Brake pedal position switch

Brake pedal position switch signal

Detects the brake pedal is de-
pressed.

Crankshaft position sensor

Crankshaft position sensor signal

Detects an engine speed.

Engine coolant temperature 
sensor

Engine coolant temperature sensor signal

Detects an engine coolant tempera-
ture.

Atmospheric pressure sensor
(integrated in ECM)

Atmospheric pressure sensor signal

Detects an atmospheric pressure.

IPDM E/R

CAN communi-
cation

Stop/Start permit signal

Detects the transmission is ready to 
operate the stop/start system.

Battery current signal

Detects battery current.

Hood switch signal

Detects engine hood status.

Battery current sensor malfunc-
tion signal

Detects the battery current sensor is 
normal.

BCM

CAN communi-
cation

Ignition switch status signal

Detects ignition switch status.

Stop lamp switch signal

Detects an accelerator pedal posi-
tion.

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 communi-
cation

Vehicle speed signal

Detects vehicle speed.

Brake fluid pressure sensor sig-
nal

Detects brake fluid pressure.

Brake booster pressure sensor 
signal

Detects a pressure in brake booster.

ABS operation signal

Detects ABS operation.

ESP operation signal

Detects ESP operation.

Brake hold readiness signal

Detects the brake hold readiness 
status judged by the ABS actuator 
and electric unit (control unit). 

EPS control unit

CAN communi-
cation

EPS torque signal

Detects an operational state of EPS 
system.

Stop/Start inhibit signal

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

A/C auto amp.

CAN communi-
cation

Stop/Start permit signal

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

Combination meter

CAN communi-
cation

Seat belt buckle switch signal

Detects driver is sitting on the driver 
seat.

TCM

CAN communi-
cation

Stop/Start permit signal

Detects the transmission is ready to 
operate the stop/start system.

Shift position signal

Detects the transmission is ready to 
operate the stop/start system.

G sensor signal

Detects vehicle angularity.

DC/DC converter

LIN communica-
tion

Operation status signal

Detects an operational state of DC/
DC converter.

Diagnosis signal

Detects DC/DC converter malfunc-
tion.

EC-858

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

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 

EC-824, "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 communi-
cation

Stop/Start status signal

Transmits a stop/start status signal

BCM

CAN communi-
cation

Stop/Start status signal

Transmits a stop/start status signal

ABS actuator and electric unit 
(control unit)

CAN communi-
cation

Stop/Start status signal

Transmits a stop/start status signal

Brake hold request signal

Transmits the brake hold/release re-
quest according to the stop/start sys-
tem.

EPS control unit

CAN communi-
cation

Stop/Start status signal

Transmits a stop/start status signal

EPS assist request signal

Transmits EPS assist permit/inhibit 
signal.

A/C auto amp.

CAN communi-
cation

Stop/Start status signal

Transmits a stop/start status signal

TCM

CAN communi-
cation

Stop/Start status signal

Transmits a stop/start status signal

Combination meter

CAN communi-
cation

Stop/Start status signal

Transmits a stop/start status signal

Stop/Start indicator lamp request 
signal

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

DC/DC converter

LIN communica-
tion

DC/DC converter operation 
check signal

Checks DC/DC converter operation 
status.

DC/DC voltage request signal

Controls the DC/DC output voltage.

Input/

Output

Transmits/Receives component

Signal name

Description

SYSTEM

EC-859

< SYSTEM DESCRIPTION >

[R9M]

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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.
In addition, the CVT electric oil pump is activated to supply oil pressure to the clutch and the pulley.

JSBIA5087GB

EC-860

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

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-36, "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