Qashqai J11. Engine control system (R9M) - part 3

 

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Qashqai J11. Engine control system (R9M) - part 3

 

 

SYSTEM

EC9-33

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pressure in the rail. The measurement circuit consists of an pressure sensor on the rail and transmits the pres-
sure signal to ECM.
The high-pressure pump is self-supplied by an integrated gear pump. This supplies the rail, whose pressure is
controlled for loading by the fuel flow actuator. The flow regulation actuator allows the high-pressure fuel pump
to supply only the necessary quantity of diesel for maintaining pressure in the rail.
Pressure regulation can be done with one actuator in case of magnetic injectors because of their natural leak
during injector closing.

INJECTION CONTROL

The injection control parameters are the quantities to inject and their respective advances. The system per-
forms one to five injections.
The injectors are magnetic injectors. An electrical current (pulse) is sent to each injector holder based on the
previously computed data.
To control injector, ECM punctually drivers energy to obtain actuator deformation and the injector opening.
During the injection time, the length of electrical pulse is computed with the fuel flow demand and injectors cor-
rections. The system has three injector corrections:
• Injector adjustment value registration
• Zero fuel calibration
• Pressure wave correction

Injector Adjustment Value Registration

Injector adjustment value indicates manufacturing tolerance. The injector adjustment value which is correctly
stored in ECM is needed for precise fuel injection control. A performance of emission control and a driveability
may effect when there is a mismatch between the following two values.
• The injector adjustment value stored in ECM
• The injector adjustment value of the injector which is installed on the vehicle

Zero Fuel Calibration (ZFC)

During the lifetime of an injector, it is subject to thermal and mechanical constraints that modify the injection
characteristics. This wear-and-tear on the orifices (blocked or expanded holes) causes drift in the quantity of
injected fuel, which can lead to smoke generation or increased noise. To compensate for this drift, ECM imple-
ments a teach-in in the raised foot phase and under certain condition, which allows it to regulate the ZFC cor-
rector parameter.

Pressure Wave Correction:

The first injection causes a pressure wave in the pipe between rail and injector and the bores in the injector
itself. The quantity of the next injections is influenced by this pressure wave.
Main parameters of this influence are:
• Rail pressure
• Distance between the two injections
• Fuel temperature
• Injection quantities of both injections
The pressure wave correction minimizes the influence of the first injection on the next injections with simple
structure and parameters which can be measured.

TEMPERATURE BEFORE TURBINE CONTROL

Upstream turbine temperature control sequentially uses injection parameters:
• Main injection phasing
• Post injection fuel mass
• Total fuel mass quantity
• Maximum torque
In normal combustion mode (without regeneration), the regulation aims to protect the turbine. If the tempera-
ture exceeds the recommended limits, the regulation is able to limit total fuel mass quantity and torque
demand.
In regeneration mode, to increase the temperature in exhaust line, the regulation controls main injection phas-
ing and post injection.
The purpose is to obtain the highest temperature while respecting the recommended limits. In addition, the
regulation protects the turbine when the temperature is too hot.

WATER IN FUEL FUNCTION

The water in fuel detection sensor is an optional sensor integrated in the fuel filter. This function prevents seri-
ous damages on the common-rail system caused by water presence.

AFTER TREATMENT SYSTEM

EC9-34

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

AFTER TREATMENT SYSTEM : System Description

INFOID:0000000010308986

DESCRIPTION

This system has two main functions:
• Use the present oxygen in exhaust gases to transform the CO in CO2, and the HC in CO2 and H2O.
• Increase the temperature of exhaust gases (with the exothermal energy of the oxidation reaction) to allow

the regeneration in the DPF (Diesel Particulate Filter).

To be effective, the catalytic converter must reach the working temperature of 350 to 400

°

C (662 to 752

°

F).

NOX TRAP

On diesel engines, it is possible to reduce the NOx produced by the engine by inserting a NOx-trap into the
exhaust line. This system works by alternating phase of load and phases of purges.
There are two types of purge, depending on the pollutant type:
• NOx purge
• SOx purge
These purges are made of alternative rich and lean phases, so in order to control them a O2 downstream pro-
portional sensor is added to the system.
The management of these requests has to manage the compromise between:
• Improve the NOx emission (objective leading to increase the number of purges)
• Do not impact on the customer on the fuel consumption and of the oil change interval (objective leading to

decrease the number of purges)

DPF (DIESEL PARTICULATE FILTER)

The DPF filters up to 99% of the soot particulates that have not been filtered out up to this point. These partic-
ulates consist essentially of aggregates of variable size. The quantity of particulates and their composition
depend on:
• The combustion process (an homogeneous air/fuel mixture minimizes particulate formation)
• The quantity of diesel (increasing the cetane index limits the number of particulates formed)
• The post-processing efficiency (only filtration allows the particulates to be removed efficiently)
The DPF is a porous structure with channels set out in such a way as to force the exhaust gases through the
chamber walls.
In normal operation, DPF captures all the particulates emitted by the engine and so fills up progressively. It
therefore becomes necessary to eliminate all the accumulated particulates, which is done by combustion
(regeneration).

REGULATION OF TEMPERATURE BEFORE DPF

Regulation of the exhaust gas temperature before DPF is needed to complete a secure regeneration. This
strategy uses both exhaust line injectors and late post injections (fuel injectors).
ECM computes the fuel mass flow injected by injectors (post injection) according to several parameters:
• Exhaust line temperature before DPF
• Atmospheric pressure
• Intake air temperature
• Differential pressure of the CSF
• Minimum level of fuel
• Engine speed
• Engine torque

COOLING FAN CONTROL

COOLING FAN CONTROL : System Description

INFOID:0000000010308983

SYSTEM DESCRIPTION

The cooling of the engine is done by a double speed motor driven fan unit (FAN1: small speed; FAN2: high
speed). The ECM controls cooling fan relays through CAN communication line.

When the engine is running

To cool the engine, a request for FAN1 activation is sent when the engine coolant temperature exceeds 94

°

C

(201

°

F) and a deactivated request is sent when the engine coolant temperature becomes lower than 92

°

C

(197

°

F).

When the engine coolant temperature continues to increase, a request for FAN2 activation is sent when the
engine coolant temperature exceeds 100

°

C (212

°

F) and a deactivated request is sent when the engine cool-

ant temperature becomes lower than 98

°

C (208

°

F).

SYSTEM

EC9-35

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When the engine coolant temperature continues to increase and exceeds the alert threshold, ECM judges the
engine is over temperature.
In case of an abnormally high engine coolant temperature, the maximum engine torque is reduced; the driver
will then feel a lack of engine power.

When the engine is not running

Only a FAN1 activation request can be sent for anti-percolation purpose (engine stopped with high engine
coolant temperature). The anti-percolation function is active after ignition switch OFF for a defined maximum
time. At ignition switch OFF, a FAN1 activation request is sent if the engine coolant temperature exceeds
specified temperature and a cutting request is sent when the engine coolant temperature becomes lower.
When there is a default on the engine coolant temperature signal, the FAN1 activation is permanently
requested (engine running).
In addition to this, depending on the equipment mounted on the vehicle, the ECM can also send an activation
request for air conditioning needs or automatic transmission needs or DPF (Diesel Particulate Filter) regener-
ation needs.

THERMOSTAT CONTROL

THERMOSTAT CONTROL : System Description

INFOID:0000000010308984

SYSTEM DRAWING

For system drawing of the thermostat control, Refer to 

CO-85, "Engine Cooling System"

.

DESCRIPTION

This engine has an engine coolant bypass valve and a thermoplunger and uses them for improving a warm-up
time.

Thermoplunger

The thermoplunger is installed to the engine coolant line and directly warms up engine coolant.
ECM transmits a thermoplunger operating signal to the thermoplunger control unit when engine coolant tem-
perature is low.
The thermoplunger control unit applies power to the thermoplunger according to the received signal and
warms up engine coolant.
In addition, ECM activates the thermoplunger during DPF (Diesel Particulate Filter) regeneration and
increases electric load for get more engine load to perform normal DPF regeneration.
ECM controls thermoplunger based on the following information.
• Engine coolant temperature
• Battery voltage
• Engine speed
• Alternator load

Engine Coolant Bypass Valve

The engine coolant bypass valve circulates engine coolant within a narrow range and accelerates a warm-up
by closing the valve and cutting off the engine coolant passage.
ECM applies power to the engine coolant bypass valve control solenoid valve when engine coolant tempera-
ture is low.
The engine coolant bypass valve control solenoid valve switches the passage of negative pressure (vacuum)
sent from the vacuum pump. When power is applied to the solenoid valve, negative pressure is applied to the
engine coolant bypass valve. Accordingly, the engine coolant bypass valve closes.

GLOW CONTROL

GLOW CONTROL : System Description

INFOID:0000000010308985

SYSTEM DESCRIPTION

Glow control system operates at engine starting and after engine starting. The system energizes glow plug
according to engine coolant temperature to improve engine starting function.
When the ignition switch is turned ON, the glow control system starts Pre-glow and the glow indicator lamp
turns ON. When the engine starts, the glow indicator lamp turns OFF and the glow control state changes to
After-glow.
Glow time varies according to engine coolant temperature, barometric pressure and battery voltage.

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC9-36

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description

INFOID:0000000010308988

BASIC ASCD SYSTEM

Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 170 km/h (105 MPH).
ECM controls fuel injector to regulate engine speed.
Operation status of ASCD is indicated on the information display in the combination meter. If any malfunction
occurs in ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.

SET OPERATION

Press ASCD MAIN switch. (CRUISE indicated on the information display)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 170 km/h (105
MPH), press SET/COAST switch. (SET indicated on the information display)

ACCELERATE OPERATION

If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will keep the new set speed.

CANCEL OPERATION

When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
• Brake pedal is depressed
• Clutch pedal is depressed or gear position is changed to neutral position. 
• Vehicle speed decreased under 15% of the set speed from the set speed.
• TCS system is operated.
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicator.
• Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE indicator may

blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE indicator will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.

• Malfunction for some self-diagnoses regarding ASCD control: SET indicator will blink quickly.
If MAIN switch is turned to OFF during ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.

COAST OPERATION

When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will keep the new set speed.

RESUME OPERATION

When the RESUME/ACCELERATE switch is pressed after cancel operation other than pressing ASCD MAIN
switch is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition
must meet following conditions.
• Brake pedal is released
• Clutch pedal is released 
• Vehicle speed is greater than 40 km/h (25 MPH) and less than 170 km/h (105 MPH)

SPEED LIMITER

SPEED LIMITER : System Description

INFOID:0000000010308989

BASIC SPEED LIMITER SYSTEM

The speed limiter is a system that enables to restrict the vehicle speed within the set speed that is selected by
the driver. Driver can set vehicle speed between 30 km/h and 180 km/h (in the metric system mode) or 20
MPH and 115 MPH (in the yard/pound system mode). ECM controls fuel injector to regulate vehicle speed.
Operation status of speed limiter is indicated on the information display in the combination meter. If any mal-
function occurs in speed limiter system, it automatically deactivates control.

SYSTEM

EC9-37

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NOTE:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.

SET OPERATION

Press speed limiter MAIN switch. (LIMIT indicated on the information display)
By pressing the SET/COAST switch, the vehicle speed can be set within the range between 30 km/h (20
MPH) and 180 km/h (115 MPH). (SET and set speed is indicated on the information display)
When pressing the RESUME/ACCELERATE switch, the set speed can be increased.
When pressing the SET/COAST switch, the set speed can be decreased.

CANCEL OPERATION

When any of following conditions exist, speed limiter operation will be canceled.
• Speed limiter MAIN switch pressed (Set speed will be cleared)
• ASCD MAIN switch pressed (Set speed will be cleared)
• CANCEL switch is pressed
• Accelerator pedal is fully depressed (kickdown)

When the accelerator pedal is depressed within the range shown in the figure (A) below, the accelerator
pedal reaction force strengthens. Further depressing the accelerator pedal within the (C) range cancels the
speed limiter. This allows acceleration in emergencies.

RESUME OPERATION

After the speed limiter is released by other method than the MAIN switch, the RESUME/ACCELERATE switch
allows to set the vehicle speed again to the one that is previously set before releasing the speed limiter.

GEAR SHIFT INDICATOR SYSTEM

JMBIA1518GB

EC9-38

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

GEAR SHIFT INDICATOR SYSTEM : System Description

INFOID:0000000010438161

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

The gear shift indicator is controlled by ECM and indicates recommended gear shift timing on the combination
meter.
• Upward arrow indication (

): Upshift recommendation

• Downward arrow indication (

): Downshift recommendation

ECM calculates optimal gear shift timing for better fuel consumption, according to the input signal and a gear
ratio. In addition, the recommended gear shift timing is corrected, according to driver’s operation and road
conditions. ECM transmits a gear shift indicator signal to the combination meter via CAN communication line.
The gear shift indicator is deactivated when any of the following conditions is satisfied;
• Shift lever is in neutral position.
• Vehicle is under cruise control (ASCD function) or speed limit (speed limiter function).
• MIL (Malfunction Indicator Lamp) is indicated.
• ABS system or ESP system is operating.

STOP/START SYSTEM

JSBIA5004GB

SYSTEM

EC9-39

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STOP/START SYSTEM : System Description (M/T models)

INFOID:0000000010308990

SYSTEM DIAGRAM

INPUT/OUTPUT SIGNAL CHART

JSBIA5071GB

EC9-40

< SYSTEM DESCRIPTION >

[R9M]

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 the IPDM E/R is ready to 
operate the stop/start system. 
For details, refer to 

CHG-8, "EN-

ERGY MANAGEMENT SYS-
TEM : 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

EC9-41

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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 

EC9-24, "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

EC9-42

< SYSTEM DESCRIPTION >

[R9M]

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. (With dot matrix information display. Refer to 

MWI-

17, "INFORMATION DISPLAY : System Description"

.)

JSBIA3733GB

SYSTEM

EC9-43

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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

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 SYSTEM 

: System Description"

.)

Elevation

2,000 m (6,562 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

EC9-44

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

*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.
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.

NOTE:
During the operation of the stop/start system, the stop/start system continues operating even if the vehicle is
stopped by using the parking brake.

Restart Condition

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

*: Restart timing varies according to vehicle condition. For details, refer to RELATIONSHIP BETWEEN VEHI-
CLE CONDITION AND RESTART TIMING.
NOTE:
In models with M/T, the stop/start system operates continuously even if the steering wheel is operated during
the system operating condition.

Restart Inhibit Mode

When the any of the following condition is satisfied during stop/start system operating condition, ECM inhibits
restart of the engine (go into a state in ENGINE STALL). In this case, the engine needs to be started with igni-
tion switch.

Item

Condition

Vehicle

Stop/start readiness condition

Ready

Vehicle speed

Vehicle stopped [0 km/h (0 MPH)]

Steering wheel

Not steer (steering force does not occur)

Brake booster pressure

Presence of sufficient negative pressure to a brake-
force. (Refer to 

BRC-36, "BRAKE FORCE DISTRI-

BUTION FUNCTION : System Description"

.)

Clutch pedal position

Released

Engine

Engine speed

Around idle speed (Approx. 850 rpm or less)

Transmission

Shift lever position

Neutral position

Item

Condition

Stop/start OFF switch

ON (Switch indicator: ON)

Clutch pedal position

Fully depressed

*

Air conditioning

Automatic air conditioning

DEF switch is pressed.

Air conditioning system cannot keep the perfor-
mance.

Manual air conditioning

Mode dial is in DEF position.

Brake booster pressure

Insufficient negative pressure for braking force

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

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*: When the condition is satisfied either door open or seat belt released, ECM transitions to the recovery wait-
ing mode (not ENGINE STALL) for approximately 5 minutes. In this case, the engine is able to start by clutch
operation.

RELATIONSHIP BETWEEN VEHICLE CONDITION AND RESTART TIMING

ECM detects clutch pedal position based on the clutch pedal position switch signal and clutch interlock switch
signal. The engine restart timing varies with gear position, vehicle speed, and clutch position.

 Engine restart condition

x: Restart —: Not restart

NOTE:
If the above mentioned “Not restart” condition occurs during restart, ECM stops cranking and returns to the
stop/start system operating condition (engine stop).

ENGINE STALL ASSIST FUNCTION

The engine stall assist function allows the engine to start only with a clutch operation without operating the
ignition switch when a clutch operation is unsuccessful during vehicle start.
When an engine stall caused by a clutch operation error is detected, the stop/start system enters the recovery
waiting mode and ECM indicates the activation of engine stall assist function by illuminating the stop/start indi-
cator lamp. When the clutch pedal is depressed under this condition, the engine starts.
NOTE:
This function also operates at an engine start other than the one performed during stop/start system operation.
This function operates when the following conditions are satisfied:
• After engine warm-up.
• Vehicle stopped. (No vehicle speed input.)
• The battery is charged enough.
• No malfunctions in the engine control system and the stop/start system. (No DTC detected.)

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
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.

Item

Condition

Engine hood

Opened

Driver presence

*

Absent: Both of the following conditions are 
satisfied.
• Seat belt (driver side): Released
• Door (driver side): Open

Vehicle condition

Clutch pedal position

Vehicle 

speed

Gear 

position

Fully depressed

Half depressed

Released

Clutch pedal 

position SW

Clutch interlock 

SW

Clutch pedal 

position SW

Clutch interlock 

SW

Clutch pedal 

position SW

Clutch interlock 

SW

OFF

ON

OFF

OFF

ON

OFF

Vehicle 

stopped

Neutral

x

x

Except 
neutral

x

Vehicle 

speed oc-

curs

Neutral

x

x

x

Except 
neutral

x

EC9-46

< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

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 cranking at an engine restart.

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SYSTEM

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STOP/START SYSTEM : System Description (CVT models)

INFOID:0000000010479132

SYSTEM DIAGRAM

INPUT/OUTPUT SIGNAL CHART

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< SYSTEM DESCRIPTION >

[R9M]

SYSTEM

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.

 

 

 

 

 

 

 

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