Juke F15 (2012 year). Service Repair Manual

COMPONENT PARTS

EC-465

< SYSTEM DESCRIPTION >

[HR16DE]

The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature.

OPERATION

Ignition Coil With Power Transistor

INFOID:0000000006496202

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.

Intake Air Temperature Sensor

INFOID:0000000006496203

The intake air temperature sensor is built-into mass air flow sensor
(1). The sensor detects intake air temperature and transmits a signal
to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.

<Reference data>

*: These data are reference values and are measured between ECM terminals 46
(Intake air temperature sensor signal) and 55.

Sensor

Input signal to ECM

ECM function

Actuator

Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)

Engine speed

Heated oxygen sensor 2
heater control

Heated oxygen sensor 2 heater

Engine coolant temperature sensor

Engine coolant temperature

Mass air flow sensor

Amount of intake air

Engine speed

Heated oxygen sensor 2 heater

Above 3,600 rpm

OFF

Below 3,600 rpm after the following conditions are met.
• Engine: After warming up
• Keeping the engine speed between 3,500 and 4,000 rpm for 1

minute and at idle for 1 minute under no load

PBIA9559J

Intake air temperature [

C (

F)]

Voltage* (V)

Resistance (k

Ω

)

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

SEF012P

EC-466

< SYSTEM DESCRIPTION >

[HR16DE]

COMPONENT PARTS

Intake Valve Timing Control Solenoid Valve

INFOID:0000000006496204

Intake valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow through intake valve timing control unit
or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control
position.

Knock Sensor

INFOID:0000000006496205

The knock sensor is attached to the cylinder block. It senses engine
knocking using a piezoelectric element. A knocking vibration from
the cylinder block is sensed as vibrational pressure. This pressure is
converted into a voltage signal and sent to the ECM.

Malfunction Indicator

INFOID:0000000006496206

The Malfunction Indicator (MI) is located on the combination meter.
The MI will light up when the ignition switch is turned ON without the
engine running. This is a bulb check.
When the engine is started, the MI should turn off. If the MI remains
illuminated, the on board diagnostic system has detected an engine
system malfunction.
For details, refer to

EC-497, "DIAGNOSIS DESCRIPTION : Malfunc-

tion Indicator (MI)"

Mass Air Flow Sensor

INFOID:0000000006496207

The mass air flow sensor (1) is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.

PBIB1842E

JSBIA0284ZZ

SAT652J

PBIA9559J

COMPONENT PARTS

EC-467

< SYSTEM DESCRIPTION >

[HR16DE]

Oil Pressure Warning Lamp

INFOID:0000000006635112

Oil pressure warning lamp is located on the combination meter.
It indicates the low pressure of the engine oil and the malfunction of
the engine oil pressure system.
Combination meter turns the oil pressure warning lamp ON/OFF
according to the oil pressure warning lamp signal received from
ECM via CAN communication.
For details, refer to

EC-485, "ENGINE PROTECTION CONTROL AT

LOW ENGINE OIL PRESSURE : System Description"

Refrigerant Pressure Sensor

INFOID:0000000006496209

The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an
electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent
to ECM, and ECM controls cooling fan system.

Stop Lamp Switch & Brake Pesal Position Switch

INFOID:0000000006496210

Stop lamp switch and brake pedal position switch are installed to pedal bracket.
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).

Throttle Control Motor

INFOID:0000000006496211

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feed-
back to the ECM to control the throttle valve in response to driving conditions via the throttle control motor.

Throttle Control Motor Relay

INFOID:0000000006496212

Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle
control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends
an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition
switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not
provided to the ECM.

PBIA8559J

PBIB2657E

Brake pedal

Brake pedal position switch

Stop lamp switch

Released

OFF

Depressed

OFF

EC-468

< SYSTEM DESCRIPTION >

[HR16DE]

COMPONENT PARTS

Throttle Position Sensor

INFOID:0000000006496213

Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve in response to driving conditions
via the throttle control motor.

PBIB0145E

STRUCTURE AND OPERATION

EC-469

< SYSTEM DESCRIPTION >

[HR16DE]

STRUCTURE AND OPERATION

Positive Crankcase Ventilation

INFOID:0000000006496208

This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV
valve.
Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes
through the hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.
The flow goes through the hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all condi-
tions.

PBIB2962E

PBIB1588E

SYSTEM

EC-471

< SYSTEM DESCRIPTION >

[HR16DE]

ENGINE CONTROL SYSTEM : System Description

INFOID:0000000006496215

ECM performs various controls such as fuel injection control and ignition timing control.

MULTIPORT FUEL INJECTION SYSTEM

MULTIPORT FUEL INJECTION SYSTEM : System Diagram

INFOID:0000000006496217

MULTIPORT FUEL INJECTION SYSTEM : System Description

INFOID:0000000006496218

INPUT/OUTPUT SIGNAL CHART

JSBIA0113GB

EC-472

< SYSTEM DESCRIPTION >

[HR16DE]

SYSTEM

*1: M/T models
*2: CVT models
*3: This sensor is not used to control the engine system under normal conditions.
*4: ECM determines the start signal status by the signals of engine speed and battery voltage.
*5: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from the crankshaft position sensor, camshaft position sen-
sor and the mass air flow sensor.

VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION

In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.

• During warm-up
• When starting the engine
• During acceleration
• Hot-engine operation
• When selector lever position is changed from N to D (CVT models)
• High-load, high-speed operation

• During deceleration
• During high engine speed operation

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor

Engine speed

Piston position

Fuel injection & mixture
ratio control

Fuel injector

Camshaft position sensor

Mass air flow sensor

Amount of intake air

Intake air temperature sensor

Intake air temperature

Engine coolant temperature sensor

Engine coolant temperature

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Park/neutral position (PNP) switch

PNP signal

Transmission range switch

Battery

Battery voltage

Knock sensor

Engine knocking condition

Heated oxygen sensor 2

Density of oxygen in exhaust gas

EPS control unit

EPS operation signal

Combination meter

Vehicle speed

BCM

A/C ON signal

Blower fan signal

SYSTEM

EC-473

< SYSTEM DESCRIPTION >

[HR16DE]

MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)

The mixture ratio feedback system provides the best air-fuel mixture ratio for drivability and emission control.
The three way catalyst (manifold) can better reduce CO, HC and NOx emissions. This system uses A/F sen-
sor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The ECM adjusts the
injection pulse width according to the sensor voltage signal. For more information about A/F sensor 1, refer to

EC-459, "Air Fuel Ratio Sensor 1"

. This maintains the mixture ratio within the range of stoichiometric (ideal air-

fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching
characteristics of A/F sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from heated
oxygen sensor 2.
• Open Loop Control

The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.

- Deceleration and acceleration
- High-load, high-speed operation
- Malfunction of A/F sensor 1 or its circuit
- Insufficient activation of heated sensor 1 at low engine coolant temperature
- High engine coolant temperature
- During warm-up
- After shifting from N to D (CVT models)
- When starting the engine

MIXTURE RATIO SELF-LEARNING CONTROL

The mixture ratio feedback control system monitors the mixture ratio signal transmitted from A/F sensor 1.
This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoret-
ical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally
designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes dur-
ing operation (i.e., fuel injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes “short-term fuel trim” and “long-term fuel trim”.
“Short-term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the-
oretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in
fuel volume if it is lean.
“Long-term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation
of the “short-term fuel trim” from the central value. Such deviation will occur due to individual engine differ-
ences, wear over time and changes in the usage environment.

PBIB2793E

EC-474

< SYSTEM DESCRIPTION >

[HR16DE]

SYSTEM

FUEL INJECTION TIMING

Two types of systems are used.
• Sequential Multiport Fuel Injection System

Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.

• Simultaneous Multiport Fuel Injection System

Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals
of the same width are simultaneously transmitted from the ECM.
The four injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail safe system (CPU) is operating.

FUEL SHUT-OFF

Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speeds.

ELECTRIC IGNITION SYSTEM

ELECTRIC IGNITION SYSTEM : System Diagram

INFOID:0000000006496219

ELECTRIC IGNITION SYSTEM : System Description

INFOID:0000000006496220

INPUT/OUTPUT SIGNAL CHART

SEF337W

JSBIA0076GB

SYSTEM

EC-475

< SYSTEM DESCRIPTION >

[HR16DE]

*1: M/T models
*2: CVT models
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
*4: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

Firing order: 1 - 3 - 4 - 2
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor signal. Comput-
ing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.
• At starting
• During warm-up
• At idle
• At low battery voltage
• During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.

AIR CONDITIONING CUT CONTROL

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor

Engine speed

Piston position

Ignition timing control

Ignition coil (with power transistor)

Camshaft position sensor

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Park/neutral position (PNP) switch

PNP signal

Transmission range switch

Battery

Battery voltage

Knock sensor

Engine knocking

Combination meter

Vehicle speed

EC-476

< SYSTEM DESCRIPTION >

[HR16DE]

SYSTEM

AIR CONDITIONING CUT CONTROL : System Diagram

INFOID:0000000006496221

AIR CONDITIONING CUT CONTROL : System Description

INFOID:0000000006496222

INPUT/OUTPUT SIGNAL CHART

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
• When the accelerator pedal is fully depressed.
• When cranking the engine.
• At high engine speeds.
• When the engine coolant temperature becomes excessively high.
• When operating power steering during low engine speed or low vehicle speed.
• When engine speed is excessively low.
• When refrigerant pressure is excessively low or high.

JSBIA0320GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor
Camshaft position sensor

Engine speed

Piston position

A/C compressor request
signal

IPDM E/R

↓

Air conditioner relay

↓

Compressor

Engine coolant temperature sensor

Engine coolant temperature

Accelerator pedal position sensor

Accelerator pedal position

Battery

Battery voltage

Refrigerant pressure sensor

Refrigerant pressure

EPS control unit

EPS operation signal

Combination meter

Vehicle speed signal

BCM

A/C ON signal

Blower fan signal

SYSTEM

EC-477

< SYSTEM DESCRIPTION >

[HR16DE]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Diagram

INFOID:0000000006496223

AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description

INFOID:0000000006496224

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM via the CAN communication line

BASIC ASCD SYSTEM

• Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed

without depressing accelerator pedal. Driver can be set the vehicle speed in the set speed range.

• ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
• Operation status of ASCD is indicated in combination meter.
• If any malfunction occurs in the ASCD system, it automatically deactivates the ASCD control.
Refer to

EC-487, "AUTMATIC SPEED CONTROL DEVICE (ASCD) : Switch Name and Function"

for ASCD

operating instructions.

CAUTION:

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

SPEED LIMITER

JPBIA4713GB

Sensor

Input signal to ECM

ECM function

Actuator

ASCD steering switch

ASCD steering switch operation

ASCD vehicle speed control

Electric throttle control actuator

Brake pedal position switch

Brake pedal operation

Stop lamp switch

Transmission range switch
(CVT models)

PNP signal

Park/neutral position switch
(M/T models)

Clutch pedal position switch
(M/T models)

Clutch pedal operation

Combination meter

Vehicle speed signal*

TCM
(CVT models)

Output shafut revolution signal*

EC-478

< SYSTEM DESCRIPTION >

[HR16DE]

SYSTEM

SPEED LIMITER : System Diagram

INFOID:0000000006496225

SPEED LIMITER : System Description

INFOID:0000000006496226

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM through CAN communication line

BASIC SPEED LIMITER SYSTEM

• Speed limiter is a system that enables to restrict the vehicle speed within the set speed that is selected by

the driver. Driver can be set the vehicle speed in the set speed range.

• ECM controls throttle angle of electric throttle control actuator to regulate vehicle speed.
• Operation status of speed limiter is indicated on the information display in the combination meter.
• Unlike cancel conditions for ASCD, the speed limiter is not cancelled even when the clutch pedal is

depressed. ECM detects a clutch pedal position switch signal and controls engine revolutions to maintain a
set speed when shifting gears.

• If any malfunction occurs in speed limiter system, it automatically deactivates the speed limiter control.
Refer to

EC-488, "SPEED LIMITER : Switch Name and Function"

for speed limiter operating instructions.

CAUTION:

Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
NOTE:
Since the speed limiter is controlled by the electric throttle control actuator, vehicle speed may exceed a set
speed during downhill driving.

CAN COMMUNICATION

CAN COMMUNICATION : System Description

INFOID:0000000006496227

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.

JPBIA4712GB

Sensor

Input signal to ECM

ECM function

Actuator

Accelerator pedal position sensor

Accelerator pedal position

• Speed limiter vehicle

speed control

• Speed limiter operation

signal*

• Electric throttle control actuator
• Combination meter

(Information display)

ASCD steering switch

ASCD steering switch operation

Clutch pedal position switch
(M/T models)

Clutch pedal operation

Combination meter

Vehicle speed*

SYSTEM

EC-479

< SYSTEM DESCRIPTION >

[HR16DE]

Refer to

LAN-31, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart"

, about CAN com-

munication for detail.

COOLING FAN CONTROL

COOLING FAN CONTROL : System Diagram

INFOID:0000000006496228

COOLING FAN CONTROL : System Description

INFOID:0000000006496229

INPUT/OUTPUT SIGNAL CHART

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM through CAN communication line.

SYSTEM DESCRIPTION

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 3-step control [HIGH/LOW/OFF].

JSBIA0321GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor
Camshaft position sensor

Engine speed

Piston position

Cooling fan speed request
signal

IPDM E/R

↓

Cooling fan relay

↓

Cooling fan motor

Engine coolant temperature sensor

Engine coolant temperature

Refrigerant pressure sensor

Refrigerant pressure

Battery

Battery voltage

Combination meter

Vehicle speed

BCM

A/C ON signal

Blower fan signal

EC-480

< SYSTEM DESCRIPTION >

[HR16DE]

SYSTEM

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays through CAN communication line.

EVAPORATIVE EMISSION SYSTEM

EVAPORATIVE EMISSION SYSTEM : System Diagram

INFOID:0000000006496230

JSBIA0117GB

Cooling fan speed

Cooling fan relay

Stop (OFF)

OFF

Low (LOW)

OFF

High (HI)

JSBIA0114GB

Juke F15 (2012 year). Service Repair Manual - part 141