Qashqai J11. Engine control system (MR20DD)

COMPONENT PARTS

ECM-19

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Electric throttle control actuator consists of throttle body, throttle valve, throttle control motor and throttle posi-
tion sensor.

THROTTLE CONTROL MOTOR RELAY

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.

THROTTLE CONTROL MOTOR

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.

THROTTLE POSITION SENSOR

The throttle position sensor has two sensors. These sensors are a
kind of potentiometers which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. In addition,
these sensors detect the opening and closing speed of the throttle
valve and feed the voltage signals to the ECM. The ECM judges the
current opening angle of the throttle valve from these signals and the
ECM controls the throttle control motor to make the throttle valve
opening angle properly in response to driving condition.

Ignition Coil With Power Transistor

INFOID:0000000010702788

Ignition coil with power transistor

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.

JSBIA0270GB

PBIB0145E

JPBIA4613ZZ

ECM-20

< SYSTEM DESCRIPTION >

[MR20DD]

COMPONENT PARTS

Fuel Injector

INFOID:0000000010702789

For the fuel injector, a high pressure fuel injector is used and this
enables a high-pressure fuel injection at a high voltage within a short
time. The ECM is equipped with an injector driver unit and actuates
the fuel injector at a high voltage (approximately 65 V at the maxi-
mum).

High Pressure Fuel Pump

INFOID:0000000010702790

• Balanced flow volume control type single cylinder high pressure fuel pump, which approximately equalize

the amount of injection and pump output, is adopted.

• The high pressure fuel pump is activated by the exhaust camshaft. ECM controls the high pressure fuel

pump control solenoid valve built into the high pressure fuel pump and adjusts the amount of discharge by
changing the suction timing of the low pressure fuel.

- Inflow process: Cam driven lowering plunger let the fuel from low pressure fuel pump induced into high pres-

sure fuel pump.

- Spill process: Although the cam driven plunger start moving upward, inflow check valve still at open position

due to the control solenoid valve, so the fuel is not pressurized and spilled out to low pressure fuel pump
side. By changing the amount of this spill out volume changes the amount of injection.

- Outflow process: When the control solenoid valve turns ON, the inflow check valve is closed, fuel is pressur-

ized and when the pressure exceeds certain point discharge check valve is pushed open to discharge fuel
into fuel rail.

Operating Description

JPBIA4982ZZ

JSBIA0285GB

COMPONENT PARTS

ECM-21

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Operating Chart

Fuel Rail Pressure Sensor

INFOID:0000000010702791

The fuel rail pressure (FRP) sensor is placed to the fuel rail and
measures fuel pressure in the fuel rail. The sensor transmits voltage-
signal to the ECM. As the pressure increases, the voltage rises. The
ECM controls the fuel pressure in the fuel rail by operating high pres-
sure fuel pump. The ECM uses the signal from fuel rail pressure sen-
sor as a feedback signal.

Low Pressure Fuel Pump

INFOID:0000000010702792

The low pressure fuel pump is integrated with a fuel pressure
regulator and a fuel filter. This pump is build into the fuel tank.

Mass Air Flow Sensor (With Intake Air Temperature Sensor)

INFOID:0000000010702793

MASS AIR FLOW SENSOR

JSBIA0286GB

JSBIA0291ZZ

JSBIA4496ZZ

ECM-22

< SYSTEM DESCRIPTION >

[MR20DD]

COMPONENT PARTS

The mass air flow sensor

is placed in the stream of intake air. It

measures the intake flow rate by measuring a part of the entire
intake flow. The MAF sensor controls the temperature of the heater
in sensing element to a certain amount. The temperature distribution
around the heater changes according to the increase in intake air
volume. The change is detected by a thermistor and the air volume
data is sent to ECM by the MAF sensor.

INTAKE AIR TEMPERATURE SENSOR

The intake air temperature sensor is built-into mass air flow sensor. 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.
<Reference data>

*: These data are reference values on the diagnosis tool.

Engine Coolant Temperature Sensor

INFOID:0000000010702794

The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

*: These data are reference values and are measured between ECM terminals.

PBIA9559J

Intake air temperature

[

C (

F)]

Voltage

(V)

Resistance (k

Ω

)

25 (77)

3.3

1.80 - 2.20

80 (176)

1.2

0.28 - 0.36

SEF012P

JPBIA5280ZZ

Engine coolant tem-

perature

[

C (

F)]

Voltage

(V)

Resistance (k

Ω

)

−

10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.37 - 2.63

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

SEF012P

COMPONENT PARTS

ECM-23

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Crankshaft Position Sensor

INFOID:0000000010702795

The crankshaft position sensor (POS) is located on the Cylinder
block rear end. It detects the fluctuation of the engine revolution.
The sensor consists of a permanent magnet and Hall IC. When the
engine is running, the high and low parts of the teeth cause the gap
with the sensor to change. The changing gap causes the magnetic
field near the sensor to change. Due to the changing magnetic field,
the voltage from the sensor changes. The ECM receives the voltage
signal and detects the fluctuation of the engine revolution.

Camshaft Position Sensor

INFOID:0000000010702796

The camshaft position sensor (PHASE) senses the retraction of
intake camshaft to identify a particular cylinder. The camshaft posi-
tion sensor (PHASE) senses the piston position.
When the crankshaft position sensor (POS) system becomes inoper-
ative, the camshaft position sensor (PHASE) provides various con-
trols of engine parts instead, utilizing timing of cylinder identification
signals. The sensor consists of a permanent magnet and Hall IC.
When engine is running, the high and low parts of the teeth cause
the gap with the sensor to change. The changing gap causes the
magnetic field near the sensor to change. Due to the changing mag-
netic field, the voltage from the sensor changes.

Intake Valve Timing Control Solenoid Valve

INFOID:0000000010702797

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.

Exhaust Valve Timing Control Position Sensor

INFOID:0000000010702798

Exhaust valve timing control position sensor detects the protrusion of
the signal plate installed to the exhaust camshaft rear end.
This sensor signal is used for sensing a position of the exhaust cam-
shaft.
The sensor consists of a permanent magnet and Hall IC.
When engine is running, the high and low parts of the teeth cause
the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor
changes.

JMBIA0062ZZ

JMBIA0064ZZ

JPBIA5281ZZ

JMBIA0064ZZ

ECM-24

< SYSTEM DESCRIPTION >

[MR20DD]

COMPONENT PARTS

Exhaust Valve Timing Control Solenoid Valve

INFOID:0000000010702799

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

Intake Manifold Runner Control Valve

INFOID:0000000010702800

Intake manifold runner control valve is consist of intake manifold run-
ner control valve to open/close the right/left half section installed at
each port of intake manifold runner control valve motor to drive open/
close the valve.
ECM transmits the open/close signal to intake manifold runner con-
trol valve motor according to the driving condition based on the sig-
nals of engine speed, coolant temperature etc. ECM stabilizes
combustion by causing strong swirl flow (revolving flow) by closing
the intake manifold runner control valve.

Air Fuel Ratio (A/F) Sensor 1

INFOID:0000000010702801

Description

The A/F sensor 1 is mounted on the exhaust manifold, and transmits
the signal of detected oxygen concentration in the exhaust gas to
ECM.
While O2 sensor changes output voltage by ON/OFF (rich/lean)
mode within a narrow range of the stoichiometric ratio, the A/F sen-
sor changes output voltage between 0 - 4 V for a wide range of air
fuel ratio.
ECM judges the state of air fuel ratio with this signal, and precisely
controls air fuel ratio to match the stoichiometric ratio.Also, the sen-
sor is equiped with heater for maintaining the activated state.

A/F SENSOR 1 HEATER

A/F sensor 1 heater is integrated in the sensor.
The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating
condition to keep the temperature of A/F sensor 1 element within the specified range.

JPBIA5281ZZ

JPBIA5277ZZ

JPBIA4038GB

PBIB3354E

COMPONENT PARTS

ECM-25

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Heated Oxygen Sensor 2

INFOID:0000000010702802

DESCRIPTION

The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.

HEATED OXYGEN SENSOR 2 HEATER

Heated oxygen sensor 2 heater is integrated in the sensor.
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

Barometric Pressure Sensor

INFOID:0000000010702803

The barometric pressure sensor is attached to the battery tray 2.
It detects barometric pressure and sends the voltage signal to the
ECM. The sensor uses a silicon diaphragm which is sensitive to the
change in pressure. As the pressure increases, the voltage rises.

Knock Sensor

INFOID:0000000010702804

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.

SEF288D

Engine speed

Heated oxygen sensor 2 heater

Above 3,200 rpm

OFF

Below 3,200 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

JSBIA4556ZZ

JSBIA0284ZZ

ECM-26

< SYSTEM DESCRIPTION >

[MR20DD]

COMPONENT PARTS

Engine Oil Pressure Sensor

INFOID:0000000010702805

The engine oil pressure (EOP) sensor is detects engine oil pressure
and transmits a voltage signal to the ECM.

Engine Oil Temperature Sensor

INFOID:0000000010702806

The engine oil temperature sensor is used to detect the engine oil
temperature. The sensor modifies a voltage signal from the ECM.
The modified signal returns to the ECM as the engine oil tempera-
ture input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.

<Reference data>

*: These data are reference values and are measured between ECM terminals.

Cooling Fan

INFOID:0000000010702807

The ECM controls the cooling fan speed corresponding to the vehicle speed, engine coolant temperature, and
cooling fan request signal from A/C auto amp. The cooling fan is consisted of cooling fan motor, which drives
cooling fan, and cooling fan relay which energizes cooling fan motor.

Cooling Fan Resistor

INFOID:0000000010714660

Cooling Fan Resister is installed to the power circuit of Cooling Fan Motor and switches cooling fan speed
between LOW and HIGH.
When Cooling Fan Motor is rotated at LOW speeds, power is supplied to the cooling fan via Cooling Fan
Resistor.

JSBIA0292ZZ

JPBIA5280ZZ

Engine oil temperature

[

C (

F)]

Voltage

(V)

Resistance (k

Ω

)

–10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.37 - 2.63

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

110 (230)

0.6

0.143 - 0.153

SEF012P

COMPONENT PARTS

ECM-27

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

EVAP Canister Purge Volume Control Solenoid Valve

INFOID:0000000010702808

The EVAP canister purge volume control solenoid valve uses a ON/
OFF duty to control the flow rate of fuel vapor from the EVAP canis-
ter. The EVAP canister purge volume control solenoid valve is
moved by ON/OFF pulses from the ECM. The longer the ON pulse,
the greater the amount of fuel vapor that will flow through the valve.

Refrigerant Pressure Sensor

INFOID:0000000010702809

The refrigerant pressure sensor is installed at the liquid tank 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 and Brake pedal position switch

INFOID:0000000010702810

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

Clutch Pedal Position Switch

INFOID:0000000010702811

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

Clutch Interlock Switch

INFOID:0000000010713262

When the clutch pedal is depressed, the clutch interlock switch turns ON and the clutch interlock switch signal
is sent to the ECM. The ECM judges the clutch pedal conditions via the signal (ON or OFF).

JSBIA0651ZZ

JSBIA5008GB

Brake pedal

Brake pedal position switch

Stop lamp switch

Released

OFF

Depressed

OFF

Clutch pedal

Clutch pedal position switch

Released

Depressed

OFF

Clutch pedal

Clutch interlock switch

Released

OFF

Depressed

SYSTEM

ECM-31

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

• The adopted system enables comprehensive engine control. ECM (engine control module) performs various

controls such as fuel injection control, ignition timing control, idling engine speed control, EVAP purge con-
trol and etc., and this system communicates with control unit such as CVT, ABS, etc. via CAN communica-
tion line.

• The adopted diagnostic system corresponding to OBD (on board diagnostic) system enables various func-

tion check and easily malfunction diagnosis in the engine control system.

ENGINE CONTROL SYSTEM : Fail-safe

INFOID:0000000010702816

NON DTC RELATED ITEM

DTC RELATED ITEM

Description

Function

Reference

Fuel injection control

ECM-35, "DIG (DIRECT INJECTION GASOLINE) SYSTEM :
System Description"

Fuel pressure control

ECM-38, "FUEL PRESSURE CONTROL : System Descrip-
tion"

Electric ignition control

ECM-39, "ELECTRIC IGNITION SYSTEM : System Descrip-
tion"

Idling control

ECM-40, "IDLE SPEED CONTROL : System Description"

Cooling fan control

ECM-41, "COOLING FAN CONTROL : System Description"

Intake valve timing control

ECM-42, "INTAKE VALVE TIMING CONTROL : System De-
scription"

Exhaust valve timing control

ECM-43, "EXHAUST VALVE TIMING CONTROL : System
Description"

Intake manifold runner control valve control

ECM-45, "INTAKE MANIFOLD RUNNER CONTROL : Sys-
tem Description"

Engine protection control (Low engine oil pressure)

ECM-46, "ENGINE PROTECTION CONTROL AT LOW EN-
GINE OIL PRESSURE : System Description"

Air conditioning cut control

ECM-47, "AIR CONDITIONING CUT CONTROL : System De-
scription"

ASCD (Automatic speed control device)

ECM-48, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)
: System Description"

ECO mode control

ECM-50, "ECO MODE SYSTEM : System Description"

Engine/CVT/ABS total control

ECM-50, "INTEGRATED CONTROL OF ENGINE, CVT, AND
ABS : System Description"

EVAP purge control

ECM-51, "EVAPORATIVE EMISSION SYSTEM : System De-
scription"

Power generation voltage variable control

ECM-51, "POWER GENERATION VOLTAGE VARIABLE
CONTROL SYSTEM : System Description"

Fail-safe function

ECM-87, "Fail-safe"

On board diagnostic (OBD) system

ECM-55, "Diagnosis Description"

Detected

items

Engine operating condition in

fail-safe mode

Remarks

Malfunction
indicator lamp
circuit

Engine speed will not rise more
than 2,500 rpm due to the fuel
cut

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by
lighting up MIL when there is malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are
continuously detected as NG for 5 trips, ECM warns the driver that engine control
system malfunctions and MIL circuit is open by means of operating fail safe func-
tion.
The fail safe function also operates when above diagnoses except MIL circuit are
detected and demands the driver to repair the malfunction.

ECM-32

< SYSTEM DESCRIPTION >

[MR20DD]

SYSTEM

When a DTC is detected, ECM executes a mode (in the Fail-safe mode) applicable to the DTC. The fail-safe
mode has the preset traveling control mode (accelerator angle variation and engine output limit), device fix
mode and combustion control mode.

Fail Safe Pattern

Fail Safe List

:Applicable —: Not applicable

Fail safe mode

Vehicle behavior

Traveling con-
trol mode

Accelerator an-
gle variation
control

ECM controls the accelerator pedal depression speed to make it slower than actual speed. This
causes a drop in accelerating performance and encourages the driver to repair malfunction.
NOTE:
ECM does not control the accelerator pedal releasing speed.

Engine output
control

ECM reduces the engine output, according to the rise in engine speed. This reduces the vehicle
speed to encourage the driver to repair malfunction.

Device fix mode

• This mode fixes the IVT control solenoid valve and the EVT control solenoid valve in the refer-

ence position.

• The intake manifold runner control valve motor is turned OFF (intake manifold runner control

valve opens).

Combustion
control mode

Stratified charge
combustion
control at start-
ing

No stratified charge combustion at starting (cold start).

Idle speed con-
trol

Stops feedback control of idle speed and controls with specified speed.

Recovery speed
control at decel-
erating

Stops recovery speed control by the fuel cut at decelerating and controls with specified speed.

Idle neutral con-
trol

Stops idle neutral control.

Ignition timing
correction con-
trol

Partially controls ignition timing control.

Retardation
control

Controls ignition timing delay control in the intermediate water temperature range.

Pattern

Fail safe mode

Traveling control mode

Accelerator angle variation control

Engine output control

Device fix mode

Combustion control mode

Stratified charge combustion control at starting

• Idle speed control
• Recovery speed control at decelerating
• Idle neutral control

• Ignition timing correction control
• Retardation control

DTC No.

Detected items

Vehicle behavior

Pattern

Others

P0011

Intake valve timing control

—

P0014

Exhaust valve timing control

—

P0075

Intake valve timing control sole-
noid valve

—

P0078

Exhaust valve timing control so-
lenoid valve

—

SYSTEM

ECM-33

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

P0087
P0088
P0090

FRP control system

—

P0102
P0103

Mass air flow sensor circuit

—

P0117
P0118

Engine coolant temperature
sensor circuit

—

Engine speed will not rise more than
1,800rpm due to the fuel cut.

P0122
P0123
P0222
P0223
P2135

Throttle position sensor

—

The ECM controls the electric throttle con-
trol actuator in regulating the throttle open-
ing in order for the idle position to be within
+10 degrees.
The ECM regulates the opening speed of
the throttle valve to be slower than the nor-
mal condition. So, the acceleration will be
poor.
NOTE:
If throttle position sensor 1 and 2 malfunc-
tion at the same time conducts following
control.
• ECM stops the electric throttle control ac-

tuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by
the return spring.

P0171
P0172

Fuel injection system

—

P0190

FRP sensor

—

P0197
P0198

Engine oil temperature sensor

—

Intake and exhaust valve timing control
does not function.

P0201
P0202
P0203
P0204

Injector

—

P0300

Misfire

—

P0335

Crankshaft position sensor

—

P0340

Camshaft position sensor

—

P0365

Exhaust valve timing control po-
sition sensor

—

P0500

Vehicle speed sensor

—

P0524

Engine oil pressure

—

• ECM illuminates engine oil pressure

warning lamp on the combination meter.

• Engine speed will not rise more than

4,000rpm due to the fuel cut.

• Fail-safe is canceled when ignition switch

OFF

→

ON.

P0603
P0607

ECM

—

P0604
P0605
P0606

—

(Computing part of ECM does not operate
normally.)
ECM stops the electric throttle control actu-
ator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the re-
turn spring.

P062B

—

NOTE:
Fail-safe mode may not start depending on
malfunction type of ECM.

DTC No.

Detected items

Vehicle behavior

Pattern

Others

Qashqai J11. Engine control system (MR20DD) - part 2