Nissan Qashqai (2007-2010). Manual - part 130

ENGINE CONTROL SYSTEM

EC-39

< FUNCTION DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

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Component Description

INFOID:0000000001056132

1.

ASCD steering switch

2.

CANSEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

MAIN switch

JMBIA0349ZZ

Component

Reference

Accelerator pedal position sensor

EC-280, "Description"

ASCD brake switch

EC-294, "Description"

ASCD steering switch

EC-263, "Description"

ASCD vehicle speed sensor

EC-272, "Description"

Camshaft position sensor (PHASE)

EC-197, "Description"

Crankshaft position sensor (POS)

EC-193, "Description"

Cooling fan motor

EC-299, "Description"

Electric throttle control actuator

EC-217, "Description"

Engine coolant temperature sensor

EC-135, "Description"

Fuel injector

EC-303, "Description"

Fuel pump

EC-306, "Description"

Heated oxygen sensor 1

EC-141, "Description"

Heated oxygen sensor 1 heater

EC-156, "Description"

Heated oxygen sensor 2

EC-159, "Description"

Heated oxygen sensor 2 heater

EC-171, "Description"

Ignition signal

EC-309, "Description"

Intake air temperature sensor

EC-132, "Description"

Intake valve timing control solenoid valve

EC-215, "Description"

Knock sensor

EC-191, "Description"

Mass air flow sensor

EC-127, "Description"

Park/neutral position switch

EC-274, "Description"

PCV valve

EC-315, "Description"

Refrigerant pressure sensor

EC-316, "Description"

Stop lamp switch

EC-277, "Description"

Throttle control motor

EC-226, "Description"

Throttle control motor relay

EC-223, "Description"

Throttle position sensor

EC-138, "Description"

Vehicle speed sensor

EC-209, "Description"

EC-40

< FUNCTION DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

MULTIPORT FUEL INJECTION SYSTEM

MULTIPORT FUEL INJECTION SYSTEM

System Diagram

INFOID:0000000001056133

System Description

INFOID:0000000001056134

INPUT/OUTPUT SIGNAL CHART

*1: This sensor is not used to control the engine system under normal conditions.

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

*3: ECM determines the start signal status by the signals of engine speed and battery voltage.

JMBIA0408GB

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*

3

Piston position

Fuel injection 
& mixture ratio 
control

Fuel injector

Camshaft position sensor (PHASE)

Mass air flow sensor

Amount of intake air

Intake air temperature sensor

Intake air temperature

Engine coolant temperature sensor

Engine coolant temperature

Heated oxygen 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

Gear position

Battery

Battery voltage*

3

Knock sensor

Engine knocking condition

EPS control unit

Power steering operation

Heated oxygen sensor 2*

1

Density of oxygen in exhaust gas

BCM*

2

Air conditioner operation

Combination meter*

2

Vehicle speed

MULTIPORT FUEL INJECTION SYSTEM

EC-41

< FUNCTION DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

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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 (POS), camshaft position
sensor (PHASE) 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.

<Fuel increase>

• During warm-up
• When starting the engine
• During acceleration
• Hot-engine operation
• High-load, high-speed operation

<Fuel decrease>

• During deceleration
• During high engine speed operation

MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)

The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This system uses
heated oxygen sensor 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
heated oxygen sensor 1, refer to 

EC-141, "DTC Logic"

. 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 heated oxygen 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 heated oxygen sensor 1 or its circuit
- Insufficient activation of heated sensor 1 at low engine coolant temperature
- High engine coolant temperature
- During warm-up
- When starting the engine

MIXTURE RATIO SELF-LEARNING CONTROL

The mixture ratio feedback control system monitors the mixture ratio signal transmitted from heated oxygen
sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to
the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as orig-
inally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic
changes during 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.

PBIB2953E

EC-42

< FUNCTION DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

MULTIPORT FUEL INJECTION SYSTEM

“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 heated oxygen sensor 1 indicates whether the mixture ratio is RICH or LEAN compared
to the theoretical 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 differences,
wear over time and changes in the usage environment.

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.

Component Parts Location

INFOID:0000000001060009

SEF337W