Nissan Rogue. Manual - part 442

EC-36

< SYSTEM DESCRIPTION >

[QR25DE]

SYSTEM

P0171
P0172

Fuel injection system

×

—

—

—

P0197
P0198

Engine oil temperature sensor

—

—

—

Exhaust valve timing control does not function.

P0300
P0301
P0302
P0303
P0304

Misfire

×

—

—

—

P0500

Vehicle speed sensor

×

—

—

—

P050A

Cold start control

—

—

—

—

P0524

Engine oil pressure

—

—

—

• ECM illuminates oil pressure warning lamp on the combina-

tion meter.

• Engine speed will not rise more than 4,000rpm due to the 

fuel cut.

• Fail-safe is canceled when ignition switch OFF 

→ ON.

P052A
P052B

Intake valve timing intermedi-
ate lock control

—

—

×

—

P0603

ECM

—

—

—

—

—

×

—

ASCD operation may be deactivated.

P0604

ECM

×

—

×

ASCD operation may be deactivated.

P0605
P060B

ECM

—

—

—

—

×

—

×

ASCD operation may be deactivated.

P0606

ECM

—

—

—

ASCD operation may be deactivated.

×

—

×

ASCD operation may be deactivated.

P0607

ECM

—

—

—

—

—

×

—

—

P060A

ECM

×

—

×

—

×

×

×

ASCD operation may be deactivated.

P0643

ECM

×

—

×

—

P1078

Exhaust valve timing control 
position sensor circuit

×

—

×

—

P1568

Signal invalid

—

—

—

Active trace control does not function.

P1805

Brake switch

—

—

—

ECM controls the electric throttle control actuator by regulat-
ing the throttle opening to a small range.
Therefore, acceleration will be poor.

Vehicle condition

Driving condition

When engine is idling

Normal

When accelerating

Poor acceleration

P2004

Intake manifold runner control 
valve

—

×

×

—

P2100
P2103

Throttle control motor relay

—

—

—

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

P2101

Electric throttle control func-
tion

—

—

—

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

DTC 

No.

Detected items

Vehicle behavior

Pattern

Others

A

B

C

SYSTEM

EC-37

< SYSTEM DESCRIPTION >

[QR25DE]

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MULTIPORT FUEL INJECTION SYSTEM
MULTIPORT FUEL INJECTION SYSTEM : System Description (with automatic air 
conditioner)

INFOID:0000000011277854

SYSTEM DIAGRAM

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

P2118

Throttle control motor

—

—

—

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

P2119

Electric throttle control actua-
tor

—

×

—

—

P2122
P2123
P2127
P2128
P2138

Accelerator pedal position 
sensor

—

—

—

The ECM controls the electric throttle control actuator in reg-
ulating the throttle opening 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 normal condition.
So, the acceleration will be poor. 

DTC 

No.

Detected items

Vehicle behavior

Pattern

Others

A

B

C

JPBIA5978GB

EC-38

< SYSTEM DESCRIPTION >

[QR25DE]

SYSTEM

• When starting the engine

• During acceleration

• Hot-engine operation

• When selector lever is changed from N to D

• 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 A/F

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 A/F sensor 1, refer to

EC-24, "Air Fuel Ratio (A/F) 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 A/F sensor 1 at low engine coolant temperature

- High engine coolant temperature

- During warm-up

- After shifting from N to D

- 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 differences,

wear over time and changes in the usage environment.

PBIB2793E

SYSTEM

EC-39

< SYSTEM DESCRIPTION >

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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.

MULTIPORT FUEL INJECTION SYSTEM : System Description (with manual air con-
ditioner)

INFOID:0000000011277855

SYSTEM DIAGRAM

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

SEF337W

JPBIA6221GB