Nissan Frontier D40. Manual - part 335

ENGINE CONTROL SYSTEM

EC-31

< FUNCTION DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

BBIA0611E

EC-32

< FUNCTION DIAGNOSIS >

[QR25DE]

ENGINE CONTROL SYSTEM

ALBIA0515ZZ

1.

EVAP canister vent control valve 
(view with bed removed)

2.

EVAP control system pressure 
sensor

3.

Drain filter

4.

EVAP canister

5.

Intake manifold collector
 (view with air cleaner case removed)

6.

Power steering pressure sensor

7.

ASCD brake switch (view with lower 
instrument panel LH removed)

8.

Stop lamp switch

9.

Brake pedal

10.

Electric throttle control actuator 
(view with intake air duct removed)

11.

Throttle valve

12. ASCD steering switch

13. CANCEL switch

14. ON OFF (main) switch

15. SET/COAST switch

16. ACCEL/RES switch

17. ASCD clutch switch

18. Clutch pedal

Front

ENGINE CONTROL SYSTEM

EC-33

< FUNCTION DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

BBIA0640E

EC-34

< FUNCTION DIAGNOSIS >

[QR25DE]

MULTIPORT FUEL INJECTION SYSTEM

MULTIPORT FUEL INJECTION SYSTEM

System Description

INFOID:0000000005273028

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 signal of engine speed and battery voltage.

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 both the crankshaft position sensor 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
• When selector lever is changed from N to D (A/T models)
• High-load, high-speed operation

<Fuel decrease>

• During deceleration
• During high engine speed operation

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*

3

Fuel injection & mixture 
ratio control

Fuel injector

Camshaft position sensor (PHASE)

Piston position

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 (M/T)
TCM (A/T)

Gear position

Knock sensor

Engine knocking condition

Power steering pressure sensor

Power steering operation

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas

Heated oxygen sensor 2*

1

Density of oxygen in exhaust gas

Combination meter

Vehicle speed*

2

Air conditioner switch

Air conditioner operation*

2

Battery

Battery voltage*

3