Nissan Altima L32. Instruction — part 378

INTAKE VALVE TIMING CONTROL

EC-633

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

INTAKE VALVE TIMING CONTROL

System Diagram

INFOID:0000000004349629

System Description

INFOID:0000000004349630

INPUT/OUTPUT SIGNAL CHART

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

SYSTEM DESCRIPTION

This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake

valve.

The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant

temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control sole-

noid valve depending on driving status. This makes it possible to control the shut/open timing of the intake

valve to increase engine torque in low/mid speed range and output in high-speed range.

JMBIA0060GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed and piston position

Intake valve
timing control

Intake valve timing control
solenoid valve

Camshaft position sensor (PHASE)

Engine coolant temperature sensor

Engine coolant temperature

Combination meter

Vehicle speed*

EC-634

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

INTAKE VALVE TIMING CONTROL

Component Parts Location

INFOID:0000000004349631

1.

Intake valve timing control solenoid
valve

2.

Ignition coil (with power transistor)
and spark plug

3.

Knock sensor,
Crankshaft position sensor (POS)

4.

Air fuel ratio (A/F) sensor 1

5.

Camshaft position sensor (PHASE)

6.

Engine coolant temperature sensor

7.

Park/neutral position (PNP) switch

8.

ECM

9.

Refrigerant pressure sensor

10. Battery current sensor

11. IPDM E/R

12. Mass air flow sensor (with intake

temperature sensor)

13. EVAP service port

14. Electric throttle control actuator

(with built in throttle position sensor
and throttle control motor)

15. EVAP canister purge volume control

solenoid valve

16. Fuel injector

17. Power steering pressure sensor

ALBIA0094ZZ

INTAKE VALVE TIMING CONTROL

EC-635

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

1.

Battery

2.

Fuel pump fuse (15A)

3.

IPDM E/R

4.

Brake master cylinder

5.

Engine ground

6.

Air cleaner assembly

7.

Mass air flow sensor (with intake air
temperature sensor)

8.

Radiator hose (upper)

9.

Engine coolant temperature sensor

10. Intake air duct

11. Camshaft position sensor (PHASE)

12. Tie rod (RH)

13. Power steering pressure sensor

14. Knock sensor

15. Engine oil cooler

16. Crankshaft position sensor (POS)

17. Drive shaft (RH)

: Vehicle front

ALBIA0091ZZ

EC-636

< FUNCTION DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

INTAKE VALVE TIMING CONTROL

BBIA0296E

1.

Exhaust manifold cover

2.

Air fuel ratio (A/F) sensor 1

3.

Heated oxygen sensor 2
(This illustration is a view from under
vehicle.)

4.

Engine oil pan

: Vehicle front

ALBIA0068ZZ