Nissan Altima L32. Instruction — part 246

TUMBLE CONTROL VALVE CONTROL

EC-105

< FUNCTION DIAGNOSIS >

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C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

TUMBLE CONTROL VALVE CONTROL

System Diagram

INFOID:0000000004349176

System Description

INFOID:0000000004349177

INPUT/OUTPUT SIGNAL CHART

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

SYSTEM DESCRIPTION

Tumble control valve has a valve portion in the intake passage of each cylinder.

While idling and during low engine coolant temperature, the tumble control valve closes. Thus the velocity of

the air in the intake passage increases, promoting the vaporization of the fuel and producing a tumble in the

combustion chamber.

Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel

consumption, and increase the stability in running conditions.

Also, except when idling and during low engine coolant temperature, this system opens the tumble control

valve.

In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow

resistance.

The tumble control valve is operated by the ECM.

JMBIA0162GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*

Tumble control
valve control

Tumble control valve motor

Camshaft position sensor (PHASE)

Battery

Battery voltage*

Engine coolant temperature sensor

Engine coolant temperature

Accelerator pedal position sensor

Accelerator pedal position

Tumble control valve position sensor

Tumble control valve position

EC-106

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TUMBLE CONTROL VALVE CONTROL

Component Parts Location

INFOID:0000000004349178

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. Tumble control valve actuator

14. EVAP service port

15. Electric throttle control actuator

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

16. EVAP canister purge volume control

solenoid valve

17. Fuel injector

18. Power steering pressure sensor

ALBIA0046ZZ

TUMBLE CONTROL VALVE CONTROL

EC-107

< FUNCTION DIAGNOSIS >

[QR25DE 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-108

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TUMBLE CONTROL VALVE CONTROL

JMBIA0118GB

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