Infiniti Q45. Manual - part 528

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

EC-751

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

NBS0026V

TBWM1253E

EC-752

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

29

PU

VIAS control solenoid valve

[Engine is running]

●

Selector lever: P or N

0 - 1.0V

[Engine is running]

●

Selector lever: D

●

Engine speed: Below 5,000 rpm

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

Engine speed: Above 5,000 rpm

0 - 1.0V

111

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]

●

For a few seconds after turning ignition 
switch OFF

0 - 1.5V

[Ignition switch: OFF]

●

More than a few seconds after turning igni-
tion switch OFF

BATTERY VOLTAGE
(11 - 14V)

119

120

R
R

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

EC-753

C

D

E

F

G

H

I

J

K

L

M

A

EC

Diagnostic Procedure

NBS0026W

1. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CON-
SULT-II.

3.

Turn VIAS control solenoid valve “ON” and “OFF”, and make
sure that power valve actuator rod moves.

 Without CONSULT-II

1.

Lift up the vehicle.

2.

Start engine and warm it up to normal operating temperature.

3.

Make sure that power valve actuator rod moves when changing
the selector lever position to N and D alternately.

OK or NG

OK

>> INSPECTION END

NG (With CONSULT-II)>>GO TO 2.
NG (Without CONSULT-II)>>GO TO 3.

PBIB0844E

PBIB2441E

PBIB2441E

EC-754

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

2. 

CHECK VACUUM EXISTENCE

 With CONSULT-II

1.

Stop engine and disconnect vacuum hose connected to power valve actuator.

2.

Start engine and let it idle.

3.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CON-
SULT-II.

4.

Turn VIAS control solenoid valve “ON” and “OFF”, and check
vacuum existence under the following conditions.

OK or NG

OK

>> Repair or replace power valve actuator.

NG

>> GO TO 4.

3. 

CHECK VACUUM EXISTENCE

 Without CONSULT-II

1.

Stop engine and disconnect vacuum hose connected to power valve actuator.

2.

Disconnect VIAS control solenoid valve harness connector.

3.

Start engine and let it idle.

4.

Apply 12V of direct current between VIAS control solenoid valve
terminals 1 and 2.

5.

Check vacuum existence under the following conditions.

OK or NG

OK

>> Repair or replace power valve actuator.

NG

>> GO TO 4.

4. 

CHECK VACUUM HOSE

1.

Stop engine.

2.

Check hoses and tubes between intake manifold and power
valve actuator for crack, clogging, improper connection or dis-
connection. Refer to 

EC-102, "Vacuum Hose Drawing"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair hoses or tubes.

5. 

CHECK VACUUM TANK

Refer to 

EC-756, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace vacuum tank.

VIAS SOL VALVE

Vacuum

ON

Should exist.

OFF

Should not exist.

PBIB0844E

Condition

Vacuum

12V direct current supply

Should exist.

No supply

Should not exist.

PBIB0845E

SEF109L