Infiniti M45 (Y34). Manual - part 489

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

EC-645

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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 CONSULT-II.

4.

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

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.

VIAS SOL VALVE

Vacuum

ON

Should exist.

OFF

Should not exist.

PBIB0174E

Condition

Vacuum

12V direct current supply

Should exist.

No supply

Should not exist.

PBIB0175E

EC-646

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

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-24, "Vacuum Hose Drawing"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair hoses or tubes.

5. 

CHECK VACUUM TANK

Refer to 

EC-647, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace vacuum tank.

6. 

CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect VIAS control solenoid valve harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between VIAS control solenoid valve terminal 1
and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

SEF109L

PBIB0035E

Voltage: Battery voltage

PBIB0173E

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

EC-647

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7. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E33, F33

●

Fuse, fusible link and relay block (J/B) connector E3

●

10A fuse

●

Harness continuity between fuse and VIAS control solenoid valve

>> Repair open circuit or short to ground or short to power in harness or connectors.

8. 

CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 27 and terminal 2.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 9.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

9. 

CHECK VIAS CONTROL SOLENOID VALVE

Refer to 

EC-647, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Replace VIAS control solenoid valve.

10. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002TJ

VIAS CONTROL SOLENOID VALVE

 With CONSULT-II

1.

Reconnect harness connectors disconnected.

2.

Turn ignition switch ON.

3.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode.

4.

Check air passage continuity and operation delay time under the
following conditions.

Operation takes less than 1 second.

Continuity should exist.

Condition

VIAS SOL VALVE

Air passage continuity 

between A and B

Air passage continuity 

between A and C

ON

Yes

No

OFF

No

Yes

PBIB0177E

EC-648

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

 With GST

Check air passage continuity and operation delay time under the fol-
lowing conditions.

Operation takes less than 1 second.

VACUUM TANK

1.

Disconnect vacuum hose connected to vacuum tank.

2.

Connect a vacuum pump to the port A of vacuum tank.

3.

Apply vacuum and make sure that vacuum exists at the port B.

Removal and Installation

ABS002TK

VIAS CONTROL SOLENOID VALVE

Refer to 

EM-18, "INTAKE MANIFOLD"

 .

Condition

Air passage continuity 

between A and B

Air passage continuity 

between A and C

12V direct current supply 
between terminals 1 and 2

Yes

No

No supply

No

Yes

MEC488B

PBIB0846E