VIAS

VIAS

Diagnosis Procedure


1. CHECK OVERALL FUNCTION

With CONSULT
1.Start engine and warm it up to normal operating temperature.
2.Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.





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





Without CONSULT
1.Start engine and warm it up to normal operating temperature.





2.Rev engine up to between 2,200 and 3,300 rpm and make sure that power valve actuator rod moves.





OK or NG
OK-INSPECTION END
NG (With CONSULT) -GO TO 2.
NG (Without CONSULT) -GO TO 3.

2. CHECK VACUUM EXISTENCE

With CONSULT
1.Stop engine and disconnect vacuum hose connected to power valve actuator.
2.Start engine and let it idle.
3.Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.
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
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 cracks, clogging, improper connection or disconnection. Diagrams.
OK or NG
OK- GO TO 5.
NG- Repair hoses or tubes.

5. CHECK VACUUM TANK

.
OK or NG
OK- GO TO 6.
NG- Replace vacuum tank. Exploded View.

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 terminal 1 and ground with CONSULT
or tester.
Voltage: Battery voltage
OK or NG
OK- GO TO 8.
NG- GO TO 7.

7. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors E2, F32
- Harness for open or short between VIAS control solenoid valve and IPDM E/R
- Harness for open or short between VIAS control solenoid valve and ECM
- Repair 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 29 and VIAS control solenoid valve terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
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

.
OK or NG
OK- GO TO 10.
NG- Replace VIAS control solenoid valve. Exploded View.

10. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
-INSPECTION END


Component Inspection


VIAS CONTROL SOLENOID VALVE

With CONSULT
1.Reconnect harness connectors disconnected.
2.Turn ignition switch ON.
3.Perform "VIAS S/V-1" in "ACTIVE TEST" mode.





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





Operation takes less than 1 second.
Without CONSULT





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