Diagnosis Procedure

VIAS


Diagnosis Procedure

1.CHECK OVERALL FUNCTION
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CONSULT-III.





1 : Power valve actuator

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

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





1 : Power valve actuator

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-III) - GO TO 2.
NG (Without CONSULT-III) - GO TO 3.
2.CHECK VACUUM EXISTENCE
With CONSULT-III
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-III.
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-III
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. Refer to Diagrams.
OK or NG
OK - GO TO 5.
NG - Repair hoses or tubes.
5.CHECK VACUUM TANK
Refer to 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.

1 : Power valve actuator
2 : VIAS control solenoid valve
Arrow indicates Front

3. Turn ignition switch ON.





4. Check voltage between terminal 1 and ground with CONSULT-III 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
Refer to Component Inspection.
OK or NG
OK - GO TO 10.
NG - Replace VIAS control solenoid valve.
10.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
INSPECTION END