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 S/V-1" in "ACTIVE TEST" mode with CONSULT-III.





3. Turn VIAS control solenoid valve ON and OFF, and check that power valve actuator (1) rod moves.
Without CONSULT-III
1. Lift up the vehicle.
2. Start engine and warm it up to normal operating temperature.





3. Check that power valve actuator (1) rod moves when changing the selector lever position to the N and D alternately.
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 S/V-1" 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 (1) harness connector.
- : Vehicle front
3. Start engine and let it idle.





4. Apply 12 V 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
Component Tests and General Diagnostics.
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 (1) harness connector.
- : Vehicle front
3. Turn ignition switch ON.





4. Check voltage between VIAS control solenoid valve 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 E12, F3
- Harness continuity between IPDM E/R 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 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
Component Tests and General Diagnostics.
OK or NG
OK - GO TO 10.
NG - Replace VIAS control solenoid valve.
10.CHECK INTERMITTENT INCIDENT
Diagnosis Procedure.
- INSPECTION END