Variable Induction System: Testing and Inspection
VIAS Circuit Check
Diagnosis Procedure
1. CHECK OVERALL FUNCTION
With SDT
1 Start engine and warm it up to normal operating temperature.
2 Perform "VIAS S/V-1" in "Active test" mode with SDT.
3 Turn VIAS control solenoid valve "ON" and "OFF", and make sure that power valve actuator rod moves.
Without SDT
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 SDT)
GO TO 2.
NG (Without SDT)
ERROR! Unknown action!GO TO 3.
2. CHECK VACUUM EXISTENCE
With SDT
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 SDT.
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 SDT
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 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. Refer to [Variable Induction Air System: Vacuum Hose Drawing] [1][2]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. Refer to [Intake Manifold Collector: Exploded View] Intake Manifold Collector 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 SDT or tester.
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.
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. Refer to [Intake Manifold Collector: Exploded View] Intake Manifold Collector Exploded View.
10. CHECK INTERMITTENT INCIDENT
Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.
INSPECTION END
Component Inspection
VIAS Control Solenoid Valve
With SDT
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 SDT
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).