VARIABLE INDUCTION AIR SYSTEM

Description

Power Valves 1 and 2
The power valves 1 and 2 are installed in intake manifold collector and used to control the suction passage of the variable induction air control system. They are set in the fully closed or fully opened position by the power valve actuators 1 and 2 operated by the vacuum stored in the vacuum tank. The vacuum to power valve actuators is controlled by the VIAS control solenoid valves 1 and 2.

VARIABLE INDUCTION AIR SYSTEM

Diagnosis Procedure

1.Inspection START
Confirm the malfunctioning system (power valve 1 or power valve 2). Refer to See: Component Function Check.
Which system is related to the incident?
Power valve 1>>GO TO 2.
Power valve 2>>GO TO 6.
2.CHECK VACUUM EXISTENCE-I
With CONSULT-III

1. Stop engine and disconnect vacuum hose connected to power valve actuator 1.
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 1 ON and OFF, and check vacuum existence under the following conditions.

1. Stop engine and disconnect vacuum hose connected to power valve actuator 1.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Start engine.
4. Rev engine quickly up to approximately 5,000 rpm.
5. Check vacuum existence under the following conditions.

1. Stop engine and disconnect vacuum hose connected to intake manifold collector.
2. Start engine and let it idle.
3. Check vacuum existence from intake manifold collector. Does vacuum existence from the intake manifold collector?

YES >> GO TO 4.
NO >> Replace intake manifold collector.
4.CHECK VACUUM HOSE

1. Stop engine.

2. Check vacuum hose for cracks, clogging, improper connection or disconnection. Refer to See: Fuel Delivery and Air Induction\Variable Induction System\Description and Operation\System Diagram. Is the Inspection result normal?

YES >> GO TO 5.
NO >> Repair hoses or tubes.
5.CHECK VIAS CONTROL SOLENOID VALVE 1
Refer to See: A L L Diagnostic Trouble Codes ( DTC )\Testing and Inspection\P Code Charts\P1800.
Is the Inspection result normal?
YES >> GO TO 9.
NO >> Replace VIAS control solenoid valve 1.
6.CHECK VACUUM EXISTENCE-II
With CONSULT-III

1. Stop engine and disconnect vacuum hose connected to power valve actuator 2.
2. Start engine and let it idle.
3. Perform "VIAS S/V-2" in "ACTIVE TEST" mode with CONSULT-III.
4. Turn VIAS control solenoid valve 2 ON and OFF, and check vacuum existence under the following conditions.

1. Stop engine and disconnect vacuum hose connected to power valve actuator 2.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Start engine.
4. Rev engine quickly up to approximately 5,000 rpm.
5. Check vacuum existence under the following conditions.

1. Stop engine.

2. Check vacuum hose for cracks, clogging, improper connection or disconnection. Refer to See: Fuel Delivery and Air Induction\Variable Induction System\Description and Operation\System Diagram. Is the Inspection result normal?

YES >> GO TO 8.
NO >> Repair hoses or tubes.
8.CHECK VIAS CONTROL SOLENOID VALVE 2
Refer to See: A L L Diagnostic Trouble Codes ( DTC )\Testing and Inspection\P Code Charts\P1801.
Is the Inspection result normal?
YES >> GO TO 9.
NO >> Replace VIAS control solenoid valve 2.
9.CHECK INTERMITTENT INCIDENT
Refer to See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Service Information For Electrical Incident\Intermittent Incident.
>> Inspection END