Diagnosis Procedure

VARIABLE INDUCTION AIR SYSTEM


Diagnosis Procedure

1. INSPECTION START
Confirm the malfunctioning system (power valve 1 or power valve 2). Refer to 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.





Without CONSULT-III
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. When revving engine up to 5,000 rpm quickly.
5. Check vacuum existence under the following conditions.





Is the inspection result normal?
YES - Repair or replace power valve actuator 1.
NO - GO TO 3.
3. CHECK VACUUM TANK
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 System Description.
Is the inspection result normal?
YES - GO TO 5.
NO - Repair hoses or tubes.
5. CHECK VIAS CONTROL SOLENOID VALVE 1
Refer to 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.





Without CONSULT-III
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. When revving engine up to 5,000 rpm quickly.
5. Check vacuum existence under the following conditions.





Is the inspection result normal?
YES - Repair or replace power valve actuator 2.
NO - GO TO 7.
7. CHECK VACUUM HOSE
1. Stop engine.





2. Check vacuum hose for cracks, clogging, improper connection or disconnection. Refer to System Description.
Is the inspection result normal?
YES - GO TO 8.
NO - Repair hoses or tubes.
8. CHECK VIAS CONTROL SOLENOID VALVE 2
Refer to P1801.
Is the inspection result normal?
YES - GO TO 9.
NO - Replace VIAS control solenoid valve 2.
9. CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
INSPECTION END